first

node_modules/eslint/lib/api.js

@@ -0,0 +1,34 @@
+/**
+ * @fileoverview Expose out ESLint and CLI to require.
+ * @author Ian Christian Myers
+ */
+
+"use strict";
+
+const { CLIEngine } = require("./cli-engine");
+const { ESLint } = require("./eslint");
+const { Linter } = require("./linter");
+const { RuleTester } = require("./rule-tester");
+const { SourceCode } = require("./source-code");
+
+module.exports = {
+    Linter,
+    CLIEngine,
+    ESLint,
+    RuleTester,
+    SourceCode
+};
+
+// DOTO: remove deprecated API.
+let deprecatedLinterInstance = null;
+
+Object.defineProperty(module.exports, "linter", {
+    enumerable: false,
+    get() {
+        if (!deprecatedLinterInstance) {
+            deprecatedLinterInstance = new Linter();
+        }
+
+        return deprecatedLinterInstance;
+    }
+});

node_modules/eslint/lib/cli-engine/file-enumerator.js

@@ -0,0 +1,542 @@
+/**
+ * @fileoverview `FileEnumerator` class.
+ *
+ * `FileEnumerator` class has two responsibilities:
+ *
+ * 1. Find target files by processing glob patterns.
+ * 2. Tie each target file and appropriate configuration.
+ *
+ * It provides a method:
+ *
+ * - `iterateFiles(patterns)`
+ *     Iterate files which are matched by given patterns together with the
+ *     corresponded configuration. This is for `CLIEngine#executeOnFiles()`.
+ *     While iterating files, it loads the configuration file of each directory
+ *     before iterate files on the directory, so we can use the configuration
+ *     files to determine target files.
+ *
+ * @example
+ * const enumerator = new FileEnumerator();
+ * const linter = new Linter();
+ *
+ * for (const { config, filePath } of enumerator.iterateFiles(["*.js"])) {
+ *     const code = fs.readFileSync(filePath, "utf8");
+ *     const messages = linter.verify(code, config, filePath);
+ *
+ *     console.log(messages);
+ * }
+ *
+ * @author Toru Nagashima <https://github.com/mysticatea>
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const fs = require("fs");
+const path = require("path");
+const getGlobParent = require("glob-parent");
+const isGlob = require("is-glob");
+const escapeRegExp = require("escape-string-regexp");
+const { Minimatch } = require("minimatch");
+
+const {
+    Legacy: {
+        IgnorePattern,
+        CascadingConfigArrayFactory
+    }
+} = require("@eslint/eslintrc");
+const debug = require("debug")("eslint:file-enumerator");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+const minimatchOpts = { dot: true, matchBase: true };
+const dotfilesPattern = /(?:(?:^\.)|(?:[/\\]\.))[^/\\.].*/u;
+const NONE = 0;
+const IGNORED_SILENTLY = 1;
+const IGNORED = 2;
+
+// For VSCode intellisense
+/** @typedef {ReturnType<CascadingConfigArrayFactory["getConfigArrayForFile"]>} ConfigArray */
+
+/**
+ * @typedef {Object} FileEnumeratorOptions
+ * @property {CascadingConfigArrayFactory} [configArrayFactory] The factory for config arrays.
+ * @property {string} [cwd] The base directory to start lookup.
+ * @property {string[]} [extensions] The extensions to match files for directory patterns.
+ * @property {boolean} [globInputPaths] Set to false to skip glob resolution of input file paths to lint (default: true). If false, each input file paths is assumed to be a non-glob path to an existing file.
+ * @property {boolean} [ignore] The flag to check ignored files.
+ * @property {string[]} [rulePaths] The value of `--rulesdir` option.
+ */
+
+/**
+ * @typedef {Object} FileAndConfig
+ * @property {string} filePath The path to a target file.
+ * @property {ConfigArray} config The config entries of that file.
+ * @property {boolean} ignored If `true` then this file should be ignored and warned because it was directly specified.
+ */
+
+/**
+ * @typedef {Object} FileEntry
+ * @property {string} filePath The path to a target file.
+ * @property {ConfigArray} config The config entries of that file.
+ * @property {NONE|IGNORED_SILENTLY|IGNORED} flag The flag.
+ * - `NONE` means the file is a target file.
+ * - `IGNORED_SILENTLY` means the file should be ignored silently.
+ * - `IGNORED` means the file should be ignored and warned because it was directly specified.
+ */
+
+/**
+ * @typedef {Object} FileEnumeratorInternalSlots
+ * @property {CascadingConfigArrayFactory} configArrayFactory The factory for config arrays.
+ * @property {string} cwd The base directory to start lookup.
+ * @property {RegExp|null} extensionRegExp The RegExp to test if a string ends with specific file extensions.
+ * @property {boolean} globInputPaths Set to false to skip glob resolution of input file paths to lint (default: true). If false, each input file paths is assumed to be a non-glob path to an existing file.
+ * @property {boolean} ignoreFlag The flag to check ignored files.
+ * @property {(filePath:string, dot:boolean) => boolean} defaultIgnores The default predicate function to ignore files.
+ */
+
+/** @type {WeakMap<FileEnumerator, FileEnumeratorInternalSlots>} */
+const internalSlotsMap = new WeakMap();
+
+/**
+ * Check if a string is a glob pattern or not.
+ * @param {string} pattern A glob pattern.
+ * @returns {boolean} `true` if the string is a glob pattern.
+ */
+function isGlobPattern(pattern) {
+    return isGlob(path.sep === "\\" ? pattern.replace(/\\/gu, "/") : pattern);
+}
+
+/**
+ * Get stats of a given path.
+ * @param {string} filePath The path to target file.
+ * @returns {fs.Stats|null} The stats.
+ * @private
+ */
+function statSafeSync(filePath) {
+    try {
+        return fs.statSync(filePath);
+    } catch (error) {
+        /* istanbul ignore next */
+        if (error.code !== "ENOENT") {
+            throw error;
+        }
+        return null;
+    }
+}
+
+/**
+ * Get filenames in a given path to a directory.
+ * @param {string} directoryPath The path to target directory.
+ * @returns {import("fs").Dirent[]} The filenames.
+ * @private
+ */
+function readdirSafeSync(directoryPath) {
+    try {
+        return fs.readdirSync(directoryPath, { withFileTypes: true });
+    } catch (error) {
+        /* istanbul ignore next */
+        if (error.code !== "ENOENT") {
+            throw error;
+        }
+        return [];
+    }
+}
+
+/**
+ * Create a `RegExp` object to detect extensions.
+ * @param {string[] | null} extensions The extensions to create.
+ * @returns {RegExp | null} The created `RegExp` object or null.
+ */
+function createExtensionRegExp(extensions) {
+    if (extensions) {
+        const normalizedExts = extensions.map(ext => escapeRegExp(
+            ext.startsWith(".")
+                ? ext.slice(1)
+                : ext
+        ));
+
+        return new RegExp(
+            `.\\.(?:${normalizedExts.join("|")})$`,
+            "u"
+        );
+    }
+    return null;
+}
+
+/**
+ * The error type when no files match a glob.
+ */
+class NoFilesFoundError extends Error {
+
+    // eslint-disable-next-line jsdoc/require-description
+    /**
+     * @param {string} pattern The glob pattern which was not found.
+     * @param {boolean} globDisabled If `true` then the pattern was a glob pattern, but glob was disabled.
+     */
+    constructor(pattern, globDisabled) {
+        super(`No files matching '${pattern}' were found${globDisabled ? " (glob was disabled)" : ""}.`);
+        this.messageTemplate = "file-not-found";
+        this.messageData = { pattern, globDisabled };
+    }
+}
+
+/**
+ * The error type when there are files matched by a glob, but all of them have been ignored.
+ */
+class AllFilesIgnoredError extends Error {
+
+    // eslint-disable-next-line jsdoc/require-description
+    /**
+     * @param {string} pattern The glob pattern which was not found.
+     */
+    constructor(pattern) {
+        super(`All files matched by '${pattern}' are ignored.`);
+        this.messageTemplate = "all-files-ignored";
+        this.messageData = { pattern };
+    }
+}
+
+/**
+ * This class provides the functionality that enumerates every file which is
+ * matched by given glob patterns and that configuration.
+ */
+class FileEnumerator {
+
+    /**
+     * Initialize this enumerator.
+     * @param {FileEnumeratorOptions} options The options.
+     */
+    constructor({
+        cwd = process.cwd(),
+        configArrayFactory = new CascadingConfigArrayFactory({
+            cwd,
+            eslintRecommendedPath: path.resolve(__dirname, "../../conf/eslint-recommended.js"),
+            eslintAllPath: path.resolve(__dirname, "../../conf/eslint-all.js")
+        }),
+        extensions = null,
+        globInputPaths = true,
+        errorOnUnmatchedPattern = true,
+        ignore = true
+    } = {}) {
+        internalSlotsMap.set(this, {
+            configArrayFactory,
+            cwd,
+            defaultIgnores: IgnorePattern.createDefaultIgnore(cwd),
+            extensionRegExp: createExtensionRegExp(extensions),
+            globInputPaths,
+            errorOnUnmatchedPattern,
+            ignoreFlag: ignore
+        });
+    }
+
+    /**
+     * Check if a given file is target or not.
+     * @param {string} filePath The path to a candidate file.
+     * @param {ConfigArray} [providedConfig] Optional. The configuration for the file.
+     * @returns {boolean} `true` if the file is a target.
+     */
+    isTargetPath(filePath, providedConfig) {
+        const {
+            configArrayFactory,
+            extensionRegExp
+        } = internalSlotsMap.get(this);
+
+        // If `--ext` option is present, use it.
+        if (extensionRegExp) {
+            return extensionRegExp.test(filePath);
+        }
+
+        // `.js` file is target by default.
+        if (filePath.endsWith(".js")) {
+            return true;
+        }
+
+        // use `overrides[].files` to check additional targets.
+        const config =
+            providedConfig ||
+            configArrayFactory.getConfigArrayForFile(
+                filePath,
+                { ignoreNotFoundError: true }
+            );
+
+        return config.isAdditionalTargetPath(filePath);
+    }
+
+    /**
+     * Iterate files which are matched by given glob patterns.
+     * @param {string|string[]} patternOrPatterns The glob patterns to iterate files.
+     * @returns {IterableIterator<FileAndConfig>} The found files.
+     */
+    *iterateFiles(patternOrPatterns) {
+        const { globInputPaths, errorOnUnmatchedPattern } = internalSlotsMap.get(this);
+        const patterns = Array.isArray(patternOrPatterns)
+            ? patternOrPatterns
+            : [patternOrPatterns];
+
+        debug("Start to iterate files: %o", patterns);
+
+        // The set of paths to remove duplicate.
+        const set = new Set();
+
+        for (const pattern of patterns) {
+            let foundRegardlessOfIgnored = false;
+            let found = false;
+
+            // Skip empty string.
+            if (!pattern) {
+                continue;
+            }
+
+            // Iterate files of this pattern.
+            for (const { config, filePath, flag } of this._iterateFiles(pattern)) {
+                foundRegardlessOfIgnored = true;
+                if (flag === IGNORED_SILENTLY) {
+                    continue;
+                }
+                found = true;
+
+                // Remove duplicate paths while yielding paths.
+                if (!set.has(filePath)) {
+                    set.add(filePath);
+                    yield {
+                        config,
+                        filePath,
+                        ignored: flag === IGNORED
+                    };
+                }
+            }
+
+            // Raise an error if any files were not found.
+            if (errorOnUnmatchedPattern) {
+                if (!foundRegardlessOfIgnored) {
+                    throw new NoFilesFoundError(
+                        pattern,
+                        !globInputPaths && isGlob(pattern)
+                    );
+                }
+                if (!found) {
+                    throw new AllFilesIgnoredError(pattern);
+                }
+            }
+        }
+
+        debug(`Complete iterating files: ${JSON.stringify(patterns)}`);
+    }
+
+    /**
+     * Iterate files which are matched by a given glob pattern.
+     * @param {string} pattern The glob pattern to iterate files.
+     * @returns {IterableIterator<FileEntry>} The found files.
+     */
+    _iterateFiles(pattern) {
+        const { cwd, globInputPaths } = internalSlotsMap.get(this);
+        const absolutePath = path.resolve(cwd, pattern);
+        const isDot = dotfilesPattern.test(pattern);
+        const stat = statSafeSync(absolutePath);
+
+        if (stat && stat.isDirectory()) {
+            return this._iterateFilesWithDirectory(absolutePath, isDot);
+        }
+        if (stat && stat.isFile()) {
+            return this._iterateFilesWithFile(absolutePath);
+        }
+        if (globInputPaths && isGlobPattern(pattern)) {
+            return this._iterateFilesWithGlob(absolutePath, isDot);
+        }
+
+        return [];
+    }
+
+    /**
+     * Iterate a file which is matched by a given path.
+     * @param {string} filePath The path to the target file.
+     * @returns {IterableIterator<FileEntry>} The found files.
+     * @private
+     */
+    _iterateFilesWithFile(filePath) {
+        debug(`File: ${filePath}`);
+
+        const { configArrayFactory } = internalSlotsMap.get(this);
+        const config = configArrayFactory.getConfigArrayForFile(filePath);
+        const ignored = this._isIgnoredFile(filePath, { config, direct: true });
+        const flag = ignored ? IGNORED : NONE;
+
+        return [{ config, filePath, flag }];
+    }
+
+    /**
+     * Iterate files in a given path.
+     * @param {string} directoryPath The path to the target directory.
+     * @param {boolean} dotfiles If `true` then it doesn't skip dot files by default.
+     * @returns {IterableIterator<FileEntry>} The found files.
+     * @private
+     */
+    _iterateFilesWithDirectory(directoryPath, dotfiles) {
+        debug(`Directory: ${directoryPath}`);
+
+        return this._iterateFilesRecursive(
+            directoryPath,
+            { dotfiles, recursive: true, selector: null }
+        );
+    }
+
+    /**
+     * Iterate files which are matched by a given glob pattern.
+     * @param {string} pattern The glob pattern to iterate files.
+     * @param {boolean} dotfiles If `true` then it doesn't skip dot files by default.
+     * @returns {IterableIterator<FileEntry>} The found files.
+     * @private
+     */
+    _iterateFilesWithGlob(pattern, dotfiles) {
+        debug(`Glob: ${pattern}`);
+
+        const directoryPath = path.resolve(getGlobParent(pattern));
+        const globPart = pattern.slice(directoryPath.length + 1);
+
+        /*
+         * recursive if there are `**` or path separators in the glob part.
+         * Otherwise, patterns such as `src/*.js`, it doesn't need recursive.
+         */
+        const recursive = /\*\*|\/|\\/u.test(globPart);
+        const selector = new Minimatch(pattern, minimatchOpts);
+
+        debug(`recursive? ${recursive}`);
+
+        return this._iterateFilesRecursive(
+            directoryPath,
+            { dotfiles, recursive, selector }
+        );
+    }
+
+    /**
+     * Iterate files in a given path.
+     * @param {string} directoryPath The path to the target directory.
+     * @param {Object} options The options to iterate files.
+     * @param {boolean} [options.dotfiles] If `true` then it doesn't skip dot files by default.
+     * @param {boolean} [options.recursive] If `true` then it dives into sub directories.
+     * @param {InstanceType<Minimatch>} [options.selector] The matcher to choose files.
+     * @returns {IterableIterator<FileEntry>} The found files.
+     * @private
+     */
+    *_iterateFilesRecursive(directoryPath, options) {
+        debug(`Enter the directory: ${directoryPath}`);
+        const { configArrayFactory } = internalSlotsMap.get(this);
+
+        /** @type {ConfigArray|null} */
+        let config = null;
+
+        // Enumerate the files of this directory.
+        for (const entry of readdirSafeSync(directoryPath)) {
+            const filePath = path.join(directoryPath, entry.name);
+            const fileInfo = entry.isSymbolicLink() ? statSafeSync(filePath) : entry;
+
+            if (!fileInfo) {
+                continue;
+            }
+
+            // Check if the file is matched.
+            if (fileInfo.isFile()) {
+                if (!config) {
+                    config = configArrayFactory.getConfigArrayForFile(
+                        filePath,
+
+                        /*
+                         * We must ignore `ConfigurationNotFoundError` at this
+                         * point because we don't know if target files exist in
+                         * this directory.
+                         */
+                        { ignoreNotFoundError: true }
+                    );
+                }
+                const matched = options.selector
+
+                    // Started with a glob pattern; choose by the pattern.
+                    ? options.selector.match(filePath)
+
+                    // Started with a directory path; choose by file extensions.
+                    : this.isTargetPath(filePath, config);
+
+                if (matched) {
+                    const ignored = this._isIgnoredFile(filePath, { ...options, config });
+                    const flag = ignored ? IGNORED_SILENTLY : NONE;
+
+                    debug(`Yield: ${entry.name}${ignored ? " but ignored" : ""}`);
+                    yield {
+                        config: configArrayFactory.getConfigArrayForFile(filePath),
+                        filePath,
+                        flag
+                    };
+                } else {
+                    debug(`Didn't match: ${entry.name}`);
+                }
+
+            // Dive into the sub directory.
+            } else if (options.recursive && fileInfo.isDirectory()) {
+                if (!config) {
+                    config = configArrayFactory.getConfigArrayForFile(
+                        filePath,
+                        { ignoreNotFoundError: true }
+                    );
+                }
+                const ignored = this._isIgnoredFile(
+                    filePath + path.sep,
+                    { ...options, config }
+                );
+
+                if (!ignored) {
+                    yield* this._iterateFilesRecursive(filePath, options);
+                }
+            }
+        }
+
+        debug(`Leave the directory: ${directoryPath}`);
+    }
+
+    /**
+     * Check if a given file should be ignored.
+     * @param {string} filePath The path to a file to check.
+     * @param {Object} options Options
+     * @param {ConfigArray} [options.config] The config for this file.
+     * @param {boolean} [options.dotfiles] If `true` then this is not ignore dot files by default.
+     * @param {boolean} [options.direct] If `true` then this is a direct specified file.
+     * @returns {boolean} `true` if the file should be ignored.
+     * @private
+     */
+    _isIgnoredFile(filePath, {
+        config: providedConfig,
+        dotfiles = false,
+        direct = false
+    }) {
+        const {
+            configArrayFactory,
+            defaultIgnores,
+            ignoreFlag
+        } = internalSlotsMap.get(this);
+
+        if (ignoreFlag) {
+            const config =
+                providedConfig ||
+                configArrayFactory.getConfigArrayForFile(
+                    filePath,
+                    { ignoreNotFoundError: true }
+                );
+            const ignores =
+                config.extractConfig(filePath).ignores || defaultIgnores;
+
+            return ignores(filePath, dotfiles);
+        }
+
+        return !direct && defaultIgnores(filePath, dotfiles);
+    }
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = { FileEnumerator };

node_modules/eslint/lib/cli-engine/formatters/checkstyle.js

@@ -0,0 +1,60 @@
+/**
+ * @fileoverview CheckStyle XML reporter
+ * @author Ian Christian Myers
+ */
+"use strict";
+
+const xmlEscape = require("../xml-escape");
+
+//------------------------------------------------------------------------------
+// Helper Functions
+//------------------------------------------------------------------------------
+
+/**
+ * Returns the severity of warning or error
+ * @param {Object} message message object to examine
+ * @returns {string} severity level
+ * @private
+ */
+function getMessageType(message) {
+    if (message.fatal || message.severity === 2) {
+        return "error";
+    }
+    return "warning";
+
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = function(results) {
+
+    let output = "";
+
+    output += "<?xml version=\"1.0\" encoding=\"utf-8\"?>";
+    output += "<checkstyle version=\"4.3\">";
+
+    results.forEach(result => {
+        const messages = result.messages;
+
+        output += `<file name="${xmlEscape(result.filePath)}">`;
+
+        messages.forEach(message => {
+            output += [
+                `<error line="${xmlEscape(message.line || 0)}"`,
+                `column="${xmlEscape(message.column || 0)}"`,
+                `severity="${xmlEscape(getMessageType(message))}"`,
+                `message="${xmlEscape(message.message)}${message.ruleId ? ` (${message.ruleId})` : ""}"`,
+                `source="${message.ruleId ? xmlEscape(`eslint.rules.${message.ruleId}`) : ""}" />`
+            ].join(" ");
+        });
+
+        output += "</file>";
+
+    });
+
+    output += "</checkstyle>";
+
+    return output;
+};

node_modules/eslint/lib/cli-engine/formatters/codeframe.js

@@ -0,0 +1,138 @@
+/**
+ * @fileoverview Codeframe reporter
+ * @author Vitor Balocco
+ */
+"use strict";
+
+const chalk = require("chalk");
+const { codeFrameColumns } = require("@babel/code-frame");
+const path = require("path");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Given a word and a count, append an s if count is not one.
+ * @param   {string} word  A word in its singular form.
+ * @param   {number} count A number controlling whether word should be pluralized.
+ * @returns {string}       The original word with an s on the end if count is not one.
+ */
+function pluralize(word, count) {
+    return (count === 1 ? word : `${word}s`);
+}
+
+/**
+ * Gets a formatted relative file path from an absolute path and a line/column in the file.
+ * @param   {string} filePath The absolute file path to format.
+ * @param   {number} line     The line from the file to use for formatting.
+ * @param   {number} column   The column from the file to use for formatting.
+ * @returns {string}          The formatted file path.
+ */
+function formatFilePath(filePath, line, column) {
+    let relPath = path.relative(process.cwd(), filePath);
+
+    if (line && column) {
+        relPath += `:${line}:${column}`;
+    }
+
+    return chalk.green(relPath);
+}
+
+/**
+ * Gets the formatted output for a given message.
+ * @param   {Object} message      The object that represents this message.
+ * @param   {Object} parentResult The result object that this message belongs to.
+ * @returns {string}              The formatted output.
+ */
+function formatMessage(message, parentResult) {
+    const type = (message.fatal || message.severity === 2) ? chalk.red("error") : chalk.yellow("warning");
+    const msg = `${chalk.bold(message.message.replace(/([^ ])\.$/u, "$1"))}`;
+    const ruleId = message.fatal ? "" : chalk.dim(`(${message.ruleId})`);
+    const filePath = formatFilePath(parentResult.filePath, message.line, message.column);
+    const sourceCode = parentResult.output ? parentResult.output : parentResult.source;
+
+    const firstLine = [
+        `${type}:`,
+        `${msg}`,
+        ruleId ? `${ruleId}` : "",
+        sourceCode ? `at ${filePath}:` : `at ${filePath}`
+    ].filter(String).join(" ");
+
+    const result = [firstLine];
+
+    if (sourceCode) {
+        result.push(
+            codeFrameColumns(sourceCode, { start: { line: message.line, column: message.column } }, { highlightCode: false })
+        );
+    }
+
+    return result.join("\n");
+}
+
+/**
+ * Gets the formatted output summary for a given number of errors and warnings.
+ * @param   {number} errors   The number of errors.
+ * @param   {number} warnings The number of warnings.
+ * @param   {number} fixableErrors The number of fixable errors.
+ * @param   {number} fixableWarnings The number of fixable warnings.
+ * @returns {string}          The formatted output summary.
+ */
+function formatSummary(errors, warnings, fixableErrors, fixableWarnings) {
+    const summaryColor = errors > 0 ? "red" : "yellow";
+    const summary = [];
+    const fixablesSummary = [];
+
+    if (errors > 0) {
+        summary.push(`${errors} ${pluralize("error", errors)}`);
+    }
+
+    if (warnings > 0) {
+        summary.push(`${warnings} ${pluralize("warning", warnings)}`);
+    }
+
+    if (fixableErrors > 0) {
+        fixablesSummary.push(`${fixableErrors} ${pluralize("error", fixableErrors)}`);
+    }
+
+    if (fixableWarnings > 0) {
+        fixablesSummary.push(`${fixableWarnings} ${pluralize("warning", fixableWarnings)}`);
+    }
+
+    let output = chalk[summaryColor].bold(`${summary.join(" and ")} found.`);
+
+    if (fixableErrors || fixableWarnings) {
+        output += chalk[summaryColor].bold(`\n${fixablesSummary.join(" and ")} potentially fixable with the \`--fix\` option.`);
+    }
+
+    return output;
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = function(results) {
+    let errors = 0;
+    let warnings = 0;
+    let fixableErrors = 0;
+    let fixableWarnings = 0;
+
+    const resultsWithMessages = results.filter(result => result.messages.length > 0);
+
+    let output = resultsWithMessages.reduce((resultsOutput, result) => {
+        const messages = result.messages.map(message => `${formatMessage(message, result)}\n\n`);
+
+        errors += result.errorCount;
+        warnings += result.warningCount;
+        fixableErrors += result.fixableErrorCount;
+        fixableWarnings += result.fixableWarningCount;
+
+        return resultsOutput.concat(messages);
+    }, []).join("\n");
+
+    output += "\n";
+    output += formatSummary(errors, warnings, fixableErrors, fixableWarnings);
+
+    return (errors + warnings) > 0 ? output : "";
+};

node_modules/eslint/lib/cli-engine/formatters/compact.js

@@ -0,0 +1,60 @@
+/**
+ * @fileoverview Compact reporter
+ * @author Nicholas C. Zakas
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Helper Functions
+//------------------------------------------------------------------------------
+
+/**
+ * Returns the severity of warning or error
+ * @param {Object} message message object to examine
+ * @returns {string} severity level
+ * @private
+ */
+function getMessageType(message) {
+    if (message.fatal || message.severity === 2) {
+        return "Error";
+    }
+    return "Warning";
+
+}
+
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = function(results) {
+
+    let output = "",
+        total = 0;
+
+    results.forEach(result => {
+
+        const messages = result.messages;
+
+        total += messages.length;
+
+        messages.forEach(message => {
+
+            output += `${result.filePath}: `;
+            output += `line ${message.line || 0}`;
+            output += `, col ${message.column || 0}`;
+            output += `, ${getMessageType(message)}`;
+            output += ` - ${message.message}`;
+            output += message.ruleId ? ` (${message.ruleId})` : "";
+            output += "\n";
+
+        });
+
+    });
+
+    if (total > 0) {
+        output += `\n${total} problem${total !== 1 ? "s" : ""}`;
+    }
+
+    return output;
+};

node_modules/eslint/lib/cli-engine/formatters/html.js

@@ -0,0 +1,324 @@
+/**
+ * @fileoverview HTML reporter
+ * @author Julian Laval
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+const encodeHTML = (function() {
+    const encodeHTMLRules = {
+        "&": "&",
+        "<": "&#60;",
+        ">": "&#62;",
+        '"': "&#34;",
+        "'": "&#39;"
+    };
+    const matchHTML = /[&<>"']/ug;
+
+    return function(code) {
+        return code
+            ? code.toString().replace(matchHTML, m => encodeHTMLRules[m] || m)
+            : "";
+    };
+}());
+
+/**
+ * Get the final HTML document.
+ * @param {Object} it data for the document.
+ * @returns {string} HTML document.
+ */
+function pageTemplate(it) {
+    const { reportColor, reportSummary, date, results } = it;
+
+    return `
+<!DOCTYPE html>
+<html>
+    <head>
+        <meta charset="UTF-8">
+        <title>ESLint Report</title>
+        <style>
+            body {
+                font-family:Arial, "Helvetica Neue", Helvetica, sans-serif;
+                font-size:16px;
+                font-weight:normal;
+                margin:0;
+                padding:0;
+                color:#333
+            }
+            #overview {
+                padding:20px 30px
+            }
+            td, th {
+                padding:5px 10px
+            }
+            h1 {
+                margin:0
+            }
+            table {
+                margin:30px;
+                width:calc(100% - 60px);
+                max-width:1000px;
+                border-radius:5px;
+                border:1px solid #ddd;
+                border-spacing:0px;
+            }
+            th {
+                font-weight:400;
+                font-size:medium;
+                text-align:left;
+                cursor:pointer
+            }
+            td.clr-1, td.clr-2, th span {
+                font-weight:700
+            }
+            th span {
+                float:right;
+                margin-left:20px
+            }
+            th span:after {
+                content:"";
+                clear:both;
+                display:block
+            }
+            tr:last-child td {
+                border-bottom:none
+            }
+            tr td:first-child, tr td:last-child {
+                color:#9da0a4
+            }
+            #overview.bg-0, tr.bg-0 th {
+                color:#468847;
+                background:#dff0d8;
+                border-bottom:1px solid #d6e9c6
+            }
+            #overview.bg-1, tr.bg-1 th {
+                color:#f0ad4e;
+                background:#fcf8e3;
+                border-bottom:1px solid #fbeed5
+            }
+            #overview.bg-2, tr.bg-2 th {
+                color:#b94a48;
+                background:#f2dede;
+                border-bottom:1px solid #eed3d7
+            }
+            td {
+                border-bottom:1px solid #ddd
+            }
+            td.clr-1 {
+                color:#f0ad4e
+            }
+            td.clr-2 {
+                color:#b94a48
+            }
+            td a {
+                color:#3a33d1;
+                text-decoration:none
+            }
+            td a:hover {
+                color:#272296;
+                text-decoration:underline
+            }
+        </style>
+    </head>
+    <body>
+        <div id="overview" class="bg-${reportColor}">
+            <h1>ESLint Report</h1>
+            <div>
+                <span>${reportSummary}</span> - Generated on ${date}
+            </div>
+        </div>
+        <table>
+            <tbody>
+                ${results}
+            </tbody>
+        </table>
+        <script type="text/javascript">
+            var groups = document.querySelectorAll("tr[data-group]");
+            for (i = 0; i < groups.length; i++) {
+                groups[i].addEventListener("click", function() {
+                    var inGroup = document.getElementsByClassName(this.getAttribute("data-group"));
+                    this.innerHTML = (this.innerHTML.indexOf("+") > -1) ? this.innerHTML.replace("+", "-") : this.innerHTML.replace("-", "+");
+                    for (var j = 0; j < inGroup.length; j++) {
+                        inGroup[j].style.display = (inGroup[j].style.display !== "none") ? "none" : "table-row";
+                    }
+                });
+            }
+        </script>
+    </body>
+</html>
+`.trimLeft();
+}
+
+/**
+ * Given a word and a count, append an s if count is not one.
+ * @param {string} word A word in its singular form.
+ * @param {int} count A number controlling whether word should be pluralized.
+ * @returns {string} The original word with an s on the end if count is not one.
+ */
+function pluralize(word, count) {
+    return (count === 1 ? word : `${word}s`);
+}
+
+/**
+ * Renders text along the template of x problems (x errors, x warnings)
+ * @param {string} totalErrors Total errors
+ * @param {string} totalWarnings Total warnings
+ * @returns {string} The formatted string, pluralized where necessary
+ */
+function renderSummary(totalErrors, totalWarnings) {
+    const totalProblems = totalErrors + totalWarnings;
+    let renderedText = `${totalProblems} ${pluralize("problem", totalProblems)}`;
+
+    if (totalProblems !== 0) {
+        renderedText += ` (${totalErrors} ${pluralize("error", totalErrors)}, ${totalWarnings} ${pluralize("warning", totalWarnings)})`;
+    }
+    return renderedText;
+}
+
+/**
+ * Get the color based on whether there are errors/warnings...
+ * @param {string} totalErrors Total errors
+ * @param {string} totalWarnings Total warnings
+ * @returns {int} The color code (0 = green, 1 = yellow, 2 = red)
+ */
+function renderColor(totalErrors, totalWarnings) {
+    if (totalErrors !== 0) {
+        return 2;
+    }
+    if (totalWarnings !== 0) {
+        return 1;
+    }
+    return 0;
+}
+
+/**
+ * Get HTML (table row) describing a single message.
+ * @param {Object} it data for the message.
+ * @returns {string} HTML (table row) describing the message.
+ */
+function messageTemplate(it) {
+    const {
+        parentIndex,
+        lineNumber,
+        columnNumber,
+        severityNumber,
+        severityName,
+        message,
+        ruleUrl,
+        ruleId
+    } = it;
+
+    return `
+<tr style="display:none" class="f-${parentIndex}">
+    <td>${lineNumber}:${columnNumber}</td>
+    <td class="clr-${severityNumber}">${severityName}</td>
+    <td>${encodeHTML(message)}</td>
+    <td>
+        <a href="${ruleUrl ? ruleUrl : ""}" target="_blank" rel="noopener noreferrer">${ruleId ? ruleId : ""}</a>
+    </td>
+</tr>
+`.trimLeft();
+}
+
+/**
+ * Get HTML (table rows) describing the messages.
+ * @param {Array} messages Messages.
+ * @param {int} parentIndex Index of the parent HTML row.
+ * @param {Object} rulesMeta Dictionary containing metadata for each rule executed by the analysis.
+ * @returns {string} HTML (table rows) describing the messages.
+ */
+function renderMessages(messages, parentIndex, rulesMeta) {
+
+    /**
+     * Get HTML (table row) describing a message.
+     * @param {Object} message Message.
+     * @returns {string} HTML (table row) describing a message.
+     */
+    return messages.map(message => {
+        const lineNumber = message.line || 0;
+        const columnNumber = message.column || 0;
+        let ruleUrl;
+
+        if (rulesMeta) {
+            const meta = rulesMeta[message.ruleId];
+
+            if (meta && meta.docs && meta.docs.url) {
+                ruleUrl = meta.docs.url;
+            }
+        }
+
+        return messageTemplate({
+            parentIndex,
+            lineNumber,
+            columnNumber,
+            severityNumber: message.severity,
+            severityName: message.severity === 1 ? "Warning" : "Error",
+            message: message.message,
+            ruleId: message.ruleId,
+            ruleUrl
+        });
+    }).join("\n");
+}
+
+/**
+ * Get HTML (table row) describing the result for a single file.
+ * @param {Object} it data for the file.
+ * @returns {string} HTML (table row) describing the result for the file.
+ */
+function resultTemplate(it) {
+    const { color, index, filePath, summary } = it;
+
+    return `
+<tr class="bg-${color}" data-group="f-${index}">
+    <th colspan="4">
+        [+] ${encodeHTML(filePath)}
+        <span>${encodeHTML(summary)}</span>
+    </th>
+</tr>
+`.trimLeft();
+}
+
+// eslint-disable-next-line jsdoc/require-description
+/**
+ * @param {Array} results Test results.
+ * @param {Object} rulesMeta Dictionary containing metadata for each rule executed by the analysis.
+ * @returns {string} HTML string describing the results.
+ */
+function renderResults(results, rulesMeta) {
+    return results.map((result, index) => resultTemplate({
+        index,
+        color: renderColor(result.errorCount, result.warningCount),
+        filePath: result.filePath,
+        summary: renderSummary(result.errorCount, result.warningCount)
+    }) + renderMessages(result.messages, index, rulesMeta)).join("\n");
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = function(results, data) {
+    let totalErrors,
+        totalWarnings;
+
+    const metaData = data ? data.rulesMeta : {};
+
+    totalErrors = 0;
+    totalWarnings = 0;
+
+    // Iterate over results to get totals
+    results.forEach(result => {
+        totalErrors += result.errorCount;
+        totalWarnings += result.warningCount;
+    });
+
+    return pageTemplate({
+        date: new Date(),
+        reportColor: renderColor(totalErrors, totalWarnings),
+        reportSummary: renderSummary(totalErrors, totalWarnings),
+        results: renderResults(results, metaData)
+    });
+};

node_modules/eslint/lib/cli-engine/formatters/jslint-xml.js

@@ -0,0 +1,41 @@
+/**
+ * @fileoverview JSLint XML reporter
+ * @author Ian Christian Myers
+ */
+"use strict";
+
+const xmlEscape = require("../xml-escape");
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = function(results) {
+
+    let output = "";
+
+    output += "<?xml version=\"1.0\" encoding=\"utf-8\"?>";
+    output += "<jslint>";
+
+    results.forEach(result => {
+        const messages = result.messages;
+
+        output += `<file name="${result.filePath}">`;
+
+        messages.forEach(message => {
+            output += [
+                `<issue line="${message.line}"`,
+                `char="${message.column}"`,
+                `evidence="${xmlEscape(message.source || "")}"`,
+                `reason="${xmlEscape(message.message || "")}${message.ruleId ? ` (${message.ruleId})` : ""}" />`
+            ].join(" ");
+        });
+
+        output += "</file>";
+
+    });
+
+    output += "</jslint>";
+
+    return output;
+};

node_modules/eslint/lib/cli-engine/formatters/json-with-metadata.js

@@ -0,0 +1,16 @@
+/**
+ * @fileoverview JSON reporter, including rules metadata
+ * @author Chris Meyer
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = function(results, data) {
+    return JSON.stringify({
+        results,
+        metadata: data
+    });
+};

node_modules/eslint/lib/cli-engine/formatters/json.js

@@ -0,0 +1,13 @@
+/**
+ * @fileoverview JSON reporter
+ * @author Burak Yigit Kaya aka BYK
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = function(results) {
+    return JSON.stringify(results);
+};

node_modules/eslint/lib/cli-engine/formatters/junit.js

@@ -0,0 +1,82 @@
+/**
+ * @fileoverview jUnit Reporter
+ * @author Jamund Ferguson
+ */
+"use strict";
+
+const xmlEscape = require("../xml-escape");
+const path = require("path");
+
+//------------------------------------------------------------------------------
+// Helper Functions
+//------------------------------------------------------------------------------
+
+/**
+ * Returns the severity of warning or error
+ * @param {Object} message message object to examine
+ * @returns {string} severity level
+ * @private
+ */
+function getMessageType(message) {
+    if (message.fatal || message.severity === 2) {
+        return "Error";
+    }
+    return "Warning";
+
+}
+
+/**
+ * Returns a full file path without extension
+ * @param {string} filePath input file path
+ * @returns {string} file path without extension
+ * @private
+ */
+function pathWithoutExt(filePath) {
+    return path.join(path.dirname(filePath), path.basename(filePath, path.extname(filePath)));
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = function(results) {
+
+    let output = "";
+
+    output += "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n";
+    output += "<testsuites>\n";
+
+    results.forEach(result => {
+
+        const messages = result.messages;
+        const classname = pathWithoutExt(result.filePath);
+
+        if (messages.length > 0) {
+            output += `<testsuite package="org.eslint" time="0" tests="${messages.length}" errors="${messages.length}" name="${result.filePath}">\n`;
+            messages.forEach(message => {
+                const type = message.fatal ? "error" : "failure";
+
+                output += `<testcase time="0" name="org.eslint.${message.ruleId || "unknown"}" classname="${classname}">`;
+                output += `<${type} message="${xmlEscape(message.message || "")}">`;
+                output += "<![CDATA[";
+                output += `line ${message.line || 0}, col `;
+                output += `${message.column || 0}, ${getMessageType(message)}`;
+                output += ` - ${xmlEscape(message.message || "")}`;
+                output += (message.ruleId ? ` (${message.ruleId})` : "");
+                output += "]]>";
+                output += `</${type}>`;
+                output += "</testcase>\n";
+            });
+            output += "</testsuite>\n";
+        } else {
+            output += `<testsuite package="org.eslint" time="0" tests="1" errors="0" name="${result.filePath}">\n`;
+            output += `<testcase time="0" name="${result.filePath}" classname="${classname}" />\n`;
+            output += "</testsuite>\n";
+        }
+
+    });
+
+    output += "</testsuites>\n";
+
+    return output;
+};

node_modules/eslint/lib/cli-engine/formatters/stylish.js

@@ -0,0 +1,101 @@
+/**
+ * @fileoverview Stylish reporter
+ * @author Sindre Sorhus
+ */
+"use strict";
+
+const chalk = require("chalk"),
+    stripAnsi = require("strip-ansi"),
+    table = require("text-table");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Given a word and a count, append an s if count is not one.
+ * @param {string} word A word in its singular form.
+ * @param {int} count A number controlling whether word should be pluralized.
+ * @returns {string} The original word with an s on the end if count is not one.
+ */
+function pluralize(word, count) {
+    return (count === 1 ? word : `${word}s`);
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = function(results) {
+
+    let output = "\n",
+        errorCount = 0,
+        warningCount = 0,
+        fixableErrorCount = 0,
+        fixableWarningCount = 0,
+        summaryColor = "yellow";
+
+    results.forEach(result => {
+        const messages = result.messages;
+
+        if (messages.length === 0) {
+            return;
+        }
+
+        errorCount += result.errorCount;
+        warningCount += result.warningCount;
+        fixableErrorCount += result.fixableErrorCount;
+        fixableWarningCount += result.fixableWarningCount;
+
+        output += `${chalk.underline(result.filePath)}\n`;
+
+        output += `${table(
+            messages.map(message => {
+                let messageType;
+
+                if (message.fatal || message.severity === 2) {
+                    messageType = chalk.red("error");
+                    summaryColor = "red";
+                } else {
+                    messageType = chalk.yellow("warning");
+                }
+
+                return [
+                    "",
+                    message.line || 0,
+                    message.column || 0,
+                    messageType,
+                    message.message.replace(/([^ ])\.$/u, "$1"),
+                    chalk.dim(message.ruleId || "")
+                ];
+            }),
+            {
+                align: ["", "r", "l"],
+                stringLength(str) {
+                    return stripAnsi(str).length;
+                }
+            }
+        ).split("\n").map(el => el.replace(/(\d+)\s+(\d+)/u, (m, p1, p2) => chalk.dim(`${p1}:${p2}`))).join("\n")}\n\n`;
+    });
+
+    const total = errorCount + warningCount;
+
+    if (total > 0) {
+        output += chalk[summaryColor].bold([
+            "\u2716 ", total, pluralize(" problem", total),
+            " (", errorCount, pluralize(" error", errorCount), ", ",
+            warningCount, pluralize(" warning", warningCount), ")\n"
+        ].join(""));
+
+        if (fixableErrorCount > 0 || fixableWarningCount > 0) {
+            output += chalk[summaryColor].bold([
+                "  ", fixableErrorCount, pluralize(" error", fixableErrorCount), " and ",
+                fixableWarningCount, pluralize(" warning", fixableWarningCount),
+                " potentially fixable with the `--fix` option.\n"
+            ].join(""));
+        }
+    }
+
+    // Resets output color, for prevent change on top level
+    return total > 0 ? chalk.reset(output) : "";
+};

node_modules/eslint/lib/cli-engine/formatters/table.js

@@ -0,0 +1,159 @@
+/**
+ * @fileoverview "table reporter.
+ * @author Gajus Kuizinas <gajus@gajus.com>
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const chalk = require("chalk"),
+    table = require("table").table;
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Given a word and a count, append an "s" if count is not one.
+ * @param {string} word A word.
+ * @param {number} count Quantity.
+ * @returns {string} The original word with an s on the end if count is not one.
+ */
+function pluralize(word, count) {
+    return (count === 1 ? word : `${word}s`);
+}
+
+/**
+ * Draws text table.
+ * @param {Array<Object>} messages Error messages relating to a specific file.
+ * @returns {string} A text table.
+ */
+function drawTable(messages) {
+    const rows = [];
+
+    if (messages.length === 0) {
+        return "";
+    }
+
+    rows.push([
+        chalk.bold("Line"),
+        chalk.bold("Column"),
+        chalk.bold("Type"),
+        chalk.bold("Message"),
+        chalk.bold("Rule ID")
+    ]);
+
+    messages.forEach(message => {
+        let messageType;
+
+        if (message.fatal || message.severity === 2) {
+            messageType = chalk.red("error");
+        } else {
+            messageType = chalk.yellow("warning");
+        }
+
+        rows.push([
+            message.line || 0,
+            message.column || 0,
+            messageType,
+            message.message,
+            message.ruleId || ""
+        ]);
+    });
+
+    return table(rows, {
+        columns: {
+            0: {
+                width: 8,
+                wrapWord: true
+            },
+            1: {
+                width: 8,
+                wrapWord: true
+            },
+            2: {
+                width: 8,
+                wrapWord: true
+            },
+            3: {
+                paddingRight: 5,
+                width: 50,
+                wrapWord: true
+            },
+            4: {
+                width: 20,
+                wrapWord: true
+            }
+        },
+        drawHorizontalLine(index) {
+            return index === 1;
+        }
+    });
+}
+
+/**
+ * Draws a report (multiple tables).
+ * @param {Array} results Report results for every file.
+ * @returns {string} A column of text tables.
+ */
+function drawReport(results) {
+    let files;
+
+    files = results.map(result => {
+        if (!result.messages.length) {
+            return "";
+        }
+
+        return `\n${result.filePath}\n\n${drawTable(result.messages)}`;
+    });
+
+    files = files.filter(content => content.trim());
+
+    return files.join("");
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = function(report) {
+    let result,
+        errorCount,
+        warningCount;
+
+    result = "";
+    errorCount = 0;
+    warningCount = 0;
+
+    report.forEach(fileReport => {
+        errorCount += fileReport.errorCount;
+        warningCount += fileReport.warningCount;
+    });
+
+    if (errorCount || warningCount) {
+        result = drawReport(report);
+    }
+
+    result += `\n${table([
+        [
+            chalk.red(pluralize(`${errorCount} Error`, errorCount))
+        ],
+        [
+            chalk.yellow(pluralize(`${warningCount} Warning`, warningCount))
+        ]
+    ], {
+        columns: {
+            0: {
+                width: 110,
+                wrapWord: true
+            }
+        },
+        drawHorizontalLine() {
+            return true;
+        }
+    })}`;
+
+    return result;
+};

node_modules/eslint/lib/cli-engine/formatters/tap.js

@@ -0,0 +1,95 @@
+/**
+ * @fileoverview TAP reporter
+ * @author Jonathan Kingston
+ */
+"use strict";
+
+const yaml = require("js-yaml");
+
+//------------------------------------------------------------------------------
+// Helper Functions
+//------------------------------------------------------------------------------
+
+/**
+ * Returns a canonical error level string based upon the error message passed in.
+ * @param {Object} message Individual error message provided by eslint
+ * @returns {string} Error level string
+ */
+function getMessageType(message) {
+    if (message.fatal || message.severity === 2) {
+        return "error";
+    }
+    return "warning";
+}
+
+/**
+ * Takes in a JavaScript object and outputs a TAP diagnostics string
+ * @param {Object} diagnostic JavaScript object to be embedded as YAML into output.
+ * @returns {string} diagnostics string with YAML embedded - TAP version 13 compliant
+ */
+function outputDiagnostics(diagnostic) {
+    const prefix = "  ";
+    let output = `${prefix}---\n`;
+
+    output += prefix + yaml.safeDump(diagnostic).split("\n").join(`\n${prefix}`);
+    output += "...\n";
+    return output;
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = function(results) {
+    let output = `TAP version 13\n1..${results.length}\n`;
+
+    results.forEach((result, id) => {
+        const messages = result.messages;
+        let testResult = "ok";
+        let diagnostics = {};
+
+        if (messages.length > 0) {
+            messages.forEach(message => {
+                const severity = getMessageType(message);
+                const diagnostic = {
+                    message: message.message,
+                    severity,
+                    data: {
+                        line: message.line || 0,
+                        column: message.column || 0,
+                        ruleId: message.ruleId || ""
+                    }
+                };
+
+                // This ensures a warning message is not flagged as error
+                if (severity === "error") {
+                    testResult = "not ok";
+                }
+
+                /*
+                 * If we have multiple messages place them under a messages key
+                 * The first error will be logged as message key
+                 * This is to adhere to TAP 13 loosely defined specification of having a message key
+                 */
+                if ("message" in diagnostics) {
+                    if (typeof diagnostics.messages === "undefined") {
+                        diagnostics.messages = [];
+                    }
+                    diagnostics.messages.push(diagnostic);
+                } else {
+                    diagnostics = diagnostic;
+                }
+            });
+        }
+
+        output += `${testResult} ${id + 1} - ${result.filePath}\n`;
+
+        // If we have an error include diagnostics
+        if (messages.length > 0) {
+            output += outputDiagnostics(diagnostics);
+        }
+
+    });
+
+    return output;
+};

node_modules/eslint/lib/cli-engine/formatters/unix.js

@@ -0,0 +1,58 @@
+/**
+ * @fileoverview unix-style formatter.
+ * @author oshi-shinobu
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Helper Functions
+//------------------------------------------------------------------------------
+
+/**
+ * Returns a canonical error level string based upon the error message passed in.
+ * @param {Object} message Individual error message provided by eslint
+ * @returns {string} Error level string
+ */
+function getMessageType(message) {
+    if (message.fatal || message.severity === 2) {
+        return "Error";
+    }
+    return "Warning";
+
+}
+
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = function(results) {
+
+    let output = "",
+        total = 0;
+
+    results.forEach(result => {
+
+        const messages = result.messages;
+
+        total += messages.length;
+
+        messages.forEach(message => {
+
+            output += `${result.filePath}:`;
+            output += `${message.line || 0}:`;
+            output += `${message.column || 0}:`;
+            output += ` ${message.message} `;
+            output += `[${getMessageType(message)}${message.ruleId ? `/${message.ruleId}` : ""}]`;
+            output += "\n";
+
+        });
+
+    });
+
+    if (total > 0) {
+        output += `\n${total} problem${total !== 1 ? "s" : ""}`;
+    }
+
+    return output;
+};

node_modules/eslint/lib/cli-engine/formatters/visualstudio.js

@@ -0,0 +1,63 @@
+/**
+ * @fileoverview Visual Studio compatible formatter
+ * @author Ronald Pijnacker
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Helper Functions
+//------------------------------------------------------------------------------
+
+/**
+ * Returns the severity of warning or error
+ * @param {Object} message message object to examine
+ * @returns {string} severity level
+ * @private
+ */
+function getMessageType(message) {
+    if (message.fatal || message.severity === 2) {
+        return "error";
+    }
+    return "warning";
+
+}
+
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = function(results) {
+
+    let output = "",
+        total = 0;
+
+    results.forEach(result => {
+
+        const messages = result.messages;
+
+        total += messages.length;
+
+        messages.forEach(message => {
+
+            output += result.filePath;
+            output += `(${message.line || 0}`;
+            output += message.column ? `,${message.column}` : "";
+            output += `): ${getMessageType(message)}`;
+            output += message.ruleId ? ` ${message.ruleId}` : "";
+            output += ` : ${message.message}`;
+            output += "\n";
+
+        });
+
+    });
+
+    if (total === 0) {
+        output += "no problems";
+    } else {
+        output += `\n${total} problem${total !== 1 ? "s" : ""}`;
+    }
+
+    return output;
+};

node_modules/eslint/lib/cli-engine/hash.js

@@ -0,0 +1,35 @@
+/**
+ * @fileoverview Defining the hashing function in one place.
+ * @author Michael Ficarra
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const murmur = require("imurmurhash");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+// Private
+//------------------------------------------------------------------------------
+
+/**
+ * hash the given string
+ * @param  {string} str the string to hash
+ * @returns {string}    the hash
+ */
+function hash(str) {
+    return murmur(str).result().toString(36);
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = hash;

node_modules/eslint/lib/cli-engine/index.js

@@ -0,0 +1,7 @@
+"use strict";
+
+const { CLIEngine } = require("./cli-engine");
+
+module.exports = {
+    CLIEngine
+};

node_modules/eslint/lib/cli-engine/lint-result-cache.js

@@ -0,0 +1,191 @@
+/**
+ * @fileoverview Utility for caching lint results.
+ * @author Kevin Partington
+ */
+"use strict";
+
+//-----------------------------------------------------------------------------
+// Requirements
+//-----------------------------------------------------------------------------
+
+const assert = require("assert");
+const fs = require("fs");
+const fileEntryCache = require("file-entry-cache");
+const stringify = require("json-stable-stringify-without-jsonify");
+const pkg = require("../../package.json");
+const hash = require("./hash");
+
+const debug = require("debug")("eslint:lint-result-cache");
+
+//-----------------------------------------------------------------------------
+// Helpers
+//-----------------------------------------------------------------------------
+
+const configHashCache = new WeakMap();
+const nodeVersion = process && process.version;
+
+const validCacheStrategies = ["metadata", "content"];
+const invalidCacheStrategyErrorMessage = `Cache strategy must be one of: ${validCacheStrategies
+    .map(strategy => `"${strategy}"`)
+    .join(", ")}`;
+
+/**
+ * Tests whether a provided cacheStrategy is valid
+ * @param {string} cacheStrategy The cache strategy to use
+ * @returns {boolean} true if `cacheStrategy` is one of `validCacheStrategies`; false otherwise
+ */
+function isValidCacheStrategy(cacheStrategy) {
+    return (
+        validCacheStrategies.indexOf(cacheStrategy) !== -1
+    );
+}
+
+/**
+ * Calculates the hash of the config
+ * @param {ConfigArray} config The config.
+ * @returns {string} The hash of the config
+ */
+function hashOfConfigFor(config) {
+    if (!configHashCache.has(config)) {
+        configHashCache.set(config, hash(`${pkg.version}_${nodeVersion}_${stringify(config)}`));
+    }
+
+    return configHashCache.get(config);
+}
+
+//-----------------------------------------------------------------------------
+// Public Interface
+//-----------------------------------------------------------------------------
+
+/**
+ * Lint result cache. This wraps around the file-entry-cache module,
+ * transparently removing properties that are difficult or expensive to
+ * serialize and adding them back in on retrieval.
+ */
+class LintResultCache {
+
+    /**
+     * Creates a new LintResultCache instance.
+     * @param {string} cacheFileLocation The cache file location.
+     * @param {"metadata" | "content"} cacheStrategy The cache strategy to use.
+     */
+    constructor(cacheFileLocation, cacheStrategy) {
+        assert(cacheFileLocation, "Cache file location is required");
+        assert(cacheStrategy, "Cache strategy is required");
+        assert(
+            isValidCacheStrategy(cacheStrategy),
+            invalidCacheStrategyErrorMessage
+        );
+
+        debug(`Caching results to ${cacheFileLocation}`);
+
+        const useChecksum = cacheStrategy === "content";
+
+        debug(
+            `Using "${cacheStrategy}" strategy to detect changes`
+        );
+
+        this.fileEntryCache = fileEntryCache.create(
+            cacheFileLocation,
+            void 0,
+            useChecksum
+        );
+        this.cacheFileLocation = cacheFileLocation;
+    }
+
+    /**
+     * Retrieve cached lint results for a given file path, if present in the
+     * cache. If the file is present and has not been changed, rebuild any
+     * missing result information.
+     * @param {string} filePath The file for which to retrieve lint results.
+     * @param {ConfigArray} config The config of the file.
+     * @returns {Object|null} The rebuilt lint results, or null if the file is
+     *   changed or not in the filesystem.
+     */
+    getCachedLintResults(filePath, config) {
+
+        /*
+         * Cached lint results are valid if and only if:
+         * 1. The file is present in the filesystem
+         * 2. The file has not changed since the time it was previously linted
+         * 3. The ESLint configuration has not changed since the time the file
+         *    was previously linted
+         * If any of these are not true, we will not reuse the lint results.
+         */
+        const fileDescriptor = this.fileEntryCache.getFileDescriptor(filePath);
+        const hashOfConfig = hashOfConfigFor(config);
+        const changed =
+            fileDescriptor.changed ||
+            fileDescriptor.meta.hashOfConfig !== hashOfConfig;
+
+        if (fileDescriptor.notFound) {
+            debug(`File not found on the file system: ${filePath}`);
+            return null;
+        }
+
+        if (changed) {
+            debug(`Cache entry not found or no longer valid: ${filePath}`);
+            return null;
+        }
+
+        // If source is present but null, need to reread the file from the filesystem.
+        if (
+            fileDescriptor.meta.results &&
+            fileDescriptor.meta.results.source === null
+        ) {
+            debug(`Rereading cached result source from filesystem: ${filePath}`);
+            fileDescriptor.meta.results.source = fs.readFileSync(filePath, "utf-8");
+        }
+
+        return fileDescriptor.meta.results;
+    }
+
+    /**
+     * Set the cached lint results for a given file path, after removing any
+     * information that will be both unnecessary and difficult to serialize.
+     * Avoids caching results with an "output" property (meaning fixes were
+     * applied), to prevent potentially incorrect results if fixes are not
+     * written to disk.
+     * @param {string} filePath The file for which to set lint results.
+     * @param {ConfigArray} config The config of the file.
+     * @param {Object} result The lint result to be set for the file.
+     * @returns {void}
+     */
+    setCachedLintResults(filePath, config, result) {
+        if (result && Object.prototype.hasOwnProperty.call(result, "output")) {
+            return;
+        }
+
+        const fileDescriptor = this.fileEntryCache.getFileDescriptor(filePath);
+
+        if (fileDescriptor && !fileDescriptor.notFound) {
+            debug(`Updating cached result: ${filePath}`);
+
+            // Serialize the result, except that we want to remove the file source if present.
+            const resultToSerialize = Object.assign({}, result);
+
+            /*
+             * Set result.source to null.
+             * In `getCachedLintResults`, if source is explicitly null, we will
+             * read the file from the filesystem to set the value again.
+             */
+            if (Object.prototype.hasOwnProperty.call(resultToSerialize, "source")) {
+                resultToSerialize.source = null;
+            }
+
+            fileDescriptor.meta.results = resultToSerialize;
+            fileDescriptor.meta.hashOfConfig = hashOfConfigFor(config);
+        }
+    }
+
+    /**
+     * Persists the in-memory cache to disk.
+     * @returns {void}
+     */
+    reconcile() {
+        debug(`Persisting cached results: ${this.cacheFileLocation}`);
+        this.fileEntryCache.reconcile();
+    }
+}
+
+module.exports = LintResultCache;

node_modules/eslint/lib/cli-engine/load-rules.js

@@ -0,0 +1,46 @@
+/**
+ * @fileoverview Module for loading rules from files and directories.
+ * @author Michael Ficarra
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const fs = require("fs"),
+    path = require("path");
+
+const rulesDirCache = {};
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * Load all rule modules from specified directory.
+ * @param {string} relativeRulesDir Path to rules directory, may be relative.
+ * @param {string} cwd Current working directory
+ * @returns {Object} Loaded rule modules.
+ */
+module.exports = function(relativeRulesDir, cwd) {
+    const rulesDir = path.resolve(cwd, relativeRulesDir);
+
+    // cache will help performance as IO operation are expensive
+    if (rulesDirCache[rulesDir]) {
+        return rulesDirCache[rulesDir];
+    }
+
+    const rules = Object.create(null);
+
+    fs.readdirSync(rulesDir).forEach(file => {
+        if (path.extname(file) !== ".js") {
+            return;
+        }
+        rules[file.slice(0, -3)] = require(path.join(rulesDir, file));
+    });
+    rulesDirCache[rulesDir] = rules;
+
+    return rules;
+};

node_modules/eslint/lib/cli-engine/xml-escape.js

@@ -0,0 +1,34 @@
+/**
+ * @fileoverview XML character escaper
+ * @author George Chung
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * Returns the escaped value for a character
+ * @param {string} s string to examine
+ * @returns {string} severity level
+ * @private
+ */
+module.exports = function(s) {
+    return (`${s}`).replace(/[<>&"'\x00-\x1F\x7F\u0080-\uFFFF]/gu, c => { // eslint-disable-line no-control-regex
+        switch (c) {
+            case "<":
+                return "&lt;";
+            case ">":
+                return "&gt;";
+            case "&":
+                return "&amp;";
+            case "\"":
+                return "&quot;";
+            case "'":
+                return "&apos;";
+            default:
+                return `&#${c.charCodeAt(0)};`;
+        }
+    });
+};

node_modules/eslint/lib/cli.js

@@ -0,0 +1,344 @@
+/**
+ * @fileoverview Main CLI object.
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+/*
+ * The CLI object should *not* call process.exit() directly. It should only return
+ * exit codes. This allows other programs to use the CLI object and still control
+ * when the program exits.
+ */
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const fs = require("fs"),
+    path = require("path"),
+    { promisify } = require("util"),
+    { ESLint } = require("./eslint"),
+    CLIOptions = require("./options"),
+    log = require("./shared/logging"),
+    RuntimeInfo = require("./shared/runtime-info");
+
+const debug = require("debug")("eslint:cli");
+
+//------------------------------------------------------------------------------
+// Types
+//------------------------------------------------------------------------------
+
+/** @typedef {import("./eslint/eslint").ESLintOptions} ESLintOptions */
+/** @typedef {import("./eslint/eslint").LintMessage} LintMessage */
+/** @typedef {import("./eslint/eslint").LintResult} LintResult */
+/** @typedef {import("./options").ParsedCLIOptions} ParsedCLIOptions */
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+const mkdir = promisify(fs.mkdir);
+const stat = promisify(fs.stat);
+const writeFile = promisify(fs.writeFile);
+
+/**
+ * Predicate function for whether or not to apply fixes in quiet mode.
+ * If a message is a warning, do not apply a fix.
+ * @param {LintMessage} message The lint result.
+ * @returns {boolean} True if the lint message is an error (and thus should be
+ * autofixed), false otherwise.
+ */
+function quietFixPredicate(message) {
+    return message.severity === 2;
+}
+
+/**
+ * Translates the CLI options into the options expected by the CLIEngine.
+ * @param {ParsedCLIOptions} cliOptions The CLI options to translate.
+ * @returns {ESLintOptions} The options object for the CLIEngine.
+ * @private
+ */
+function translateOptions({
+    cache,
+    cacheFile,
+    cacheLocation,
+    cacheStrategy,
+    config,
+    env,
+    errorOnUnmatchedPattern,
+    eslintrc,
+    ext,
+    fix,
+    fixDryRun,
+    fixType,
+    global,
+    ignore,
+    ignorePath,
+    ignorePattern,
+    inlineConfig,
+    parser,
+    parserOptions,
+    plugin,
+    quiet,
+    reportUnusedDisableDirectives,
+    resolvePluginsRelativeTo,
+    rule,
+    rulesdir
+}) {
+    return {
+        allowInlineConfig: inlineConfig,
+        cache,
+        cacheLocation: cacheLocation || cacheFile,
+        cacheStrategy,
+        errorOnUnmatchedPattern,
+        extensions: ext,
+        fix: (fix || fixDryRun) && (quiet ? quietFixPredicate : true),
+        fixTypes: fixType,
+        ignore,
+        ignorePath,
+        overrideConfig: {
+            env: env && env.reduce((obj, name) => {
+                obj[name] = true;
+                return obj;
+            }, {}),
+            globals: global && global.reduce((obj, name) => {
+                if (name.endsWith(":true")) {
+                    obj[name.slice(0, -5)] = "writable";
+                } else {
+                    obj[name] = "readonly";
+                }
+                return obj;
+            }, {}),
+            ignorePatterns: ignorePattern,
+            parser,
+            parserOptions,
+            plugins: plugin,
+            rules: rule
+        },
+        overrideConfigFile: config,
+        reportUnusedDisableDirectives: reportUnusedDisableDirectives ? "error" : void 0,
+        resolvePluginsRelativeTo,
+        rulePaths: rulesdir,
+        useEslintrc: eslintrc
+    };
+}
+
+/**
+ * Count error messages.
+ * @param {LintResult[]} results The lint results.
+ * @returns {{errorCount:number;warningCount:number}} The number of error messages.
+ */
+function countErrors(results) {
+    let errorCount = 0;
+    let fatalErrorCount = 0;
+    let warningCount = 0;
+
+    for (const result of results) {
+        errorCount += result.errorCount;
+        fatalErrorCount += result.fatalErrorCount;
+        warningCount += result.warningCount;
+    }
+
+    return { errorCount, fatalErrorCount, warningCount };
+}
+
+/**
+ * Check if a given file path is a directory or not.
+ * @param {string} filePath The path to a file to check.
+ * @returns {Promise<boolean>} `true` if the given path is a directory.
+ */
+async function isDirectory(filePath) {
+    try {
+        return (await stat(filePath)).isDirectory();
+    } catch (error) {
+        if (error.code === "ENOENT" || error.code === "ENOTDIR") {
+            return false;
+        }
+        throw error;
+    }
+}
+
+/**
+ * Outputs the results of the linting.
+ * @param {ESLint} engine The ESLint instance to use.
+ * @param {LintResult[]} results The results to print.
+ * @param {string} format The name of the formatter to use or the path to the formatter.
+ * @param {string} outputFile The path for the output file.
+ * @returns {Promise<boolean>} True if the printing succeeds, false if not.
+ * @private
+ */
+async function printResults(engine, results, format, outputFile) {
+    let formatter;
+
+    try {
+        formatter = await engine.loadFormatter(format);
+    } catch (e) {
+        log.error(e.message);
+        return false;
+    }
+
+    const output = formatter.format(results);
+
+    if (output) {
+        if (outputFile) {
+            const filePath = path.resolve(process.cwd(), outputFile);
+
+            if (await isDirectory(filePath)) {
+                log.error("Cannot write to output file path, it is a directory: %s", outputFile);
+                return false;
+            }
+
+            try {
+                await mkdir(path.dirname(filePath), { recursive: true });
+                await writeFile(filePath, output);
+            } catch (ex) {
+                log.error("There was a problem writing the output file:\n%s", ex);
+                return false;
+            }
+        } else {
+            log.info(output);
+        }
+    }
+
+    return true;
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * Encapsulates all CLI behavior for eslint. Makes it easier to test as well as
+ * for other Node.js programs to effectively run the CLI.
+ */
+const cli = {
+
+    /**
+     * Executes the CLI based on an array of arguments that is passed in.
+     * @param {string|Array|Object} args The arguments to process.
+     * @param {string} [text] The text to lint (used for TTY).
+     * @returns {Promise<number>} The exit code for the operation.
+     */
+    async execute(args, text) {
+        if (Array.isArray(args)) {
+            debug("CLI args: %o", args.slice(2));
+        }
+
+        /** @type {ParsedCLIOptions} */
+        let options;
+
+        try {
+            options = CLIOptions.parse(args);
+        } catch (error) {
+            log.error(error.message);
+            return 2;
+        }
+
+        const files = options._;
+        const useStdin = typeof text === "string";
+
+        if (options.help) {
+            log.info(CLIOptions.generateHelp());
+            return 0;
+        }
+        if (options.version) {
+            log.info(RuntimeInfo.version());
+            return 0;
+        }
+        if (options.envInfo) {
+            try {
+                log.info(RuntimeInfo.environment());
+                return 0;
+            } catch (err) {
+                log.error(err.message);
+                return 2;
+            }
+        }
+
+        if (options.printConfig) {
+            if (files.length) {
+                log.error("The --print-config option must be used with exactly one file name.");
+                return 2;
+            }
+            if (useStdin) {
+                log.error("The --print-config option is not available for piped-in code.");
+                return 2;
+            }
+
+            const engine = new ESLint(translateOptions(options));
+            const fileConfig =
+                await engine.calculateConfigForFile(options.printConfig);
+
+            log.info(JSON.stringify(fileConfig, null, "  "));
+            return 0;
+        }
+
+        debug(`Running on ${useStdin ? "text" : "files"}`);
+
+        if (options.fix && options.fixDryRun) {
+            log.error("The --fix option and the --fix-dry-run option cannot be used together.");
+            return 2;
+        }
+        if (useStdin && options.fix) {
+            log.error("The --fix option is not available for piped-in code; use --fix-dry-run instead.");
+            return 2;
+        }
+        if (options.fixType && !options.fix && !options.fixDryRun) {
+            log.error("The --fix-type option requires either --fix or --fix-dry-run.");
+            return 2;
+        }
+
+        const engine = new ESLint(translateOptions(options));
+        let results;
+
+        if (useStdin) {
+            results = await engine.lintText(text, {
+                filePath: options.stdinFilename,
+                warnIgnored: true
+            });
+        } else {
+            results = await engine.lintFiles(files);
+        }
+
+        if (options.fix) {
+            debug("Fix mode enabled - applying fixes");
+            await ESLint.outputFixes(results);
+        }
+
+        let resultsToPrint = results;
+
+        if (options.quiet) {
+            debug("Quiet mode enabled - filtering out warnings");
+            resultsToPrint = ESLint.getErrorResults(resultsToPrint);
+        }
+
+        if (await printResults(engine, resultsToPrint, options.format, options.outputFile)) {
+
+            // Errors and warnings from the original unfiltered results should determine the exit code
+            const { errorCount, fatalErrorCount, warningCount } = countErrors(results);
+
+            const tooManyWarnings =
+                options.maxWarnings >= 0 && warningCount > options.maxWarnings;
+            const shouldExitForFatalErrors =
+                options.exitOnFatalError && fatalErrorCount > 0;
+
+            if (!errorCount && tooManyWarnings) {
+                log.error(
+                    "ESLint found too many warnings (maximum: %s).",
+                    options.maxWarnings
+                );
+            }
+
+            if (shouldExitForFatalErrors) {
+                return 2;
+            }
+
+            return (errorCount || tooManyWarnings) ? 1 : 0;
+        }
+
+        return 2;
+    }
+};
+
+module.exports = cli;

node_modules/eslint/lib/config/default-config.js

@@ -0,0 +1,52 @@
+/**
+ * @fileoverview Default configuration
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//-----------------------------------------------------------------------------
+// Requirements
+//-----------------------------------------------------------------------------
+
+const Rules = require("../rules");
+
+//-----------------------------------------------------------------------------
+// Helpers
+//-----------------------------------------------------------------------------
+
+
+exports.defaultConfig = [
+    {
+        plugins: {
+            "@": {
+                parsers: {
+                    espree: require("espree")
+                },
+
+                /*
+                 * Because we try to delay loading rules until absolutely
+                 * necessary, a proxy  allows us to hook into the lazy-loading
+                 * aspect of the rules map while still keeping all of the
+                 * relevant configuration inside of the config array.
+                 */
+                rules: new Proxy({}, {
+                    get(target, property) {
+                        return Rules.get(property);
+                    },
+
+                    has(target, property) {
+                        return Rules.has(property);
+                    }
+                })
+            }
+        },
+        ignores: [
+            "**/node_modules/**",
+            ".git/**"
+        ],
+        languageOptions: {
+            parser: "@/espree"
+        }
+    }
+];

node_modules/eslint/lib/config/flat-config-array.js

@@ -0,0 +1,125 @@
+/**
+ * @fileoverview Flat Config Array
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//-----------------------------------------------------------------------------
+// Requirements
+//-----------------------------------------------------------------------------
+
+const { ConfigArray, ConfigArraySymbol } = require("@humanwhocodes/config-array");
+const { flatConfigSchema } = require("./flat-config-schema");
+const { RuleValidator } = require("./rule-validator");
+const { defaultConfig } = require("./default-config");
+const recommendedConfig = require("../../conf/eslint-recommended");
+const allConfig = require("../../conf/eslint-all");
+
+//-----------------------------------------------------------------------------
+// Helpers
+//-----------------------------------------------------------------------------
+
+const ruleValidator = new RuleValidator();
+
+/**
+ * Splits a plugin identifier in the form a/b/c into two parts: a/b and c.
+ * @param {string} identifier The identifier to parse.
+ * @returns {{objectName: string, pluginName: string}} The parts of the plugin
+ *      name.
+ */
+function splitPluginIdentifier(identifier) {
+    const parts = identifier.split("/");
+
+    return {
+        objectName: parts.pop(),
+        pluginName: parts.join("/")
+    };
+}
+
+//-----------------------------------------------------------------------------
+// Exports
+//-----------------------------------------------------------------------------
+
+/**
+ * Represents an array containing configuration information for ESLint.
+ */
+class FlatConfigArray extends ConfigArray {
+
+    /**
+     * Creates a new instance.
+     * @param {*[]} configs An array of configuration information.
+     * @param {{basePath: string, baseConfig: FlatConfig}} options The options
+     *      to use for the config array instance.
+     */
+    constructor(configs, { basePath, baseConfig = defaultConfig }) {
+        super(configs, {
+            basePath,
+            schema: flatConfigSchema
+        });
+
+        this.unshift(baseConfig);
+    }
+
+    /* eslint-disable class-methods-use-this */
+    /**
+     * Replaces a config with another config to allow us to put strings
+     * in the config array that will be replaced by objects before
+     * normalization.
+     * @param {Object} config The config to preprocess.
+     * @returns {Object} The preprocessed config.
+     */
+    [ConfigArraySymbol.preprocessConfig](config) {
+        if (config === "eslint:recommended") {
+            return recommendedConfig;
+        }
+
+        if (config === "eslint:all") {
+            return allConfig;
+        }
+
+        return config;
+    }
+
+    /**
+     * Finalizes the config by replacing plugin references with their objects
+     * and validating rule option schemas.
+     * @param {Object} config The config to finalize.
+     * @returns {Object} The finalized config.
+     * @throws {TypeError} If the config is invalid.
+     */
+    [ConfigArraySymbol.finalizeConfig](config) {
+
+        const { plugins, languageOptions, processor } = config;
+
+        // Check parser value
+        if (languageOptions && languageOptions.parser && typeof languageOptions.parser === "string") {
+            const { pluginName, objectName: parserName } = splitPluginIdentifier(languageOptions.parser);
+
+            if (!plugins || !plugins[pluginName] || !plugins[pluginName].parsers || !plugins[pluginName].parsers[parserName]) {
+                throw new TypeError(`Key "parser": Could not find "${parserName}" in plugin "${pluginName}".`);
+            }
+
+            languageOptions.parser = plugins[pluginName].parsers[parserName];
+        }
+
+        // Check processor value
+        if (processor && typeof processor === "string") {
+            const { pluginName, objectName: processorName } = splitPluginIdentifier(processor);
+
+            if (!plugins || !plugins[pluginName] || !plugins[pluginName].processors || !plugins[pluginName].processors[processorName]) {
+                throw new TypeError(`Key "processor": Could not find "${processorName}" in plugin "${pluginName}".`);
+            }
+
+            config.processor = plugins[pluginName].processors[processorName];
+        }
+
+        ruleValidator.validate(config);
+
+        return config;
+    }
+    /* eslint-enable class-methods-use-this */
+
+}
+
+exports.FlatConfigArray = FlatConfigArray;

node_modules/eslint/lib/config/flat-config-schema.js

@@ -0,0 +1,452 @@
+/**
+ * @fileoverview Flat config schema
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//-----------------------------------------------------------------------------
+// Type Definitions
+//-----------------------------------------------------------------------------
+
+/**
+ * @typedef ObjectPropertySchema
+ * @property {Function|string} merge The function or name of the function to call
+ *      to merge multiple objects with this property.
+ * @property {Function|string} validate The function or name of the function to call
+ *      to validate the value of this property.
+ */
+
+//-----------------------------------------------------------------------------
+// Helpers
+//-----------------------------------------------------------------------------
+
+const ruleSeverities = new Map([
+    [0, 0], ["off", 0],
+    [1, 1], ["warn", 1],
+    [2, 2], ["error", 2]
+]);
+
+const globalVariablesValues = new Set([
+    true, "true", "writable", "writeable",
+    false, "false", "readonly", "readable", null,
+    "off"
+]);
+
+/**
+ * Check if a value is a non-null object.
+ * @param {any} value The value to check.
+ * @returns {boolean} `true` if the value is a non-null object.
+ */
+function isNonNullObject(value) {
+    return typeof value === "object" && value !== null;
+}
+
+/**
+ * Check if a value is undefined.
+ * @param {any} value The value to check.
+ * @returns {boolean} `true` if the value is undefined.
+ */
+function isUndefined(value) {
+    return typeof value === "undefined";
+}
+
+/**
+ * Deeply merges two objects.
+ * @param {Object} first The base object.
+ * @param {Object} second The overrides object.
+ * @returns {Object} An object with properties from both first and second.
+ */
+function deepMerge(first = {}, second = {}) {
+
+    /*
+     * If the second value is an array, just return it. We don't merge
+     * arrays because order matters and we can't know the correct order.
+     */
+    if (Array.isArray(second)) {
+        return second;
+    }
+
+    /*
+     * First create a result object where properties from the second object
+     * overwrite properties from the first. This sets up a baseline to use
+     * later rather than needing to inspect and change every property
+     * individually.
+     */
+    const result = {
+        ...first,
+        ...second
+    };
+
+    for (const key of Object.keys(second)) {
+
+        // avoid hairy edge case
+        if (key === "__proto__") {
+            continue;
+        }
+
+        const firstValue = first[key];
+        const secondValue = second[key];
+
+        if (isNonNullObject(firstValue)) {
+            result[key] = deepMerge(firstValue, secondValue);
+        } else if (isUndefined(firstValue)) {
+            if (isNonNullObject(secondValue)) {
+                result[key] = deepMerge(
+                    Array.isArray(secondValue) ? [] : {},
+                    secondValue
+                );
+            } else if (!isUndefined(secondValue)) {
+                result[key] = secondValue;
+            }
+        }
+    }
+
+    return result;
+
+}
+
+/**
+ * Normalizes the rule options config for a given rule by ensuring that
+ * it is an array and that the first item is 0, 1, or 2.
+ * @param {Array|string|number} ruleOptions The rule options config.
+ * @returns {Array} An array of rule options.
+ */
+function normalizeRuleOptions(ruleOptions) {
+
+    const finalOptions = Array.isArray(ruleOptions)
+        ? ruleOptions.slice(0)
+        : [ruleOptions];
+
+    finalOptions[0] = ruleSeverities.get(finalOptions[0]);
+    return finalOptions;
+}
+
+//-----------------------------------------------------------------------------
+// Assertions
+//-----------------------------------------------------------------------------
+
+/**
+ * Validates that a value is a valid rule options entry.
+ * @param {any} value The value to check.
+ * @returns {void}
+ * @throws {TypeError} If the value isn't a valid rule options.
+ */
+function assertIsRuleOptions(value) {
+
+    if (typeof value !== "string" && typeof value !== "number" && !Array.isArray(value)) {
+        throw new TypeError("Expected a string, number, or array.");
+    }
+}
+
+/**
+ * Validates that a value is valid rule severity.
+ * @param {any} value The value to check.
+ * @returns {void}
+ * @throws {TypeError} If the value isn't a valid rule severity.
+ */
+function assertIsRuleSeverity(value) {
+    const severity = typeof value === "string"
+        ? ruleSeverities.get(value.toLowerCase())
+        : ruleSeverities.get(value);
+
+    if (typeof severity === "undefined") {
+        throw new TypeError("Expected severity of \"off\", 0, \"warn\", 1, \"error\", or 2.");
+    }
+}
+
+/**
+ * Validates that a given string is the form pluginName/objectName.
+ * @param {string} value The string to check.
+ * @returns {void}
+ * @throws {TypeError} If the string isn't in the correct format.
+ */
+function assertIsPluginMemberName(value) {
+    if (!/[@a-z0-9-_$]+(?:\/(?:[a-z0-9-_$]+))+$/iu.test(value)) {
+        throw new TypeError(`Expected string in the form "pluginName/objectName" but found "${value}".`);
+    }
+}
+
+/**
+ * Validates that a value is an object.
+ * @param {any} value The value to check.
+ * @returns {void}
+ * @throws {TypeError} If the value isn't an object.
+ */
+function assertIsObject(value) {
+    if (!isNonNullObject(value)) {
+        throw new TypeError("Expected an object.");
+    }
+}
+
+/**
+ * Validates that a value is an object or a string.
+ * @param {any} value The value to check.
+ * @returns {void}
+ * @throws {TypeError} If the value isn't an object or a string.
+ */
+function assertIsObjectOrString(value) {
+    if ((!value || typeof value !== "object") && typeof value !== "string") {
+        throw new TypeError("Expected an object or string.");
+    }
+}
+
+//-----------------------------------------------------------------------------
+// Low-Level Schemas
+//-----------------------------------------------------------------------------
+
+
+/** @type {ObjectPropertySchema} */
+const numberSchema = {
+    merge: "replace",
+    validate: "number"
+};
+
+/** @type {ObjectPropertySchema} */
+const booleanSchema = {
+    merge: "replace",
+    validate: "boolean"
+};
+
+/** @type {ObjectPropertySchema} */
+const deepObjectAssignSchema = {
+    merge(first = {}, second = {}) {
+        return deepMerge(first, second);
+    },
+    validate: "object"
+};
+
+//-----------------------------------------------------------------------------
+// High-Level Schemas
+//-----------------------------------------------------------------------------
+
+/** @type {ObjectPropertySchema} */
+const globalsSchema = {
+    merge: "assign",
+    validate(value) {
+
+        assertIsObject(value);
+
+        for (const key of Object.keys(value)) {
+
+            // avoid hairy edge case
+            if (key === "__proto__") {
+                continue;
+            }
+
+            if (key !== key.trim()) {
+                throw new TypeError(`Global "${key}" has leading or trailing whitespace.`);
+            }
+
+            if (!globalVariablesValues.has(value[key])) {
+                throw new TypeError(`Key "${key}": Expected "readonly", "writable", or "off".`);
+            }
+        }
+    }
+};
+
+/** @type {ObjectPropertySchema} */
+const parserSchema = {
+    merge: "replace",
+    validate(value) {
+        assertIsObjectOrString(value);
+
+        if (typeof value === "object" && typeof value.parse !== "function" && typeof value.parseForESLint !== "function") {
+            throw new TypeError("Expected object to have a parse() or parseForESLint() method.");
+        }
+
+        if (typeof value === "string") {
+            assertIsPluginMemberName(value);
+        }
+    }
+};
+
+/** @type {ObjectPropertySchema} */
+const pluginsSchema = {
+    merge(first = {}, second = {}) {
+        const keys = new Set([...Object.keys(first), ...Object.keys(second)]);
+        const result = {};
+
+        // manually validate that plugins are not redefined
+        for (const key of keys) {
+
+            // avoid hairy edge case
+            if (key === "__proto__") {
+                continue;
+            }
+
+            if (key in first && key in second && first[key] !== second[key]) {
+                throw new TypeError(`Cannot redefine plugin "${key}".`);
+            }
+
+            result[key] = second[key] || first[key];
+        }
+
+        return result;
+    },
+    validate(value) {
+
+        // first check the value to be sure it's an object
+        if (value === null || typeof value !== "object") {
+            throw new TypeError("Expected an object.");
+        }
+
+        // second check the keys to make sure they are objects
+        for (const key of Object.keys(value)) {
+
+            // avoid hairy edge case
+            if (key === "__proto__") {
+                continue;
+            }
+
+            if (value[key] === null || typeof value[key] !== "object") {
+                throw new TypeError(`Key "${key}": Expected an object.`);
+            }
+        }
+    }
+};
+
+/** @type {ObjectPropertySchema} */
+const processorSchema = {
+    merge: "replace",
+    validate(value) {
+        if (typeof value === "string") {
+            assertIsPluginMemberName(value);
+        } else if (value && typeof value === "object") {
+            if (typeof value.preprocess !== "function" || typeof value.postprocess !== "function") {
+                throw new TypeError("Object must have a preprocess() and a postprocess() method.");
+            }
+        } else {
+            throw new TypeError("Expected an object or a string.");
+        }
+    }
+};
+
+/** @type {ObjectPropertySchema} */
+const rulesSchema = {
+    merge(first = {}, second = {}) {
+
+        const result = {
+            ...first,
+            ...second
+        };
+
+        for (const ruleId of Object.keys(result)) {
+
+            // avoid hairy edge case
+            if (ruleId === "__proto__") {
+
+                /* eslint-disable-next-line no-proto */
+                delete result.__proto__;
+                continue;
+            }
+
+            result[ruleId] = normalizeRuleOptions(result[ruleId]);
+
+            /*
+             * If either rule config is missing, then the correct
+             * config is already present and we just need to normalize
+             * the severity.
+             */
+            if (!(ruleId in first) || !(ruleId in second)) {
+                continue;
+            }
+
+            const firstRuleOptions = normalizeRuleOptions(first[ruleId]);
+            const secondRuleOptions = normalizeRuleOptions(second[ruleId]);
+
+            /*
+             * If the second rule config only has a severity (length of 1),
+             * then use that severity and keep the rest of the options from
+             * the first rule config.
+             */
+            if (secondRuleOptions.length === 1) {
+                result[ruleId] = [secondRuleOptions[0], ...firstRuleOptions.slice(1)];
+                continue;
+            }
+
+            /*
+             * In any other situation, then the second rule config takes
+             * precedence. That means the value at `result[ruleId]` is
+             * already correct and no further work is necessary.
+             */
+        }
+
+        return result;
+    },
+
+    validate(value) {
+        assertIsObject(value);
+
+        let lastRuleId;
+
+        // Performance: One try-catch has less overhead than one per loop iteration
+        try {
+
+            /*
+             * We are not checking the rule schema here because there is no
+             * guarantee that the rule definition is present at this point. Instead
+             * we wait and check the rule schema during the finalization step
+             * of calculating a config.
+             */
+            for (const ruleId of Object.keys(value)) {
+
+                // avoid hairy edge case
+                if (ruleId === "__proto__") {
+                    continue;
+                }
+
+                lastRuleId = ruleId;
+
+                const ruleOptions = value[ruleId];
+
+                assertIsRuleOptions(ruleOptions);
+
+                if (Array.isArray(ruleOptions)) {
+                    assertIsRuleSeverity(ruleOptions[0]);
+                } else {
+                    assertIsRuleSeverity(ruleOptions);
+                }
+            }
+        } catch (error) {
+            error.message = `Key "${lastRuleId}": ${error.message}`;
+            throw error;
+        }
+    }
+};
+
+/** @type {ObjectPropertySchema} */
+const sourceTypeSchema = {
+    merge: "replace",
+    validate(value) {
+        if (typeof value !== "string" || !/^(?:script|module|commonjs)$/u.test(value)) {
+            throw new TypeError("Expected \"script\", \"module\", or \"commonjs\".");
+        }
+    }
+};
+
+//-----------------------------------------------------------------------------
+// Full schema
+//-----------------------------------------------------------------------------
+
+exports.flatConfigSchema = {
+    settings: deepObjectAssignSchema,
+    linterOptions: {
+        schema: {
+            noInlineConfig: booleanSchema,
+            reportUnusedDisableDirectives: booleanSchema
+        }
+    },
+    languageOptions: {
+        schema: {
+            ecmaVersion: numberSchema,
+            sourceType: sourceTypeSchema,
+            globals: globalsSchema,
+            parser: parserSchema,
+            parserOptions: deepObjectAssignSchema
+        }
+    },
+    processor: processorSchema,
+    plugins: pluginsSchema,
+    rules: rulesSchema
+};

node_modules/eslint/lib/config/rule-validator.js

@@ -0,0 +1,169 @@
+/**
+ * @fileoverview Rule Validator
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//-----------------------------------------------------------------------------
+// Requirements
+//-----------------------------------------------------------------------------
+
+const ajv = require("../shared/ajv")();
+
+//-----------------------------------------------------------------------------
+// Helpers
+//-----------------------------------------------------------------------------
+
+/**
+ * Finds a rule with the given ID in the given config.
+ * @param {string} ruleId The ID of the rule to find.
+ * @param {Object} config The config to search in.
+ * @returns {{create: Function, schema: (Array|null)}} THe rule object.
+ */
+function findRuleDefinition(ruleId, config) {
+    const ruleIdParts = ruleId.split("/");
+    let pluginName, ruleName;
+
+    // built-in rule
+    if (ruleIdParts.length === 1) {
+        pluginName = "@";
+        ruleName = ruleIdParts[0];
+    } else {
+        ruleName = ruleIdParts.pop();
+        pluginName = ruleIdParts.join("/");
+    }
+
+    if (!config.plugins || !config.plugins[pluginName]) {
+        throw new TypeError(`Key "rules": Key "${ruleId}": Could not find plugin "${pluginName}".`);
+    }
+
+    if (!config.plugins[pluginName].rules || !config.plugins[pluginName].rules[ruleName]) {
+        throw new TypeError(`Key "rules": Key "${ruleId}": Could not find "${ruleName}" in plugin "${pluginName}".`);
+    }
+
+    return config.plugins[pluginName].rules[ruleName];
+
+}
+
+/**
+ * Gets a complete options schema for a rule.
+ * @param {{create: Function, schema: (Array|null)}} rule A new-style rule object
+ * @returns {Object} JSON Schema for the rule's options.
+ */
+function getRuleOptionsSchema(rule) {
+
+    if (!rule) {
+        return null;
+    }
+
+    const schema = rule.schema || rule.meta && rule.meta.schema;
+
+    if (Array.isArray(schema)) {
+        if (schema.length) {
+            return {
+                type: "array",
+                items: schema,
+                minItems: 0,
+                maxItems: schema.length
+            };
+        }
+        return {
+            type: "array",
+            minItems: 0,
+            maxItems: 0
+        };
+
+    }
+
+    // Given a full schema, leave it alone
+    return schema || null;
+}
+
+//-----------------------------------------------------------------------------
+// Exports
+//-----------------------------------------------------------------------------
+
+/**
+ * Implements validation functionality for the rules portion of a config.
+ */
+class RuleValidator {
+
+    /**
+     * Creates a new instance.
+     */
+    constructor() {
+
+        /**
+         * A collection of compiled validators for rules that have already
+         * been validated.
+         * @type {WeakMap}
+         * @property validators
+         */
+        this.validators = new WeakMap();
+    }
+
+    /**
+     * Validates all of the rule configurations in a config against each
+     * rule's schema.
+     * @param {Object} config The full config to validate. This object must
+     *      contain both the rules section and the plugins section.
+     * @returns {void}
+     * @throws {Error} If a rule's configuration does not match its schema.
+     */
+    validate(config) {
+
+        if (!config.rules) {
+            return;
+        }
+
+        for (const [ruleId, ruleOptions] of Object.entries(config.rules)) {
+
+            // check for edge case
+            if (ruleId === "__proto__") {
+                continue;
+            }
+
+            /*
+             * If a rule is disabled, we don't do any validation. This allows
+             * users to safely set any value to 0 or "off" without worrying
+             * that it will cause a validation error.
+             *
+             * Note: ruleOptions is always an array at this point because
+             * this validation occurs after FlatConfigArray has merged and
+             * normalized values.
+             */
+            if (ruleOptions[0] === 0) {
+                continue;
+            }
+
+            const rule = findRuleDefinition(ruleId, config);
+
+            // Precompile and cache validator the first time
+            if (!this.validators.has(rule)) {
+                const schema = getRuleOptionsSchema(rule);
+
+                if (schema) {
+                    this.validators.set(rule, ajv.compile(schema));
+                }
+            }
+
+            const validateRule = this.validators.get(rule);
+
+            if (validateRule) {
+
+                validateRule(ruleOptions.slice(1));
+
+                if (validateRule.errors) {
+                    throw new Error(`Key "rules": Key "${ruleId}": ${
+                        validateRule.errors.map(
+                            error => `\tValue ${JSON.stringify(error.data)} ${error.message}.\n`
+                        ).join("")
+                    }`);
+                }
+            }
+        }
+    }
+}
+
+exports.RuleValidator = RuleValidator;

node_modules/eslint/lib/eslint/eslint.js

@@ -0,0 +1,707 @@
+/**
+ * @fileoverview Main API Class
+ * @author Kai Cataldo
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const path = require("path");
+const fs = require("fs");
+const { promisify } = require("util");
+const { CLIEngine, getCLIEngineInternalSlots } = require("../cli-engine/cli-engine");
+const BuiltinRules = require("../rules");
+const {
+    Legacy: {
+        ConfigOps: {
+            getRuleSeverity
+        }
+    }
+} = require("@eslint/eslintrc");
+const { version } = require("../../package.json");
+
+//------------------------------------------------------------------------------
+// Typedefs
+//------------------------------------------------------------------------------
+
+/** @typedef {import("../cli-engine/cli-engine").LintReport} CLIEngineLintReport */
+/** @typedef {import("../shared/types").DeprecatedRuleInfo} DeprecatedRuleInfo */
+/** @typedef {import("../shared/types").ConfigData} ConfigData */
+/** @typedef {import("../shared/types").LintMessage} LintMessage */
+/** @typedef {import("../shared/types").Plugin} Plugin */
+/** @typedef {import("../shared/types").Rule} Rule */
+/** @typedef {import("./load-formatter").Formatter} Formatter */
+
+/**
+ * The options with which to configure the ESLint instance.
+ * @typedef {Object} ESLintOptions
+ * @property {boolean} [allowInlineConfig] Enable or disable inline configuration comments.
+ * @property {ConfigData} [baseConfig] Base config object, extended by all configs used with this instance
+ * @property {boolean} [cache] Enable result caching.
+ * @property {string} [cacheLocation] The cache file to use instead of .eslintcache.
+ * @property {"metadata" | "content"} [cacheStrategy] The strategy used to detect changed files.
+ * @property {string} [cwd] The value to use for the current working directory.
+ * @property {boolean} [errorOnUnmatchedPattern] If `false` then `ESLint#lintFiles()` doesn't throw even if no target files found. Defaults to `true`.
+ * @property {string[]} [extensions] An array of file extensions to check.
+ * @property {boolean|Function} [fix] Execute in autofix mode. If a function, should return a boolean.
+ * @property {string[]} [fixTypes] Array of rule types to apply fixes for.
+ * @property {boolean} [globInputPaths] Set to false to skip glob resolution of input file paths to lint (default: true). If false, each input file paths is assumed to be a non-glob path to an existing file.
+ * @property {boolean} [ignore] False disables use of .eslintignore.
+ * @property {string} [ignorePath] The ignore file to use instead of .eslintignore.
+ * @property {ConfigData} [overrideConfig] Override config object, overrides all configs used with this instance
+ * @property {string} [overrideConfigFile] The configuration file to use.
+ * @property {Record<string,Plugin>} [plugins] An array of plugin implementations.
+ * @property {"error" | "warn" | "off"} [reportUnusedDisableDirectives] the severity to report unused eslint-disable directives.
+ * @property {string} [resolvePluginsRelativeTo] The folder where plugins should be resolved from, defaulting to the CWD.
+ * @property {string[]} [rulePaths] An array of directories to load custom rules from.
+ * @property {boolean} [useEslintrc] False disables looking for .eslintrc.* files.
+ */
+
+/**
+ * A rules metadata object.
+ * @typedef {Object} RulesMeta
+ * @property {string} id The plugin ID.
+ * @property {Object} definition The plugin definition.
+ */
+
+/**
+ * A linting result.
+ * @typedef {Object} LintResult
+ * @property {string} filePath The path to the file that was linted.
+ * @property {LintMessage[]} messages All of the messages for the result.
+ * @property {number} errorCount Number of errors for the result.
+ * @property {number} warningCount Number of warnings for the result.
+ * @property {number} fixableErrorCount Number of fixable errors for the result.
+ * @property {number} fixableWarningCount Number of fixable warnings for the result.
+ * @property {string} [source] The source code of the file that was linted.
+ * @property {string} [output] The source code of the file that was linted, with as many fixes applied as possible.
+ * @property {DeprecatedRuleInfo[]} usedDeprecatedRules The list of used deprecated rules.
+ */
+
+/**
+ * Private members for the `ESLint` instance.
+ * @typedef {Object} ESLintPrivateMembers
+ * @property {CLIEngine} cliEngine The wrapped CLIEngine instance.
+ * @property {ESLintOptions} options The options used to instantiate the ESLint instance.
+ */
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+const writeFile = promisify(fs.writeFile);
+
+/**
+ * The map with which to store private class members.
+ * @type {WeakMap<ESLint, ESLintPrivateMembers>}
+ */
+const privateMembersMap = new WeakMap();
+
+/**
+ * Check if a given value is a non-empty string or not.
+ * @param {any} x The value to check.
+ * @returns {boolean} `true` if `x` is a non-empty string.
+ */
+function isNonEmptyString(x) {
+    return typeof x === "string" && x.trim() !== "";
+}
+
+/**
+ * Check if a given value is an array of non-empty stringss or not.
+ * @param {any} x The value to check.
+ * @returns {boolean} `true` if `x` is an array of non-empty stringss.
+ */
+function isArrayOfNonEmptyString(x) {
+    return Array.isArray(x) && x.every(isNonEmptyString);
+}
+
+/**
+ * Check if a given value is a valid fix type or not.
+ * @param {any} x The value to check.
+ * @returns {boolean} `true` if `x` is valid fix type.
+ */
+function isFixType(x) {
+    return x === "problem" || x === "suggestion" || x === "layout";
+}
+
+/**
+ * Check if a given value is an array of fix types or not.
+ * @param {any} x The value to check.
+ * @returns {boolean} `true` if `x` is an array of fix types.
+ */
+function isFixTypeArray(x) {
+    return Array.isArray(x) && x.every(isFixType);
+}
+
+/**
+ * The error for invalid options.
+ */
+class ESLintInvalidOptionsError extends Error {
+    constructor(messages) {
+        super(`Invalid Options:\n- ${messages.join("\n- ")}`);
+        this.code = "ESLINT_INVALID_OPTIONS";
+        Error.captureStackTrace(this, ESLintInvalidOptionsError);
+    }
+}
+
+/**
+ * Validates and normalizes options for the wrapped CLIEngine instance.
+ * @param {ESLintOptions} options The options to process.
+ * @returns {ESLintOptions} The normalized options.
+ */
+function processOptions({
+    allowInlineConfig = true, // ← we cannot use `overrideConfig.noInlineConfig` instead because `allowInlineConfig` has side-effect that suppress warnings that show inline configs are ignored.
+    baseConfig = null,
+    cache = false,
+    cacheLocation = ".eslintcache",
+    cacheStrategy = "metadata",
+    cwd = process.cwd(),
+    errorOnUnmatchedPattern = true,
+    extensions = null, // ← should be null by default because if it's an array then it suppresses RFC20 feature.
+    fix = false,
+    fixTypes = null, // ← should be null by default because if it's an array then it suppresses rules that don't have the `meta.type` property.
+    globInputPaths = true,
+    ignore = true,
+    ignorePath = null, // ← should be null by default because if it's a string then it may throw ENOENT.
+    overrideConfig = null,
+    overrideConfigFile = null,
+    plugins = {},
+    reportUnusedDisableDirectives = null, // ← should be null by default because if it's a string then it overrides the 'reportUnusedDisableDirectives' setting in config files. And we cannot use `overrideConfig.reportUnusedDisableDirectives` instead because we cannot configure the `error` severity with that.
+    resolvePluginsRelativeTo = null, // ← should be null by default because if it's a string then it suppresses RFC47 feature.
+    rulePaths = [],
+    useEslintrc = true,
+    ...unknownOptions
+}) {
+    const errors = [];
+    const unknownOptionKeys = Object.keys(unknownOptions);
+
+    if (unknownOptionKeys.length >= 1) {
+        errors.push(`Unknown options: ${unknownOptionKeys.join(", ")}`);
+        if (unknownOptionKeys.includes("cacheFile")) {
+            errors.push("'cacheFile' has been removed. Please use the 'cacheLocation' option instead.");
+        }
+        if (unknownOptionKeys.includes("configFile")) {
+            errors.push("'configFile' has been removed. Please use the 'overrideConfigFile' option instead.");
+        }
+        if (unknownOptionKeys.includes("envs")) {
+            errors.push("'envs' has been removed. Please use the 'overrideConfig.env' option instead.");
+        }
+        if (unknownOptionKeys.includes("globals")) {
+            errors.push("'globals' has been removed. Please use the 'overrideConfig.globals' option instead.");
+        }
+        if (unknownOptionKeys.includes("ignorePattern")) {
+            errors.push("'ignorePattern' has been removed. Please use the 'overrideConfig.ignorePatterns' option instead.");
+        }
+        if (unknownOptionKeys.includes("parser")) {
+            errors.push("'parser' has been removed. Please use the 'overrideConfig.parser' option instead.");
+        }
+        if (unknownOptionKeys.includes("parserOptions")) {
+            errors.push("'parserOptions' has been removed. Please use the 'overrideConfig.parserOptions' option instead.");
+        }
+        if (unknownOptionKeys.includes("rules")) {
+            errors.push("'rules' has been removed. Please use the 'overrideConfig.rules' option instead.");
+        }
+    }
+    if (typeof allowInlineConfig !== "boolean") {
+        errors.push("'allowInlineConfig' must be a boolean.");
+    }
+    if (typeof baseConfig !== "object") {
+        errors.push("'baseConfig' must be an object or null.");
+    }
+    if (typeof cache !== "boolean") {
+        errors.push("'cache' must be a boolean.");
+    }
+    if (!isNonEmptyString(cacheLocation)) {
+        errors.push("'cacheLocation' must be a non-empty string.");
+    }
+    if (
+        cacheStrategy !== "metadata" &&
+        cacheStrategy !== "content"
+    ) {
+        errors.push("'cacheStrategy' must be any of \"metadata\", \"content\".");
+    }
+    if (!isNonEmptyString(cwd) || !path.isAbsolute(cwd)) {
+        errors.push("'cwd' must be an absolute path.");
+    }
+    if (typeof errorOnUnmatchedPattern !== "boolean") {
+        errors.push("'errorOnUnmatchedPattern' must be a boolean.");
+    }
+    if (!isArrayOfNonEmptyString(extensions) && extensions !== null) {
+        errors.push("'extensions' must be an array of non-empty strings or null.");
+    }
+    if (typeof fix !== "boolean" && typeof fix !== "function") {
+        errors.push("'fix' must be a boolean or a function.");
+    }
+    if (fixTypes !== null && !isFixTypeArray(fixTypes)) {
+        errors.push("'fixTypes' must be an array of any of \"problem\", \"suggestion\", and \"layout\".");
+    }
+    if (typeof globInputPaths !== "boolean") {
+        errors.push("'globInputPaths' must be a boolean.");
+    }
+    if (typeof ignore !== "boolean") {
+        errors.push("'ignore' must be a boolean.");
+    }
+    if (!isNonEmptyString(ignorePath) && ignorePath !== null) {
+        errors.push("'ignorePath' must be a non-empty string or null.");
+    }
+    if (typeof overrideConfig !== "object") {
+        errors.push("'overrideConfig' must be an object or null.");
+    }
+    if (!isNonEmptyString(overrideConfigFile) && overrideConfigFile !== null) {
+        errors.push("'overrideConfigFile' must be a non-empty string or null.");
+    }
+    if (typeof plugins !== "object") {
+        errors.push("'plugins' must be an object or null.");
+    } else if (plugins !== null && Object.keys(plugins).includes("")) {
+        errors.push("'plugins' must not include an empty string.");
+    }
+    if (Array.isArray(plugins)) {
+        errors.push("'plugins' doesn't add plugins to configuration to load. Please use the 'overrideConfig.plugins' option instead.");
+    }
+    if (
+        reportUnusedDisableDirectives !== "error" &&
+        reportUnusedDisableDirectives !== "warn" &&
+        reportUnusedDisableDirectives !== "off" &&
+        reportUnusedDisableDirectives !== null
+    ) {
+        errors.push("'reportUnusedDisableDirectives' must be any of \"error\", \"warn\", \"off\", and null.");
+    }
+    if (
+        !isNonEmptyString(resolvePluginsRelativeTo) &&
+        resolvePluginsRelativeTo !== null
+    ) {
+        errors.push("'resolvePluginsRelativeTo' must be a non-empty string or null.");
+    }
+    if (!isArrayOfNonEmptyString(rulePaths)) {
+        errors.push("'rulePaths' must be an array of non-empty strings.");
+    }
+    if (typeof useEslintrc !== "boolean") {
+        errors.push("'useEslintrc' must be a boolean.");
+    }
+
+    if (errors.length > 0) {
+        throw new ESLintInvalidOptionsError(errors);
+    }
+
+    return {
+        allowInlineConfig,
+        baseConfig,
+        cache,
+        cacheLocation,
+        cacheStrategy,
+        configFile: overrideConfigFile,
+        cwd,
+        errorOnUnmatchedPattern,
+        extensions,
+        fix,
+        fixTypes,
+        globInputPaths,
+        ignore,
+        ignorePath,
+        reportUnusedDisableDirectives,
+        resolvePluginsRelativeTo,
+        rulePaths,
+        useEslintrc
+    };
+}
+
+/**
+ * Check if a value has one or more properties and that value is not undefined.
+ * @param {any} obj The value to check.
+ * @returns {boolean} `true` if `obj` has one or more properties that that value is not undefined.
+ */
+function hasDefinedProperty(obj) {
+    if (typeof obj === "object" && obj !== null) {
+        for (const key in obj) {
+            if (typeof obj[key] !== "undefined") {
+                return true;
+            }
+        }
+    }
+    return false;
+}
+
+/**
+ * Create rulesMeta object.
+ * @param {Map<string,Rule>} rules a map of rules from which to generate the object.
+ * @returns {Object} metadata for all enabled rules.
+ */
+function createRulesMeta(rules) {
+    return Array.from(rules).reduce((retVal, [id, rule]) => {
+        retVal[id] = rule.meta;
+        return retVal;
+    }, {});
+}
+
+/** @type {WeakMap<ExtractedConfig, DeprecatedRuleInfo[]>} */
+const usedDeprecatedRulesCache = new WeakMap();
+
+/**
+ * Create used deprecated rule list.
+ * @param {CLIEngine} cliEngine The CLIEngine instance.
+ * @param {string} maybeFilePath The absolute path to a lint target file or `"<text>"`.
+ * @returns {DeprecatedRuleInfo[]} The used deprecated rule list.
+ */
+function getOrFindUsedDeprecatedRules(cliEngine, maybeFilePath) {
+    const {
+        configArrayFactory,
+        options: { cwd }
+    } = getCLIEngineInternalSlots(cliEngine);
+    const filePath = path.isAbsolute(maybeFilePath)
+        ? maybeFilePath
+        : path.join(cwd, "__placeholder__.js");
+    const configArray = configArrayFactory.getConfigArrayForFile(filePath);
+    const config = configArray.extractConfig(filePath);
+
+    // Most files use the same config, so cache it.
+    if (!usedDeprecatedRulesCache.has(config)) {
+        const pluginRules = configArray.pluginRules;
+        const retv = [];
+
+        for (const [ruleId, ruleConf] of Object.entries(config.rules)) {
+            if (getRuleSeverity(ruleConf) === 0) {
+                continue;
+            }
+            const rule = pluginRules.get(ruleId) || BuiltinRules.get(ruleId);
+            const meta = rule && rule.meta;
+
+            if (meta && meta.deprecated) {
+                retv.push({ ruleId, replacedBy: meta.replacedBy || [] });
+            }
+        }
+
+        usedDeprecatedRulesCache.set(config, Object.freeze(retv));
+    }
+
+    return usedDeprecatedRulesCache.get(config);
+}
+
+/**
+ * Processes the linting results generated by a CLIEngine linting report to
+ * match the ESLint class's API.
+ * @param {CLIEngine} cliEngine The CLIEngine instance.
+ * @param {CLIEngineLintReport} report The CLIEngine linting report to process.
+ * @returns {LintResult[]} The processed linting results.
+ */
+function processCLIEngineLintReport(cliEngine, { results }) {
+    const descriptor = {
+        configurable: true,
+        enumerable: true,
+        get() {
+            return getOrFindUsedDeprecatedRules(cliEngine, this.filePath);
+        }
+    };
+
+    for (const result of results) {
+        Object.defineProperty(result, "usedDeprecatedRules", descriptor);
+    }
+
+    return results;
+}
+
+/**
+ * An Array.prototype.sort() compatible compare function to order results by their file path.
+ * @param {LintResult} a The first lint result.
+ * @param {LintResult} b The second lint result.
+ * @returns {number} An integer representing the order in which the two results should occur.
+ */
+function compareResultsByFilePath(a, b) {
+    if (a.filePath < b.filePath) {
+        return -1;
+    }
+
+    if (a.filePath > b.filePath) {
+        return 1;
+    }
+
+    return 0;
+}
+
+class ESLint {
+
+    /**
+     * Creates a new instance of the main ESLint API.
+     * @param {ESLintOptions} options The options for this instance.
+     */
+    constructor(options = {}) {
+        const processedOptions = processOptions(options);
+        const cliEngine = new CLIEngine(processedOptions);
+        const {
+            additionalPluginPool,
+            configArrayFactory,
+            lastConfigArrays
+        } = getCLIEngineInternalSlots(cliEngine);
+        let updated = false;
+
+        /*
+         * Address `plugins` to add plugin implementations.
+         * Operate the `additionalPluginPool` internal slot directly to avoid
+         * using `addPlugin(id, plugin)` method that resets cache everytime.
+         */
+        if (options.plugins) {
+            for (const [id, plugin] of Object.entries(options.plugins)) {
+                additionalPluginPool.set(id, plugin);
+                updated = true;
+            }
+        }
+
+        /*
+         * Address `overrideConfig` to set override config.
+         * Operate the `configArrayFactory` internal slot directly because this
+         * functionality doesn't exist as the public API of CLIEngine.
+         */
+        if (hasDefinedProperty(options.overrideConfig)) {
+            configArrayFactory.setOverrideConfig(options.overrideConfig);
+            updated = true;
+        }
+
+        // Update caches.
+        if (updated) {
+            configArrayFactory.clearCache();
+            lastConfigArrays[0] = configArrayFactory.getConfigArrayForFile();
+        }
+
+        // Initialize private properties.
+        privateMembersMap.set(this, {
+            cliEngine,
+            options: processedOptions
+        });
+    }
+
+    /**
+     * The version text.
+     * @type {string}
+     */
+    static get version() {
+        return version;
+    }
+
+    /**
+     * Outputs fixes from the given results to files.
+     * @param {LintResult[]} results The lint results.
+     * @returns {Promise<void>} Returns a promise that is used to track side effects.
+     */
+    static async outputFixes(results) {
+        if (!Array.isArray(results)) {
+            throw new Error("'results' must be an array");
+        }
+
+        await Promise.all(
+            results
+                .filter(result => {
+                    if (typeof result !== "object" || result === null) {
+                        throw new Error("'results' must include only objects");
+                    }
+                    return (
+                        typeof result.output === "string" &&
+                        path.isAbsolute(result.filePath)
+                    );
+                })
+                .map(r => writeFile(r.filePath, r.output))
+        );
+    }
+
+    /**
+     * Returns results that only contains errors.
+     * @param {LintResult[]} results The results to filter.
+     * @returns {LintResult[]} The filtered results.
+     */
+    static getErrorResults(results) {
+        return CLIEngine.getErrorResults(results);
+    }
+
+    /**
+     * Returns meta objects for each rule represented in the lint results.
+     * @param {LintResult[]} results The results to fetch rules meta for.
+     * @returns {Object} A mapping of ruleIds to rule meta objects.
+     */
+    getRulesMetaForResults(results) {
+
+        const resultRuleIds = new Set();
+
+        // first gather all ruleIds from all results
+
+        for (const result of results) {
+            for (const { ruleId } of result.messages) {
+                resultRuleIds.add(ruleId);
+            }
+        }
+
+        // create a map of all rules in the results
+
+        const { cliEngine } = privateMembersMap.get(this);
+        const rules = cliEngine.getRules();
+        const resultRules = new Map();
+
+        for (const [ruleId, rule] of rules) {
+            if (resultRuleIds.has(ruleId)) {
+                resultRules.set(ruleId, rule);
+            }
+        }
+
+        return createRulesMeta(resultRules);
+
+    }
+
+    /**
+     * Executes the current configuration on an array of file and directory names.
+     * @param {string[]} patterns An array of file and directory names.
+     * @returns {Promise<LintResult[]>} The results of linting the file patterns given.
+     */
+    async lintFiles(patterns) {
+        if (!isNonEmptyString(patterns) && !isArrayOfNonEmptyString(patterns)) {
+            throw new Error("'patterns' must be a non-empty string or an array of non-empty strings");
+        }
+        const { cliEngine } = privateMembersMap.get(this);
+
+        return processCLIEngineLintReport(
+            cliEngine,
+            cliEngine.executeOnFiles(patterns)
+        );
+    }
+
+    /**
+     * Executes the current configuration on text.
+     * @param {string} code A string of JavaScript code to lint.
+     * @param {Object} [options] The options.
+     * @param {string} [options.filePath] The path to the file of the source code.
+     * @param {boolean} [options.warnIgnored] When set to true, warn if given filePath is an ignored path.
+     * @returns {Promise<LintResult[]>} The results of linting the string of code given.
+     */
+    async lintText(code, options = {}) {
+        if (typeof code !== "string") {
+            throw new Error("'code' must be a string");
+        }
+        if (typeof options !== "object") {
+            throw new Error("'options' must be an object, null, or undefined");
+        }
+        const {
+            filePath,
+            warnIgnored = false,
+            ...unknownOptions
+        } = options || {};
+
+        const unknownOptionKeys = Object.keys(unknownOptions);
+
+        if (unknownOptionKeys.length > 0) {
+            throw new Error(`'options' must not include the unknown option(s): ${unknownOptionKeys.join(", ")}`);
+        }
+
+        if (filePath !== void 0 && !isNonEmptyString(filePath)) {
+            throw new Error("'options.filePath' must be a non-empty string or undefined");
+        }
+        if (typeof warnIgnored !== "boolean") {
+            throw new Error("'options.warnIgnored' must be a boolean or undefined");
+        }
+
+        const { cliEngine } = privateMembersMap.get(this);
+
+        return processCLIEngineLintReport(
+            cliEngine,
+            cliEngine.executeOnText(code, filePath, warnIgnored)
+        );
+    }
+
+    /**
+     * Returns the formatter representing the given formatter name.
+     * @param {string} [name] The name of the formatter to load.
+     * The following values are allowed:
+     * - `undefined` ... Load `stylish` builtin formatter.
+     * - A builtin formatter name ... Load the builtin formatter.
+     * - A thirdparty formatter name:
+     *   - `foo` → `eslint-formatter-foo`
+     *   - `@foo` → `@foo/eslint-formatter`
+     *   - `@foo/bar` → `@foo/eslint-formatter-bar`
+     * - A file path ... Load the file.
+     * @returns {Promise<Formatter>} A promise resolving to the formatter object.
+     * This promise will be rejected if the given formatter was not found or not
+     * a function.
+     */
+    async loadFormatter(name = "stylish") {
+        if (typeof name !== "string") {
+            throw new Error("'name' must be a string");
+        }
+
+        const { cliEngine } = privateMembersMap.get(this);
+        const formatter = cliEngine.getFormatter(name);
+
+        if (typeof formatter !== "function") {
+            throw new Error(`Formatter must be a function, but got a ${typeof formatter}.`);
+        }
+
+        return {
+
+            /**
+             * The main formatter method.
+             * @param {LintResults[]} results The lint results to format.
+             * @returns {string} The formatted lint results.
+             */
+            format(results) {
+                let rulesMeta = null;
+
+                results.sort(compareResultsByFilePath);
+
+                return formatter(results, {
+                    get rulesMeta() {
+                        if (!rulesMeta) {
+                            rulesMeta = createRulesMeta(cliEngine.getRules());
+                        }
+
+                        return rulesMeta;
+                    }
+                });
+            }
+        };
+    }
+
+    /**
+     * Returns a configuration object for the given file based on the CLI options.
+     * This is the same logic used by the ESLint CLI executable to determine
+     * configuration for each file it processes.
+     * @param {string} filePath The path of the file to retrieve a config object for.
+     * @returns {Promise<ConfigData>} A configuration object for the file.
+     */
+    async calculateConfigForFile(filePath) {
+        if (!isNonEmptyString(filePath)) {
+            throw new Error("'filePath' must be a non-empty string");
+        }
+        const { cliEngine } = privateMembersMap.get(this);
+
+        return cliEngine.getConfigForFile(filePath);
+    }
+
+    /**
+     * Checks if a given path is ignored by ESLint.
+     * @param {string} filePath The path of the file to check.
+     * @returns {Promise<boolean>} Whether or not the given path is ignored.
+     */
+    async isPathIgnored(filePath) {
+        if (!isNonEmptyString(filePath)) {
+            throw new Error("'filePath' must be a non-empty string");
+        }
+        const { cliEngine } = privateMembersMap.get(this);
+
+        return cliEngine.isPathIgnored(filePath);
+    }
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = {
+    ESLint,
+
+    /**
+     * Get the private class members of a given ESLint instance for tests.
+     * @param {ESLint} instance The ESLint instance to get.
+     * @returns {ESLintPrivateMembers} The instance's private class members.
+     */
+    getESLintPrivateMembers(instance) {
+        return privateMembersMap.get(instance);
+    }
+};

node_modules/eslint/lib/eslint/index.js

@@ -0,0 +1,7 @@
+"use strict";
+
+const { ESLint } = require("./eslint");
+
+module.exports = {
+    ESLint
+};

node_modules/eslint/lib/init/autoconfig.js

@@ -0,0 +1,348 @@
+/**
+ * @fileoverview Used for creating a suggested configuration based on project code.
+ * @author Ian VanSchooten
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const equal = require("fast-deep-equal"),
+    recConfig = require("../../conf/eslint-recommended"),
+    ConfigOps = require("@eslint/eslintrc/lib/shared/config-ops"),
+    { Linter } = require("../linter"),
+    configRule = require("./config-rule");
+
+const debug = require("debug")("eslint:autoconfig");
+const linter = new Linter();
+
+//------------------------------------------------------------------------------
+// Data
+//------------------------------------------------------------------------------
+
+const MAX_CONFIG_COMBINATIONS = 17, // 16 combinations + 1 for severity only
+    RECOMMENDED_CONFIG_NAME = "eslint:recommended";
+
+//------------------------------------------------------------------------------
+// Private
+//------------------------------------------------------------------------------
+
+/**
+ * Information about a rule configuration, in the context of a Registry.
+ * @typedef {Object}     registryItem
+ * @param   {ruleConfig} config        A valid configuration for the rule
+ * @param   {number}     specificity   The number of elements in the ruleConfig array
+ * @param   {number}     errorCount    The number of errors encountered when linting with the config
+ */
+
+/**
+ * This callback is used to measure execution status in a progress bar
+ * @callback progressCallback
+ * @param {number} The total number of times the callback will be called.
+ */
+
+/**
+ * Create registryItems for rules
+ * @param   {rulesConfig} rulesConfig Hash of rule names and arrays of ruleConfig items
+ * @returns {Object}                  registryItems for each rule in provided rulesConfig
+ */
+function makeRegistryItems(rulesConfig) {
+    return Object.keys(rulesConfig).reduce((accumulator, ruleId) => {
+        accumulator[ruleId] = rulesConfig[ruleId].map(config => ({
+            config,
+            specificity: config.length || 1,
+            errorCount: void 0
+        }));
+        return accumulator;
+    }, {});
+}
+
+/**
+ * Creates an object in which to store rule configs and error counts
+ *
+ * Unless a rulesConfig is provided at construction, the registry will not contain
+ * any rules, only methods.  This will be useful for building up registries manually.
+ *
+ * Registry class
+ */
+class Registry {
+
+    // eslint-disable-next-line jsdoc/require-description
+    /**
+     * @param {rulesConfig} [rulesConfig] Hash of rule names and arrays of possible configurations
+     */
+    constructor(rulesConfig) {
+        this.rules = (rulesConfig) ? makeRegistryItems(rulesConfig) : {};
+    }
+
+    /**
+     * Populate the registry with core rule configs.
+     *
+     * It will set the registry's `rule` property to an object having rule names
+     * as keys and an array of registryItems as values.
+     * @returns {void}
+     */
+    populateFromCoreRules() {
+        const rulesConfig = configRule.createCoreRuleConfigs(/* noDeprecated = */ true);
+
+        this.rules = makeRegistryItems(rulesConfig);
+    }
+
+    /**
+     * Creates sets of rule configurations which can be used for linting
+     * and initializes registry errors to zero for those configurations (side effect).
+     *
+     * This combines as many rules together as possible, such that the first sets
+     * in the array will have the highest number of rules configured, and later sets
+     * will have fewer and fewer, as not all rules have the same number of possible
+     * configurations.
+     *
+     * The length of the returned array will be <= MAX_CONFIG_COMBINATIONS.
+     * @returns {Object[]}          "rules" configurations to use for linting
+     */
+    buildRuleSets() {
+        let idx = 0;
+        const ruleIds = Object.keys(this.rules),
+            ruleSets = [];
+
+        /**
+         * Add a rule configuration from the registry to the ruleSets
+         *
+         * This is broken out into its own function so that it doesn't need to be
+         * created inside of the while loop.
+         * @param   {string} rule The ruleId to add.
+         * @returns {void}
+         */
+        const addRuleToRuleSet = function(rule) {
+
+            /*
+             * This check ensures that there is a rule configuration and that
+             * it has fewer than the max combinations allowed.
+             * If it has too many configs, we will only use the most basic of
+             * the possible configurations.
+             */
+            const hasFewCombos = (this.rules[rule].length <= MAX_CONFIG_COMBINATIONS);
+
+            if (this.rules[rule][idx] && (hasFewCombos || this.rules[rule][idx].specificity <= 2)) {
+
+                /*
+                 * If the rule has too many possible combinations, only take
+                 * simple ones, avoiding objects.
+                 */
+                if (!hasFewCombos && typeof this.rules[rule][idx].config[1] === "object") {
+                    return;
+                }
+
+                ruleSets[idx] = ruleSets[idx] || {};
+                ruleSets[idx][rule] = this.rules[rule][idx].config;
+
+                /*
+                 * Initialize errorCount to zero, since this is a config which
+                 * will be linted.
+                 */
+                this.rules[rule][idx].errorCount = 0;
+            }
+        }.bind(this);
+
+        while (ruleSets.length === idx) {
+            ruleIds.forEach(addRuleToRuleSet);
+            idx += 1;
+        }
+
+        return ruleSets;
+    }
+
+    /**
+     * Remove all items from the registry with a non-zero number of errors
+     *
+     * Note: this also removes rule configurations which were not linted
+     * (meaning, they have an undefined errorCount).
+     * @returns {void}
+     */
+    stripFailingConfigs() {
+        const ruleIds = Object.keys(this.rules),
+            newRegistry = new Registry();
+
+        newRegistry.rules = Object.assign({}, this.rules);
+        ruleIds.forEach(ruleId => {
+            const errorFreeItems = newRegistry.rules[ruleId].filter(registryItem => (registryItem.errorCount === 0));
+
+            if (errorFreeItems.length > 0) {
+                newRegistry.rules[ruleId] = errorFreeItems;
+            } else {
+                delete newRegistry.rules[ruleId];
+            }
+        });
+
+        return newRegistry;
+    }
+
+    /**
+     * Removes rule configurations which were not included in a ruleSet
+     * @returns {void}
+     */
+    stripExtraConfigs() {
+        const ruleIds = Object.keys(this.rules),
+            newRegistry = new Registry();
+
+        newRegistry.rules = Object.assign({}, this.rules);
+        ruleIds.forEach(ruleId => {
+            newRegistry.rules[ruleId] = newRegistry.rules[ruleId].filter(registryItem => (typeof registryItem.errorCount !== "undefined"));
+        });
+
+        return newRegistry;
+    }
+
+    /**
+     * Creates a registry of rules which had no error-free configs.
+     * The new registry is intended to be analyzed to determine whether its rules
+     * should be disabled or set to warning.
+     * @returns {Registry}  A registry of failing rules.
+     */
+    getFailingRulesRegistry() {
+        const ruleIds = Object.keys(this.rules),
+            failingRegistry = new Registry();
+
+        ruleIds.forEach(ruleId => {
+            const failingConfigs = this.rules[ruleId].filter(registryItem => (registryItem.errorCount > 0));
+
+            if (failingConfigs && failingConfigs.length === this.rules[ruleId].length) {
+                failingRegistry.rules[ruleId] = failingConfigs;
+            }
+        });
+
+        return failingRegistry;
+    }
+
+    /**
+     * Create an eslint config for any rules which only have one configuration
+     * in the registry.
+     * @returns {Object} An eslint config with rules section populated
+     */
+    createConfig() {
+        const ruleIds = Object.keys(this.rules),
+            config = { rules: {} };
+
+        ruleIds.forEach(ruleId => {
+            if (this.rules[ruleId].length === 1) {
+                config.rules[ruleId] = this.rules[ruleId][0].config;
+            }
+        });
+
+        return config;
+    }
+
+    /**
+     * Return a cloned registry containing only configs with a desired specificity
+     * @param   {number} specificity Only keep configs with this specificity
+     * @returns {Registry}           A registry of rules
+     */
+    filterBySpecificity(specificity) {
+        const ruleIds = Object.keys(this.rules),
+            newRegistry = new Registry();
+
+        newRegistry.rules = Object.assign({}, this.rules);
+        ruleIds.forEach(ruleId => {
+            newRegistry.rules[ruleId] = this.rules[ruleId].filter(registryItem => (registryItem.specificity === specificity));
+        });
+
+        return newRegistry;
+    }
+
+    /**
+     * Lint SourceCodes against all configurations in the registry, and record results
+     * @param   {Object[]} sourceCodes  SourceCode objects for each filename
+     * @param   {Object}   config       ESLint config object
+     * @param   {progressCallback} [cb] Optional callback for reporting execution status
+     * @returns {Registry}              New registry with errorCount populated
+     */
+    lintSourceCode(sourceCodes, config, cb) {
+        let lintedRegistry = new Registry();
+
+        lintedRegistry.rules = Object.assign({}, this.rules);
+
+        const ruleSets = lintedRegistry.buildRuleSets();
+
+        lintedRegistry = lintedRegistry.stripExtraConfigs();
+
+        debug("Linting with all possible rule combinations");
+
+        const filenames = Object.keys(sourceCodes);
+        const totalFilesLinting = filenames.length * ruleSets.length;
+
+        filenames.forEach(filename => {
+            debug(`Linting file: ${filename}`);
+
+            let ruleSetIdx = 0;
+
+            ruleSets.forEach(ruleSet => {
+                const lintConfig = Object.assign({}, config, { rules: ruleSet });
+                const lintResults = linter.verify(sourceCodes[filename], lintConfig);
+
+                lintResults.forEach(result => {
+
+                    /*
+                     * It is possible that the error is from a configuration comment
+                     * in a linted file, in which case there may not be a config
+                     * set in this ruleSetIdx.
+                     * (https://github.com/eslint/eslint/issues/5992)
+                     * (https://github.com/eslint/eslint/issues/7860)
+                     */
+                    if (
+                        lintedRegistry.rules[result.ruleId] &&
+                        lintedRegistry.rules[result.ruleId][ruleSetIdx]
+                    ) {
+                        lintedRegistry.rules[result.ruleId][ruleSetIdx].errorCount += 1;
+                    }
+                });
+
+                ruleSetIdx += 1;
+
+                if (cb) {
+                    cb(totalFilesLinting); // eslint-disable-line node/callback-return
+                }
+            });
+
+            // Deallocate for GC
+            sourceCodes[filename] = null;
+        });
+
+        return lintedRegistry;
+    }
+}
+
+/**
+ * Extract rule configuration into eslint:recommended where possible.
+ *
+ * This will return a new config with `["extends": [ ..., "eslint:recommended"]` and
+ * only the rules which have configurations different from the recommended config.
+ * @param   {Object} config config object
+ * @returns {Object}        config object using `"extends": ["eslint:recommended"]`
+ */
+function extendFromRecommended(config) {
+    const newConfig = Object.assign({}, config);
+
+    ConfigOps.normalizeToStrings(newConfig);
+
+    const recRules = Object.keys(recConfig.rules).filter(ruleId => ConfigOps.isErrorSeverity(recConfig.rules[ruleId]));
+
+    recRules.forEach(ruleId => {
+        if (equal(recConfig.rules[ruleId], newConfig.rules[ruleId])) {
+            delete newConfig.rules[ruleId];
+        }
+    });
+    newConfig.extends.unshift(RECOMMENDED_CONFIG_NAME);
+    return newConfig;
+}
+
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = {
+    Registry,
+    extendFromRecommended
+};

node_modules/eslint/lib/init/config-file.js

@@ -0,0 +1,144 @@
+/**
+ * @fileoverview Helper to locate and load configuration files.
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const fs = require("fs"),
+    path = require("path"),
+    stringify = require("json-stable-stringify-without-jsonify");
+
+const debug = require("debug")("eslint:config-file");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Determines sort order for object keys for json-stable-stringify
+ *
+ * see: https://github.com/samn/json-stable-stringify#cmp
+ * @param   {Object} a The first comparison object ({key: akey, value: avalue})
+ * @param   {Object} b The second comparison object ({key: bkey, value: bvalue})
+ * @returns {number}   1 or -1, used in stringify cmp method
+ */
+function sortByKey(a, b) {
+    return a.key > b.key ? 1 : -1;
+}
+
+//------------------------------------------------------------------------------
+// Private
+//------------------------------------------------------------------------------
+
+/**
+ * Writes a configuration file in JSON format.
+ * @param {Object} config The configuration object to write.
+ * @param {string} filePath The filename to write to.
+ * @returns {void}
+ * @private
+ */
+function writeJSONConfigFile(config, filePath) {
+    debug(`Writing JSON config file: ${filePath}`);
+
+    const content = `${stringify(config, { cmp: sortByKey, space: 4 })}\n`;
+
+    fs.writeFileSync(filePath, content, "utf8");
+}
+
+/**
+ * Writes a configuration file in YAML format.
+ * @param {Object} config The configuration object to write.
+ * @param {string} filePath The filename to write to.
+ * @returns {void}
+ * @private
+ */
+function writeYAMLConfigFile(config, filePath) {
+    debug(`Writing YAML config file: ${filePath}`);
+
+    // lazy load YAML to improve performance when not used
+    const yaml = require("js-yaml");
+
+    const content = yaml.safeDump(config, { sortKeys: true });
+
+    fs.writeFileSync(filePath, content, "utf8");
+}
+
+/**
+ * Writes a configuration file in JavaScript format.
+ * @param {Object} config The configuration object to write.
+ * @param {string} filePath The filename to write to.
+ * @throws {Error} If an error occurs linting the config file contents.
+ * @returns {void}
+ * @private
+ */
+function writeJSConfigFile(config, filePath) {
+    debug(`Writing JS config file: ${filePath}`);
+
+    let contentToWrite;
+    const stringifiedContent = `module.exports = ${stringify(config, { cmp: sortByKey, space: 4 })};\n`;
+
+    try {
+        const { CLIEngine } = require("../cli-engine");
+        const linter = new CLIEngine({
+            baseConfig: config,
+            fix: true,
+            useEslintrc: false
+        });
+        const report = linter.executeOnText(stringifiedContent);
+
+        contentToWrite = report.results[0].output || stringifiedContent;
+    } catch (e) {
+        debug("Error linting JavaScript config file, writing unlinted version");
+        const errorMessage = e.message;
+
+        contentToWrite = stringifiedContent;
+        e.message = "An error occurred while generating your JavaScript config file. ";
+        e.message += "A config file was still generated, but the config file itself may not follow your linting rules.";
+        e.message += `\nError: ${errorMessage}`;
+        throw e;
+    } finally {
+        fs.writeFileSync(filePath, contentToWrite, "utf8");
+    }
+}
+
+/**
+ * Writes a configuration file.
+ * @param {Object} config The configuration object to write.
+ * @param {string} filePath The filename to write to.
+ * @returns {void}
+ * @throws {Error} When an unknown file type is specified.
+ * @private
+ */
+function write(config, filePath) {
+    switch (path.extname(filePath)) {
+        case ".js":
+        case ".cjs":
+            writeJSConfigFile(config, filePath);
+            break;
+
+        case ".json":
+            writeJSONConfigFile(config, filePath);
+            break;
+
+        case ".yaml":
+        case ".yml":
+            writeYAMLConfigFile(config, filePath);
+            break;
+
+        default:
+            throw new Error("Can't write to unknown file type.");
+    }
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = {
+    write
+};

node_modules/eslint/lib/init/config-initializer.js

@@ -0,0 +1,704 @@
+/**
+ * @fileoverview Config initialization wizard.
+ * @author Ilya Volodin
+ */
+
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const util = require("util"),
+    path = require("path"),
+    fs = require("fs"),
+    enquirer = require("enquirer"),
+    ProgressBar = require("progress"),
+    semver = require("semver"),
+    espree = require("espree"),
+    recConfig = require("../../conf/eslint-recommended"),
+    ConfigOps = require("@eslint/eslintrc/lib/shared/config-ops"),
+    log = require("../shared/logging"),
+    naming = require("@eslint/eslintrc/lib/shared/naming"),
+    ModuleResolver = require("../shared/relative-module-resolver"),
+    autoconfig = require("./autoconfig.js"),
+    ConfigFile = require("./config-file"),
+    npmUtils = require("./npm-utils"),
+    { getSourceCodeOfFiles } = require("./source-code-utils");
+
+const debug = require("debug")("eslint:config-initializer");
+
+//------------------------------------------------------------------------------
+// Private
+//------------------------------------------------------------------------------
+
+/* istanbul ignore next: hard to test fs function */
+/**
+ * Create .eslintrc file in the current working directory
+ * @param {Object} config object that contains user's answers
+ * @param {string} format The file format to write to.
+ * @returns {void}
+ */
+function writeFile(config, format) {
+
+    // default is .js
+    let extname = ".js";
+
+    if (format === "YAML") {
+        extname = ".yml";
+    } else if (format === "JSON") {
+        extname = ".json";
+    } else if (format === "JavaScript") {
+        const pkgJSONPath = npmUtils.findPackageJson();
+
+        if (pkgJSONPath) {
+            const pkgJSONContents = JSON.parse(fs.readFileSync(pkgJSONPath, "utf8"));
+
+            if (pkgJSONContents.type === "module") {
+                extname = ".cjs";
+            }
+        }
+    }
+
+    const installedESLint = config.installedESLint;
+
+    delete config.installedESLint;
+
+    ConfigFile.write(config, `./.eslintrc${extname}`);
+    log.info(`Successfully created .eslintrc${extname} file in ${process.cwd()}`);
+
+    if (installedESLint) {
+        log.info("ESLint was installed locally. We recommend using this local copy instead of your globally-installed copy.");
+    }
+}
+
+/**
+ * Get the peer dependencies of the given module.
+ * This adds the gotten value to cache at the first time, then reuses it.
+ * In a process, this function is called twice, but `npmUtils.fetchPeerDependencies` needs to access network which is relatively slow.
+ * @param {string} moduleName The module name to get.
+ * @returns {Object} The peer dependencies of the given module.
+ * This object is the object of `peerDependencies` field of `package.json`.
+ * Returns null if npm was not found.
+ */
+function getPeerDependencies(moduleName) {
+    let result = getPeerDependencies.cache.get(moduleName);
+
+    if (!result) {
+        log.info(`Checking peerDependencies of ${moduleName}`);
+
+        result = npmUtils.fetchPeerDependencies(moduleName);
+        getPeerDependencies.cache.set(moduleName, result);
+    }
+
+    return result;
+}
+getPeerDependencies.cache = new Map();
+
+/**
+ * Return necessary plugins, configs, parsers, etc. based on the config
+ * @param   {Object} config  config object
+ * @param   {boolean} [installESLint=true]  If `false` is given, it does not install eslint.
+ * @returns {string[]} An array of modules to be installed.
+ */
+function getModulesList(config, installESLint) {
+    const modules = {};
+
+    // Create a list of modules which should be installed based on config
+    if (config.plugins) {
+        for (const plugin of config.plugins) {
+            const moduleName = naming.normalizePackageName(plugin, "eslint-plugin");
+
+            modules[moduleName] = "latest";
+        }
+    }
+    if (config.extends) {
+        const extendList = Array.isArray(config.extends) ? config.extends : [config.extends];
+
+        for (const extend of extendList) {
+            if (extend.startsWith("eslint:") || extend.startsWith("plugin:")) {
+                continue;
+            }
+            const moduleName = naming.normalizePackageName(extend, "eslint-config");
+
+            modules[moduleName] = "latest";
+            Object.assign(
+                modules,
+                getPeerDependencies(`${moduleName}@latest`)
+            );
+        }
+    }
+
+    const parser = config.parser || (config.parserOptions && config.parserOptions.parser);
+
+    if (parser) {
+        modules[parser] = "latest";
+    }
+
+    if (installESLint === false) {
+        delete modules.eslint;
+    } else {
+        const installStatus = npmUtils.checkDevDeps(["eslint"]);
+
+        // Mark to show messages if it's new installation of eslint.
+        if (installStatus.eslint === false) {
+            log.info("Local ESLint installation not found.");
+            modules.eslint = modules.eslint || "latest";
+            config.installedESLint = true;
+        }
+    }
+
+    return Object.keys(modules).map(name => `${name}@${modules[name]}`);
+}
+
+/**
+ * Set the `rules` of a config by examining a user's source code
+ *
+ * Note: This clones the config object and returns a new config to avoid mutating
+ * the original config parameter.
+ * @param   {Object} answers  answers received from enquirer
+ * @param   {Object} config   config object
+ * @returns {Object}          config object with configured rules
+ */
+function configureRules(answers, config) {
+    const BAR_TOTAL = 20,
+        BAR_SOURCE_CODE_TOTAL = 4,
+        newConfig = Object.assign({}, config),
+        disabledConfigs = {};
+    let sourceCodes,
+        registry;
+
+    // Set up a progress bar, as this process can take a long time
+    const bar = new ProgressBar("Determining Config: :percent [:bar] :elapseds elapsed, eta :etas ", {
+        width: 30,
+        total: BAR_TOTAL
+    });
+
+    bar.tick(0); // Shows the progress bar
+
+    // Get the SourceCode of all chosen files
+    const patterns = answers.patterns.split(/[\s]+/u);
+
+    try {
+        sourceCodes = getSourceCodeOfFiles(patterns, { baseConfig: newConfig, useEslintrc: false }, total => {
+            bar.tick((BAR_SOURCE_CODE_TOTAL / total));
+        });
+    } catch (e) {
+        log.info("\n");
+        throw e;
+    }
+    const fileQty = Object.keys(sourceCodes).length;
+
+    if (fileQty === 0) {
+        log.info("\n");
+        throw new Error("Automatic Configuration failed.  No files were able to be parsed.");
+    }
+
+    // Create a registry of rule configs
+    registry = new autoconfig.Registry();
+    registry.populateFromCoreRules();
+
+    // Lint all files with each rule config in the registry
+    registry = registry.lintSourceCode(sourceCodes, newConfig, total => {
+        bar.tick((BAR_TOTAL - BAR_SOURCE_CODE_TOTAL) / total); // Subtract out ticks used at beginning
+    });
+    debug(`\nRegistry: ${util.inspect(registry.rules, { depth: null })}`);
+
+    // Create a list of recommended rules, because we don't want to disable them
+    const recRules = Object.keys(recConfig.rules).filter(ruleId => ConfigOps.isErrorSeverity(recConfig.rules[ruleId]));
+
+    // Find and disable rules which had no error-free configuration
+    const failingRegistry = registry.getFailingRulesRegistry();
+
+    Object.keys(failingRegistry.rules).forEach(ruleId => {
+
+        // If the rule is recommended, set it to error, otherwise disable it
+        disabledConfigs[ruleId] = (recRules.indexOf(ruleId) !== -1) ? 2 : 0;
+    });
+
+    // Now that we know which rules to disable, strip out configs with errors
+    registry = registry.stripFailingConfigs();
+
+    /*
+     * If there is only one config that results in no errors for a rule, we should use it.
+     * createConfig will only add rules that have one configuration in the registry.
+     */
+    const singleConfigs = registry.createConfig().rules;
+
+    /*
+     * The "sweet spot" for number of options in a config seems to be two (severity plus one option).
+     * Very often, a third option (usually an object) is available to address
+     * edge cases, exceptions, or unique situations. We will prefer to use a config with
+     * specificity of two.
+     */
+    const specTwoConfigs = registry.filterBySpecificity(2).createConfig().rules;
+
+    // Maybe a specific combination using all three options works
+    const specThreeConfigs = registry.filterBySpecificity(3).createConfig().rules;
+
+    // If all else fails, try to use the default (severity only)
+    const defaultConfigs = registry.filterBySpecificity(1).createConfig().rules;
+
+    // Combine configs in reverse priority order (later take precedence)
+    newConfig.rules = Object.assign({}, disabledConfigs, defaultConfigs, specThreeConfigs, specTwoConfigs, singleConfigs);
+
+    // Make sure progress bar has finished (floating point rounding)
+    bar.update(BAR_TOTAL);
+
+    // Log out some stats to let the user know what happened
+    const finalRuleIds = Object.keys(newConfig.rules);
+    const totalRules = finalRuleIds.length;
+    const enabledRules = finalRuleIds.filter(ruleId => (newConfig.rules[ruleId] !== 0)).length;
+    const resultMessage = [
+        `\nEnabled ${enabledRules} out of ${totalRules}`,
+        `rules based on ${fileQty}`,
+        `file${(fileQty === 1) ? "." : "s."}`
+    ].join(" ");
+
+    log.info(resultMessage);
+
+    ConfigOps.normalizeToStrings(newConfig);
+    return newConfig;
+}
+
+/**
+ * process user's answers and create config object
+ * @param {Object} answers answers received from enquirer
+ * @returns {Object} config object
+ */
+function processAnswers(answers) {
+    let config = {
+        rules: {},
+        env: {},
+        parserOptions: {},
+        extends: []
+    };
+
+    config.parserOptions.ecmaVersion = espree.latestEcmaVersion;
+    config.env.es2021 = true;
+
+    // set the module type
+    if (answers.moduleType === "esm") {
+        config.parserOptions.sourceType = "module";
+    } else if (answers.moduleType === "commonjs") {
+        config.env.commonjs = true;
+    }
+
+    // add in browser and node environments if necessary
+    answers.env.forEach(env => {
+        config.env[env] = true;
+    });
+
+    // add in library information
+    if (answers.framework === "react") {
+        config.parserOptions.ecmaFeatures = {
+            jsx: true
+        };
+        config.plugins = ["react"];
+        config.extends.push("plugin:react/recommended");
+    } else if (answers.framework === "vue") {
+        config.plugins = ["vue"];
+        config.extends.push("plugin:vue/essential");
+    }
+
+    if (answers.typescript) {
+        if (answers.framework === "vue") {
+            config.parserOptions.parser = "@typescript-eslint/parser";
+        } else {
+            config.parser = "@typescript-eslint/parser";
+        }
+
+        if (Array.isArray(config.plugins)) {
+            config.plugins.push("@typescript-eslint");
+        } else {
+            config.plugins = ["@typescript-eslint"];
+        }
+    }
+
+    // setup rules based on problems/style enforcement preferences
+    if (answers.purpose === "problems") {
+        config.extends.unshift("eslint:recommended");
+    } else if (answers.purpose === "style") {
+        if (answers.source === "prompt") {
+            config.extends.unshift("eslint:recommended");
+            config.rules.indent = ["error", answers.indent];
+            config.rules.quotes = ["error", answers.quotes];
+            config.rules["linebreak-style"] = ["error", answers.linebreak];
+            config.rules.semi = ["error", answers.semi ? "always" : "never"];
+        } else if (answers.source === "auto") {
+            config = configureRules(answers, config);
+            config = autoconfig.extendFromRecommended(config);
+        }
+    }
+    if (answers.typescript && config.extends.includes("eslint:recommended")) {
+        config.extends.push("plugin:@typescript-eslint/recommended");
+    }
+
+    // normalize extends
+    if (config.extends.length === 0) {
+        delete config.extends;
+    } else if (config.extends.length === 1) {
+        config.extends = config.extends[0];
+    }
+
+    ConfigOps.normalizeToStrings(config);
+    return config;
+}
+
+/**
+ * Get the version of the local ESLint.
+ * @returns {string|null} The version. If the local ESLint was not found, returns null.
+ */
+function getLocalESLintVersion() {
+    try {
+        const eslintPath = ModuleResolver.resolve("eslint", path.join(process.cwd(), "__placeholder__.js"));
+        const eslint = require(eslintPath);
+
+        return eslint.linter.version || null;
+    } catch {
+        return null;
+    }
+}
+
+/**
+ * Get the shareable config name of the chosen style guide.
+ * @param {Object} answers The answers object.
+ * @returns {string} The shareable config name.
+ */
+function getStyleGuideName(answers) {
+    if (answers.styleguide === "airbnb" && answers.framework !== "react") {
+        return "airbnb-base";
+    }
+    return answers.styleguide;
+}
+
+/**
+ * Check whether the local ESLint version conflicts with the required version of the chosen shareable config.
+ * @param {Object} answers The answers object.
+ * @returns {boolean} `true` if the local ESLint is found then it conflicts with the required version of the chosen shareable config.
+ */
+function hasESLintVersionConflict(answers) {
+
+    // Get the local ESLint version.
+    const localESLintVersion = getLocalESLintVersion();
+
+    if (!localESLintVersion) {
+        return false;
+    }
+
+    // Get the required range of ESLint version.
+    const configName = getStyleGuideName(answers);
+    const moduleName = `eslint-config-${configName}@latest`;
+    const peerDependencies = getPeerDependencies(moduleName) || {};
+    const requiredESLintVersionRange = peerDependencies.eslint;
+
+    if (!requiredESLintVersionRange) {
+        return false;
+    }
+
+    answers.localESLintVersion = localESLintVersion;
+    answers.requiredESLintVersionRange = requiredESLintVersionRange;
+
+    // Check the version.
+    if (semver.satisfies(localESLintVersion, requiredESLintVersionRange)) {
+        answers.installESLint = false;
+        return false;
+    }
+
+    return true;
+}
+
+/**
+ * Install modules.
+ * @param   {string[]} modules Modules to be installed.
+ * @returns {void}
+ */
+function installModules(modules) {
+    log.info(`Installing ${modules.join(", ")}`);
+    npmUtils.installSyncSaveDev(modules);
+}
+
+/* istanbul ignore next: no need to test enquirer */
+/**
+ * Ask user to install modules.
+ * @param   {string[]} modules Array of modules to be installed.
+ * @param   {boolean} packageJsonExists Indicates if package.json is existed.
+ * @returns {Promise} Answer that indicates if user wants to install.
+ */
+function askInstallModules(modules, packageJsonExists) {
+
+    // If no modules, do nothing.
+    if (modules.length === 0) {
+        return Promise.resolve();
+    }
+
+    log.info("The config that you've selected requires the following dependencies:\n");
+    log.info(modules.join(" "));
+    return enquirer.prompt([
+        {
+            type: "toggle",
+            name: "executeInstallation",
+            message: "Would you like to install them now with npm?",
+            enabled: "Yes",
+            disabled: "No",
+            initial: 1,
+            skip() {
+                return !(modules.length && packageJsonExists);
+            },
+            result(input) {
+                return this.skipped ? null : input;
+            }
+        }
+    ]).then(({ executeInstallation }) => {
+        if (executeInstallation) {
+            installModules(modules);
+        }
+    });
+}
+
+/* istanbul ignore next: no need to test enquirer */
+/**
+ * Ask use a few questions on command prompt
+ * @returns {Promise} The promise with the result of the prompt
+ */
+function promptUser() {
+
+    return enquirer.prompt([
+        {
+            type: "select",
+            name: "purpose",
+            message: "How would you like to use ESLint?",
+
+            // The returned number matches the name value of nth in the choices array.
+            initial: 1,
+            choices: [
+                { message: "To check syntax only", name: "syntax" },
+                { message: "To check syntax and find problems", name: "problems" },
+                { message: "To check syntax, find problems, and enforce code style", name: "style" }
+            ]
+        },
+        {
+            type: "select",
+            name: "moduleType",
+            message: "What type of modules does your project use?",
+            initial: 0,
+            choices: [
+                { message: "JavaScript modules (import/export)", name: "esm" },
+                { message: "CommonJS (require/exports)", name: "commonjs" },
+                { message: "None of these", name: "none" }
+            ]
+        },
+        {
+            type: "select",
+            name: "framework",
+            message: "Which framework does your project use?",
+            initial: 0,
+            choices: [
+                { message: "React", name: "react" },
+                { message: "Vue.js", name: "vue" },
+                { message: "None of these", name: "none" }
+            ]
+        },
+        {
+            type: "toggle",
+            name: "typescript",
+            message: "Does your project use TypeScript?",
+            enabled: "Yes",
+            disabled: "No",
+            initial: 0
+        },
+        {
+            type: "multiselect",
+            name: "env",
+            message: "Where does your code run?",
+            hint: "(Press <space> to select, <a> to toggle all, <i> to invert selection)",
+            initial: 0,
+            choices: [
+                { message: "Browser", name: "browser" },
+                { message: "Node", name: "node" }
+            ]
+        },
+        {
+            type: "select",
+            name: "source",
+            message: "How would you like to define a style for your project?",
+            choices: [
+                { message: "Use a popular style guide", name: "guide" },
+                { message: "Answer questions about your style", name: "prompt" },
+                { message: "Inspect your JavaScript file(s)", name: "auto" }
+            ],
+            skip() {
+                return this.state.answers.purpose !== "style";
+            },
+            result(input) {
+                return this.skipped ? null : input;
+            }
+        },
+        {
+            type: "select",
+            name: "styleguide",
+            message: "Which style guide do you want to follow?",
+            choices: [
+                { message: "Airbnb: https://github.com/airbnb/javascript", name: "airbnb" },
+                { message: "Standard: https://github.com/standard/standard", name: "standard" },
+                { message: "Google: https://github.com/google/eslint-config-google", name: "google" },
+                { message: "XO: https://github.com/xojs/eslint-config-xo", name: "xo" }
+            ],
+            skip() {
+                this.state.answers.packageJsonExists = npmUtils.checkPackageJson();
+                return !(this.state.answers.source === "guide" && this.state.answers.packageJsonExists);
+            },
+            result(input) {
+                return this.skipped ? null : input;
+            }
+        },
+        {
+            type: "input",
+            name: "patterns",
+            message: "Which file(s), path(s), or glob(s) should be examined?",
+            skip() {
+                return this.state.answers.source !== "auto";
+            },
+            validate(input) {
+                if (!this.skipped && input.trim().length === 0 && input.trim() !== ",") {
+                    return "You must tell us what code to examine. Try again.";
+                }
+                return true;
+            }
+        },
+        {
+            type: "select",
+            name: "format",
+            message: "What format do you want your config file to be in?",
+            initial: 0,
+            choices: ["JavaScript", "YAML", "JSON"]
+        },
+        {
+            type: "toggle",
+            name: "installESLint",
+            message() {
+                const { answers } = this.state;
+                const verb = semver.ltr(answers.localESLintVersion, answers.requiredESLintVersionRange)
+                    ? "upgrade"
+                    : "downgrade";
+
+                return `The style guide "${answers.styleguide}" requires eslint@${answers.requiredESLintVersionRange}. You are currently using eslint@${answers.localESLintVersion}.\n  Do you want to ${verb}?`;
+            },
+            enabled: "Yes",
+            disabled: "No",
+            initial: 1,
+            skip() {
+                return !(this.state.answers.source === "guide" && this.state.answers.packageJsonExists && hasESLintVersionConflict(this.state.answers));
+            },
+            result(input) {
+                return this.skipped ? null : input;
+            }
+        }
+    ]).then(earlyAnswers => {
+
+        // early exit if no style guide is necessary
+        if (earlyAnswers.purpose !== "style") {
+            const config = processAnswers(earlyAnswers);
+            const modules = getModulesList(config);
+
+            return askInstallModules(modules, earlyAnswers.packageJsonExists)
+                .then(() => writeFile(config, earlyAnswers.format));
+        }
+
+        // early exit if you are using a style guide
+        if (earlyAnswers.source === "guide") {
+            if (!earlyAnswers.packageJsonExists) {
+                log.info("A package.json is necessary to install plugins such as style guides. Run `npm init` to create a package.json file and try again.");
+                return void 0;
+            }
+            if (earlyAnswers.installESLint === false && !semver.satisfies(earlyAnswers.localESLintVersion, earlyAnswers.requiredESLintVersionRange)) {
+                log.info(`Note: it might not work since ESLint's version is mismatched with the ${earlyAnswers.styleguide} config.`);
+            }
+            if (earlyAnswers.styleguide === "airbnb" && earlyAnswers.framework !== "react") {
+                earlyAnswers.styleguide = "airbnb-base";
+            }
+
+            const config = processAnswers(earlyAnswers);
+
+            if (Array.isArray(config.extends)) {
+                config.extends.push(earlyAnswers.styleguide);
+            } else if (config.extends) {
+                config.extends = [config.extends, earlyAnswers.styleguide];
+            } else {
+                config.extends = [earlyAnswers.styleguide];
+            }
+
+            const modules = getModulesList(config);
+
+            return askInstallModules(modules, earlyAnswers.packageJsonExists)
+                .then(() => writeFile(config, earlyAnswers.format));
+
+        }
+
+        if (earlyAnswers.source === "auto") {
+            const combinedAnswers = Object.assign({}, earlyAnswers);
+            const config = processAnswers(combinedAnswers);
+            const modules = getModulesList(config);
+
+            return askInstallModules(modules).then(() => writeFile(config, earlyAnswers.format));
+        }
+
+        // continue with the style questions otherwise...
+        return enquirer.prompt([
+            {
+                type: "select",
+                name: "indent",
+                message: "What style of indentation do you use?",
+                initial: 0,
+                choices: [{ message: "Tabs", name: "tab" }, { message: "Spaces", name: 4 }]
+            },
+            {
+                type: "select",
+                name: "quotes",
+                message: "What quotes do you use for strings?",
+                initial: 0,
+                choices: [{ message: "Double", name: "double" }, { message: "Single", name: "single" }]
+            },
+            {
+                type: "select",
+                name: "linebreak",
+                message: "What line endings do you use?",
+                initial: 0,
+                choices: [{ message: "Unix", name: "unix" }, { message: "Windows", name: "windows" }]
+            },
+            {
+                type: "toggle",
+                name: "semi",
+                message: "Do you require semicolons?",
+                enabled: "Yes",
+                disabled: "No",
+                initial: 1
+            }
+        ]).then(answers => {
+            const totalAnswers = Object.assign({}, earlyAnswers, answers);
+
+            const config = processAnswers(totalAnswers);
+            const modules = getModulesList(config);
+
+            return askInstallModules(modules).then(() => writeFile(config, earlyAnswers.format));
+        });
+    });
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+const init = {
+    getModulesList,
+    hasESLintVersionConflict,
+    installModules,
+    processAnswers,
+    writeFile,
+    /* istanbul ignore next */initializeConfig() {
+        return promptUser();
+    }
+};
+
+module.exports = init;

node_modules/eslint/lib/init/config-rule.js

@@ -0,0 +1,317 @@
+/**
+ * @fileoverview Create configurations for a rule
+ * @author Ian VanSchooten
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const builtInRules = require("../rules");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Wrap all of the elements of an array into arrays.
+ * @param   {*[]}     xs Any array.
+ * @returns {Array[]}    An array of arrays.
+ */
+function explodeArray(xs) {
+    return xs.reduce((accumulator, x) => {
+        accumulator.push([x]);
+        return accumulator;
+    }, []);
+}
+
+/**
+ * Mix two arrays such that each element of the second array is concatenated
+ * onto each element of the first array.
+ *
+ * For example:
+ * combineArrays([a, [b, c]], [x, y]); // -> [[a, x], [a, y], [b, c, x], [b, c, y]]
+ * @param   {Array} arr1 The first array to combine.
+ * @param   {Array} arr2 The second array to combine.
+ * @returns {Array}      A mixture of the elements of the first and second arrays.
+ */
+function combineArrays(arr1, arr2) {
+    const res = [];
+
+    if (arr1.length === 0) {
+        return explodeArray(arr2);
+    }
+    if (arr2.length === 0) {
+        return explodeArray(arr1);
+    }
+    arr1.forEach(x1 => {
+        arr2.forEach(x2 => {
+            res.push([].concat(x1, x2));
+        });
+    });
+    return res;
+}
+
+/**
+ * Group together valid rule configurations based on object properties
+ *
+ * e.g.:
+ * groupByProperty([
+ *     {before: true},
+ *     {before: false},
+ *     {after: true},
+ *     {after: false}
+ * ]);
+ *
+ * will return:
+ * [
+ *     [{before: true}, {before: false}],
+ *     [{after: true}, {after: false}]
+ * ]
+ * @param   {Object[]} objects Array of objects, each with one property/value pair
+ * @returns {Array[]}          Array of arrays of objects grouped by property
+ */
+function groupByProperty(objects) {
+    const groupedObj = objects.reduce((accumulator, obj) => {
+        const prop = Object.keys(obj)[0];
+
+        accumulator[prop] = accumulator[prop] ? accumulator[prop].concat(obj) : [obj];
+        return accumulator;
+    }, {});
+
+    return Object.keys(groupedObj).map(prop => groupedObj[prop]);
+}
+
+
+//------------------------------------------------------------------------------
+// Private
+//------------------------------------------------------------------------------
+
+/**
+ * Configuration settings for a rule.
+ *
+ * A configuration can be a single number (severity), or an array where the first
+ * element in the array is the severity, and is the only required element.
+ * Configs may also have one or more additional elements to specify rule
+ * configuration or options.
+ * @typedef {Array|number} ruleConfig
+ * @param {number}  0  The rule's severity (0, 1, 2).
+ */
+
+/**
+ * Object whose keys are rule names and values are arrays of valid ruleConfig items
+ * which should be linted against the target source code to determine error counts.
+ * (a ruleConfigSet.ruleConfigs).
+ *
+ * e.g. rulesConfig = {
+ *     "comma-dangle": [2, [2, "always"], [2, "always-multiline"], [2, "never"]],
+ *     "no-console": [2]
+ * }
+ * @typedef rulesConfig
+ */
+
+
+/**
+ * Create valid rule configurations by combining two arrays,
+ * with each array containing multiple objects each with a
+ * single property/value pair and matching properties.
+ *
+ * e.g.:
+ * combinePropertyObjects(
+ *     [{before: true}, {before: false}],
+ *     [{after: true}, {after: false}]
+ * );
+ *
+ * will return:
+ * [
+ *     {before: true, after: true},
+ *     {before: true, after: false},
+ *     {before: false, after: true},
+ *     {before: false, after: false}
+ * ]
+ * @param   {Object[]} objArr1 Single key/value objects, all with the same key
+ * @param   {Object[]} objArr2 Single key/value objects, all with another key
+ * @returns {Object[]}         Combined objects for each combination of input properties and values
+ */
+function combinePropertyObjects(objArr1, objArr2) {
+    const res = [];
+
+    if (objArr1.length === 0) {
+        return objArr2;
+    }
+    if (objArr2.length === 0) {
+        return objArr1;
+    }
+    objArr1.forEach(obj1 => {
+        objArr2.forEach(obj2 => {
+            const combinedObj = {};
+            const obj1Props = Object.keys(obj1);
+            const obj2Props = Object.keys(obj2);
+
+            obj1Props.forEach(prop1 => {
+                combinedObj[prop1] = obj1[prop1];
+            });
+            obj2Props.forEach(prop2 => {
+                combinedObj[prop2] = obj2[prop2];
+            });
+            res.push(combinedObj);
+        });
+    });
+    return res;
+}
+
+/**
+ * Creates a new instance of a rule configuration set
+ *
+ * A rule configuration set is an array of configurations that are valid for a
+ * given rule.  For example, the configuration set for the "semi" rule could be:
+ *
+ * ruleConfigSet.ruleConfigs // -> [[2], [2, "always"], [2, "never"]]
+ *
+ * Rule configuration set class
+ */
+class RuleConfigSet {
+
+    // eslint-disable-next-line jsdoc/require-description
+    /**
+     * @param {ruleConfig[]} configs Valid rule configurations
+     */
+    constructor(configs) {
+
+        /**
+         * Stored valid rule configurations for this instance
+         * @type {Array}
+         */
+        this.ruleConfigs = configs || [];
+    }
+
+    /**
+     * Add a severity level to the front of all configs in the instance.
+     * This should only be called after all configs have been added to the instance.
+     * @returns {void}
+     */
+    addErrorSeverity() {
+        const severity = 2;
+
+        this.ruleConfigs = this.ruleConfigs.map(config => {
+            config.unshift(severity);
+            return config;
+        });
+
+        // Add a single config at the beginning consisting of only the severity
+        this.ruleConfigs.unshift(severity);
+    }
+
+    /**
+     * Add rule configs from an array of strings (schema enums)
+     * @param  {string[]} enums Array of valid rule options (e.g. ["always", "never"])
+     * @returns {void}
+     */
+    addEnums(enums) {
+        this.ruleConfigs = this.ruleConfigs.concat(combineArrays(this.ruleConfigs, enums));
+    }
+
+    /**
+     * Add rule configurations from a schema object
+     * @param  {Object} obj Schema item with type === "object"
+     * @returns {boolean} true if at least one schema for the object could be generated, false otherwise
+     */
+    addObject(obj) {
+        const objectConfigSet = {
+            objectConfigs: [],
+            add(property, values) {
+                for (let idx = 0; idx < values.length; idx++) {
+                    const optionObj = {};
+
+                    optionObj[property] = values[idx];
+                    this.objectConfigs.push(optionObj);
+                }
+            },
+
+            combine() {
+                this.objectConfigs = groupByProperty(this.objectConfigs).reduce((accumulator, objArr) => combinePropertyObjects(accumulator, objArr), []);
+            }
+        };
+
+        /*
+         * The object schema could have multiple independent properties.
+         * If any contain enums or booleans, they can be added and then combined
+         */
+        Object.keys(obj.properties).forEach(prop => {
+            if (obj.properties[prop].enum) {
+                objectConfigSet.add(prop, obj.properties[prop].enum);
+            }
+            if (obj.properties[prop].type && obj.properties[prop].type === "boolean") {
+                objectConfigSet.add(prop, [true, false]);
+            }
+        });
+        objectConfigSet.combine();
+
+        if (objectConfigSet.objectConfigs.length > 0) {
+            this.ruleConfigs = this.ruleConfigs.concat(combineArrays(this.ruleConfigs, objectConfigSet.objectConfigs));
+            return true;
+        }
+
+        return false;
+    }
+}
+
+/**
+ * Generate valid rule configurations based on a schema object
+ * @param   {Object} schema  A rule's schema object
+ * @returns {Array[]}        Valid rule configurations
+ */
+function generateConfigsFromSchema(schema) {
+    const configSet = new RuleConfigSet();
+
+    if (Array.isArray(schema)) {
+        for (const opt of schema) {
+            if (opt.enum) {
+                configSet.addEnums(opt.enum);
+            } else if (opt.type && opt.type === "object") {
+                if (!configSet.addObject(opt)) {
+                    break;
+                }
+
+            // TODO (IanVS): support oneOf
+            } else {
+
+                // If we don't know how to fill in this option, don't fill in any of the following options.
+                break;
+            }
+        }
+    }
+    configSet.addErrorSeverity();
+    return configSet.ruleConfigs;
+}
+
+/**
+ * Generate possible rule configurations for all of the core rules
+ * @param {boolean} noDeprecated Indicates whether ignores deprecated rules or not.
+ * @returns {rulesConfig} Hash of rule names and arrays of possible configurations
+ */
+function createCoreRuleConfigs(noDeprecated = false) {
+    return Array.from(builtInRules).reduce((accumulator, [id, rule]) => {
+        const schema = (typeof rule === "function") ? rule.schema : rule.meta.schema;
+        const isDeprecated = (typeof rule === "function") ? rule.deprecated : rule.meta.deprecated;
+
+        if (noDeprecated && isDeprecated) {
+            return accumulator;
+        }
+
+        accumulator[id] = generateConfigsFromSchema(schema);
+        return accumulator;
+    }, {});
+}
+
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = {
+    generateConfigsFromSchema,
+    createCoreRuleConfigs
+};

node_modules/eslint/lib/init/npm-utils.js

@@ -0,0 +1,178 @@
+/**
+ * @fileoverview Utility for executing npm commands.
+ * @author Ian VanSchooten
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const fs = require("fs"),
+    spawn = require("cross-spawn"),
+    path = require("path"),
+    log = require("../shared/logging");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Find the closest package.json file, starting at process.cwd (by default),
+ * and working up to root.
+ * @param   {string} [startDir=process.cwd()] Starting directory
+ * @returns {string}                          Absolute path to closest package.json file
+ */
+function findPackageJson(startDir) {
+    let dir = path.resolve(startDir || process.cwd());
+
+    do {
+        const pkgFile = path.join(dir, "package.json");
+
+        if (!fs.existsSync(pkgFile) || !fs.statSync(pkgFile).isFile()) {
+            dir = path.join(dir, "..");
+            continue;
+        }
+        return pkgFile;
+    } while (dir !== path.resolve(dir, ".."));
+    return null;
+}
+
+//------------------------------------------------------------------------------
+// Private
+//------------------------------------------------------------------------------
+
+/**
+ * Install node modules synchronously and save to devDependencies in package.json
+ * @param   {string|string[]} packages Node module or modules to install
+ * @returns {void}
+ */
+function installSyncSaveDev(packages) {
+    const packageList = Array.isArray(packages) ? packages : [packages];
+    const npmProcess = spawn.sync("npm", ["i", "--save-dev"].concat(packageList), { stdio: "inherit" });
+    const error = npmProcess.error;
+
+    if (error && error.code === "ENOENT") {
+        const pluralS = packageList.length > 1 ? "s" : "";
+
+        log.error(`Could not execute npm. Please install the following package${pluralS} with a package manager of your choice: ${packageList.join(", ")}`);
+    }
+}
+
+/**
+ * Fetch `peerDependencies` of the given package by `npm show` command.
+ * @param {string} packageName The package name to fetch peerDependencies.
+ * @returns {Object} Gotten peerDependencies. Returns null if npm was not found.
+ */
+function fetchPeerDependencies(packageName) {
+    const npmProcess = spawn.sync(
+        "npm",
+        ["show", "--json", packageName, "peerDependencies"],
+        { encoding: "utf8" }
+    );
+
+    const error = npmProcess.error;
+
+    if (error && error.code === "ENOENT") {
+        return null;
+    }
+    const fetchedText = npmProcess.stdout.trim();
+
+    return JSON.parse(fetchedText || "{}");
+
+
+}
+
+/**
+ * Check whether node modules are include in a project's package.json.
+ * @param   {string[]} packages           Array of node module names
+ * @param   {Object}  opt                 Options Object
+ * @param   {boolean} opt.dependencies    Set to true to check for direct dependencies
+ * @param   {boolean} opt.devDependencies Set to true to check for development dependencies
+ * @param   {boolean} opt.startdir        Directory to begin searching from
+ * @returns {Object}                      An object whose keys are the module names
+ *                                        and values are booleans indicating installation.
+ */
+function check(packages, opt) {
+    const deps = new Set();
+    const pkgJson = (opt) ? findPackageJson(opt.startDir) : findPackageJson();
+    let fileJson;
+
+    if (!pkgJson) {
+        throw new Error("Could not find a package.json file. Run 'npm init' to create one.");
+    }
+
+    try {
+        fileJson = JSON.parse(fs.readFileSync(pkgJson, "utf8"));
+    } catch (e) {
+        const error = new Error(e);
+
+        error.messageTemplate = "failed-to-read-json";
+        error.messageData = {
+            path: pkgJson,
+            message: e.message
+        };
+        throw error;
+    }
+
+    ["dependencies", "devDependencies"].forEach(key => {
+        if (opt[key] && typeof fileJson[key] === "object") {
+            Object.keys(fileJson[key]).forEach(dep => deps.add(dep));
+        }
+    });
+
+    return packages.reduce((status, pkg) => {
+        status[pkg] = deps.has(pkg);
+        return status;
+    }, {});
+}
+
+/**
+ * Check whether node modules are included in the dependencies of a project's
+ * package.json.
+ *
+ * Convenience wrapper around check().
+ * @param   {string[]} packages  Array of node modules to check.
+ * @param   {string}   rootDir   The directory containing a package.json
+ * @returns {Object}             An object whose keys are the module names
+ *                               and values are booleans indicating installation.
+ */
+function checkDeps(packages, rootDir) {
+    return check(packages, { dependencies: true, startDir: rootDir });
+}
+
+/**
+ * Check whether node modules are included in the devDependencies of a project's
+ * package.json.
+ *
+ * Convenience wrapper around check().
+ * @param   {string[]} packages  Array of node modules to check.
+ * @returns {Object}             An object whose keys are the module names
+ *                               and values are booleans indicating installation.
+ */
+function checkDevDeps(packages) {
+    return check(packages, { devDependencies: true });
+}
+
+/**
+ * Check whether package.json is found in current path.
+ * @param   {string} [startDir] Starting directory
+ * @returns {boolean} Whether a package.json is found in current path.
+ */
+function checkPackageJson(startDir) {
+    return !!findPackageJson(startDir);
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = {
+    installSyncSaveDev,
+    fetchPeerDependencies,
+    findPackageJson,
+    checkDeps,
+    checkDevDeps,
+    checkPackageJson
+};

node_modules/eslint/lib/init/source-code-utils.js

@@ -0,0 +1,109 @@
+/**
+ * @fileoverview Tools for obtaining SourceCode objects.
+ * @author Ian VanSchooten
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const { CLIEngine } = require("../cli-engine");
+
+/*
+ * This is used for:
+ *
+ * 1. Enumerate target file because we have not expose such a API on `CLIEngine`
+ *    (https://github.com/eslint/eslint/issues/11222).
+ * 2. Create `SourceCode` instances. Because we don't have any function which
+ *    instantiate `SourceCode` so it needs to take the created `SourceCode`
+ *    instance out after linting.
+ *
+ * TODO1: Expose the API that enumerates target files.
+ * TODO2: Extract the creation logic of `SourceCode` from `Linter` class.
+ */
+const { getCLIEngineInternalSlots } = require("../cli-engine/cli-engine"); // eslint-disable-line node/no-restricted-require
+
+const debug = require("debug")("eslint:source-code-utils");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Get the SourceCode object for a single file
+ * @param   {string}     filename The fully resolved filename to get SourceCode from.
+ * @param   {Object}     engine  A CLIEngine.
+ * @returns {Array}               Array of the SourceCode object representing the file
+ *                                and fatal error message.
+ */
+function getSourceCodeOfFile(filename, engine) {
+    debug("getting sourceCode of", filename);
+    const results = engine.executeOnFiles([filename]);
+
+    if (results && results.results[0] && results.results[0].messages[0] && results.results[0].messages[0].fatal) {
+        const msg = results.results[0].messages[0];
+
+        throw new Error(`(${filename}:${msg.line}:${msg.column}) ${msg.message}`);
+    }
+
+    // TODO: extract the logic that creates source code objects to `SourceCode#parse(text, options)` or something like.
+    const { linter } = getCLIEngineInternalSlots(engine);
+    const sourceCode = linter.getSourceCode();
+
+    return sourceCode;
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+
+/**
+ * This callback is used to measure execution status in a progress bar
+ * @callback progressCallback
+ * @param {number} The total number of times the callback will be called.
+ */
+
+/**
+ * Gets the SourceCode of a single file, or set of files.
+ * @param {string[]|string} patterns A filename, directory name, or glob, or an array of them
+ * @param {Object} options A CLIEngine options object. If not provided, the default cli options will be used.
+ * @param {progressCallback} callback Callback for reporting execution status
+ * @returns {Object} The SourceCode of all processed files.
+ */
+function getSourceCodeOfFiles(patterns, options, callback) {
+    const sourceCodes = {};
+    const globPatternsList = typeof patterns === "string" ? [patterns] : patterns;
+    const engine = new CLIEngine({ ...options, rules: {} });
+
+    // TODO: make file iteration as a public API and use it.
+    const { fileEnumerator } = getCLIEngineInternalSlots(engine);
+    const filenames =
+        Array.from(fileEnumerator.iterateFiles(globPatternsList))
+            .filter(entry => !entry.ignored)
+            .map(entry => entry.filePath);
+
+    if (filenames.length === 0) {
+        debug(`Did not find any files matching pattern(s): ${globPatternsList}`);
+    }
+
+    filenames.forEach(filename => {
+        const sourceCode = getSourceCodeOfFile(filename, engine);
+
+        if (sourceCode) {
+            debug("got sourceCode of", filename);
+            sourceCodes[filename] = sourceCode;
+        }
+        if (callback) {
+            callback(filenames.length); // eslint-disable-line node/callback-return
+        }
+    });
+
+    return sourceCodes;
+}
+
+module.exports = {
+    getSourceCodeOfFiles
+};

node_modules/eslint/lib/linter/apply-disable-directives.js

@@ -0,0 +1,179 @@
+/**
+ * @fileoverview A module that filters reported problems based on `eslint-disable` and `eslint-enable` comments
+ * @author Teddy Katz
+ */
+
+"use strict";
+
+/**
+ * Compares the locations of two objects in a source file
+ * @param {{line: number, column: number}} itemA The first object
+ * @param {{line: number, column: number}} itemB The second object
+ * @returns {number} A value less than 1 if itemA appears before itemB in the source file, greater than 1 if
+ * itemA appears after itemB in the source file, or 0 if itemA and itemB have the same location.
+ */
+function compareLocations(itemA, itemB) {
+    return itemA.line - itemB.line || itemA.column - itemB.column;
+}
+
+/**
+ * This is the same as the exported function, except that it
+ * doesn't handle disable-line and disable-next-line directives, and it always reports unused
+ * disable directives.
+ * @param {Object} options options for applying directives. This is the same as the options
+ * for the exported function, except that `reportUnusedDisableDirectives` is not supported
+ * (this function always reports unused disable directives).
+ * @returns {{problems: Problem[], unusedDisableDirectives: Problem[]}} An object with a list
+ * of filtered problems and unused eslint-disable directives
+ */
+function applyDirectives(options) {
+    const problems = [];
+    let nextDirectiveIndex = 0;
+    let currentGlobalDisableDirective = null;
+    const disabledRuleMap = new Map();
+
+    // enabledRules is only used when there is a current global disable directive.
+    const enabledRules = new Set();
+    const usedDisableDirectives = new Set();
+
+    for (const problem of options.problems) {
+        while (
+            nextDirectiveIndex < options.directives.length &&
+            compareLocations(options.directives[nextDirectiveIndex], problem) <= 0
+        ) {
+            const directive = options.directives[nextDirectiveIndex++];
+
+            switch (directive.type) {
+                case "disable":
+                    if (directive.ruleId === null) {
+                        currentGlobalDisableDirective = directive;
+                        disabledRuleMap.clear();
+                        enabledRules.clear();
+                    } else if (currentGlobalDisableDirective) {
+                        enabledRules.delete(directive.ruleId);
+                        disabledRuleMap.set(directive.ruleId, directive);
+                    } else {
+                        disabledRuleMap.set(directive.ruleId, directive);
+                    }
+                    break;
+
+                case "enable":
+                    if (directive.ruleId === null) {
+                        currentGlobalDisableDirective = null;
+                        disabledRuleMap.clear();
+                    } else if (currentGlobalDisableDirective) {
+                        enabledRules.add(directive.ruleId);
+                        disabledRuleMap.delete(directive.ruleId);
+                    } else {
+                        disabledRuleMap.delete(directive.ruleId);
+                    }
+                    break;
+
+                // no default
+            }
+        }
+
+        if (disabledRuleMap.has(problem.ruleId)) {
+            usedDisableDirectives.add(disabledRuleMap.get(problem.ruleId));
+        } else if (currentGlobalDisableDirective && !enabledRules.has(problem.ruleId)) {
+            usedDisableDirectives.add(currentGlobalDisableDirective);
+        } else {
+            problems.push(problem);
+        }
+    }
+
+    const unusedDisableDirectives = options.directives
+        .filter(directive => directive.type === "disable" && !usedDisableDirectives.has(directive))
+        .map(directive => ({
+            ruleId: null,
+            message: directive.ruleId
+                ? `Unused eslint-disable directive (no problems were reported from '${directive.ruleId}').`
+                : "Unused eslint-disable directive (no problems were reported).",
+            line: directive.unprocessedDirective.line,
+            column: directive.unprocessedDirective.column,
+            severity: options.reportUnusedDisableDirectives === "warn" ? 1 : 2,
+            nodeType: null
+        }));
+
+    return { problems, unusedDisableDirectives };
+}
+
+/**
+ * Given a list of directive comments (i.e. metadata about eslint-disable and eslint-enable comments) and a list
+ * of reported problems, determines which problems should be reported.
+ * @param {Object} options Information about directives and problems
+ * @param {{
+ *      type: ("disable"|"enable"|"disable-line"|"disable-next-line"),
+ *      ruleId: (string|null),
+ *      line: number,
+ *      column: number
+ * }} options.directives Directive comments found in the file, with one-based columns.
+ * Two directive comments can only have the same location if they also have the same type (e.g. a single eslint-disable
+ * comment for two different rules is represented as two directives).
+ * @param {{ruleId: (string|null), line: number, column: number}[]} options.problems
+ * A list of problems reported by rules, sorted by increasing location in the file, with one-based columns.
+ * @param {"off" | "warn" | "error"} options.reportUnusedDisableDirectives If `"warn"` or `"error"`, adds additional problems for unused directives
+ * @returns {{ruleId: (string|null), line: number, column: number}[]}
+ * A list of reported problems that were not disabled by the directive comments.
+ */
+module.exports = ({ directives, problems, reportUnusedDisableDirectives = "off" }) => {
+    const blockDirectives = directives
+        .filter(directive => directive.type === "disable" || directive.type === "enable")
+        .map(directive => Object.assign({}, directive, { unprocessedDirective: directive }))
+        .sort(compareLocations);
+
+    /**
+     * Returns a new array formed by applying a given callback function to each element of the array, and then flattening the result by one level.
+     * TODO(stephenwade): Replace this with array.flatMap when we drop support for Node v10
+     * @param {any[]} array The array to process
+     * @param {Function} fn The function to use
+     * @returns {any[]} The result array
+     */
+    function flatMap(array, fn) {
+        const mapped = array.map(fn);
+        const flattened = [].concat(...mapped);
+
+        return flattened;
+    }
+
+    const lineDirectives = flatMap(directives, directive => {
+        switch (directive.type) {
+            case "disable":
+            case "enable":
+                return [];
+
+            case "disable-line":
+                return [
+                    { type: "disable", line: directive.line, column: 1, ruleId: directive.ruleId, unprocessedDirective: directive },
+                    { type: "enable", line: directive.line + 1, column: 0, ruleId: directive.ruleId, unprocessedDirective: directive }
+                ];
+
+            case "disable-next-line":
+                return [
+                    { type: "disable", line: directive.line + 1, column: 1, ruleId: directive.ruleId, unprocessedDirective: directive },
+                    { type: "enable", line: directive.line + 2, column: 0, ruleId: directive.ruleId, unprocessedDirective: directive }
+                ];
+
+            default:
+                throw new TypeError(`Unrecognized directive type '${directive.type}'`);
+        }
+    }).sort(compareLocations);
+
+    const blockDirectivesResult = applyDirectives({
+        problems,
+        directives: blockDirectives,
+        reportUnusedDisableDirectives
+    });
+    const lineDirectivesResult = applyDirectives({
+        problems: blockDirectivesResult.problems,
+        directives: lineDirectives,
+        reportUnusedDisableDirectives
+    });
+
+    return reportUnusedDisableDirectives !== "off"
+        ? lineDirectivesResult.problems
+            .concat(blockDirectivesResult.unusedDisableDirectives)
+            .concat(lineDirectivesResult.unusedDisableDirectives)
+            .sort(compareLocations)
+        : lineDirectivesResult.problems;
+};

node_modules/eslint/lib/linter/code-path-analysis/code-path-analyzer.js

@@ -0,0 +1,760 @@
+/**
+ * @fileoverview A class of the code path analyzer.
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const assert = require("assert"),
+    { breakableTypePattern } = require("../../shared/ast-utils"),
+    CodePath = require("./code-path"),
+    CodePathSegment = require("./code-path-segment"),
+    IdGenerator = require("./id-generator"),
+    debug = require("./debug-helpers");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Checks whether or not a given node is a `case` node (not `default` node).
+ * @param {ASTNode} node A `SwitchCase` node to check.
+ * @returns {boolean} `true` if the node is a `case` node (not `default` node).
+ */
+function isCaseNode(node) {
+    return Boolean(node.test);
+}
+
+/**
+ * Checks whether the given logical operator is taken into account for the code
+ * path analysis.
+ * @param {string} operator The operator found in the LogicalExpression node
+ * @returns {boolean} `true` if the operator is "&&" or "||" or "??"
+ */
+function isHandledLogicalOperator(operator) {
+    return operator === "&&" || operator === "||" || operator === "??";
+}
+
+/**
+ * Checks whether the given assignment operator is a logical assignment operator.
+ * Logical assignments are taken into account for the code path analysis
+ * because of their short-circuiting semantics.
+ * @param {string} operator The operator found in the AssignmentExpression node
+ * @returns {boolean} `true` if the operator is "&&=" or "||=" or "??="
+ */
+function isLogicalAssignmentOperator(operator) {
+    return operator === "&&=" || operator === "||=" || operator === "??=";
+}
+
+/**
+ * Gets the label if the parent node of a given node is a LabeledStatement.
+ * @param {ASTNode} node A node to get.
+ * @returns {string|null} The label or `null`.
+ */
+function getLabel(node) {
+    if (node.parent.type === "LabeledStatement") {
+        return node.parent.label.name;
+    }
+    return null;
+}
+
+/**
+ * Checks whether or not a given logical expression node goes different path
+ * between the `true` case and the `false` case.
+ * @param {ASTNode} node A node to check.
+ * @returns {boolean} `true` if the node is a test of a choice statement.
+ */
+function isForkingByTrueOrFalse(node) {
+    const parent = node.parent;
+
+    switch (parent.type) {
+        case "ConditionalExpression":
+        case "IfStatement":
+        case "WhileStatement":
+        case "DoWhileStatement":
+        case "ForStatement":
+            return parent.test === node;
+
+        case "LogicalExpression":
+            return isHandledLogicalOperator(parent.operator);
+
+        case "AssignmentExpression":
+            return isLogicalAssignmentOperator(parent.operator);
+
+        default:
+            return false;
+    }
+}
+
+/**
+ * Gets the boolean value of a given literal node.
+ *
+ * This is used to detect infinity loops (e.g. `while (true) {}`).
+ * Statements preceded by an infinity loop are unreachable if the loop didn't
+ * have any `break` statement.
+ * @param {ASTNode} node A node to get.
+ * @returns {boolean|undefined} a boolean value if the node is a Literal node,
+ *   otherwise `undefined`.
+ */
+function getBooleanValueIfSimpleConstant(node) {
+    if (node.type === "Literal") {
+        return Boolean(node.value);
+    }
+    return void 0;
+}
+
+/**
+ * Checks that a given identifier node is a reference or not.
+ *
+ * This is used to detect the first throwable node in a `try` block.
+ * @param {ASTNode} node An Identifier node to check.
+ * @returns {boolean} `true` if the node is a reference.
+ */
+function isIdentifierReference(node) {
+    const parent = node.parent;
+
+    switch (parent.type) {
+        case "LabeledStatement":
+        case "BreakStatement":
+        case "ContinueStatement":
+        case "ArrayPattern":
+        case "RestElement":
+        case "ImportSpecifier":
+        case "ImportDefaultSpecifier":
+        case "ImportNamespaceSpecifier":
+        case "CatchClause":
+            return false;
+
+        case "FunctionDeclaration":
+        case "FunctionExpression":
+        case "ArrowFunctionExpression":
+        case "ClassDeclaration":
+        case "ClassExpression":
+        case "VariableDeclarator":
+            return parent.id !== node;
+
+        case "Property":
+        case "MethodDefinition":
+            return (
+                parent.key !== node ||
+                parent.computed ||
+                parent.shorthand
+            );
+
+        case "AssignmentPattern":
+            return parent.key !== node;
+
+        default:
+            return true;
+    }
+}
+
+/**
+ * Updates the current segment with the head segment.
+ * This is similar to local branches and tracking branches of git.
+ *
+ * To separate the current and the head is in order to not make useless segments.
+ *
+ * In this process, both "onCodePathSegmentStart" and "onCodePathSegmentEnd"
+ * events are fired.
+ * @param {CodePathAnalyzer} analyzer The instance.
+ * @param {ASTNode} node The current AST node.
+ * @returns {void}
+ */
+function forwardCurrentToHead(analyzer, node) {
+    const codePath = analyzer.codePath;
+    const state = CodePath.getState(codePath);
+    const currentSegments = state.currentSegments;
+    const headSegments = state.headSegments;
+    const end = Math.max(currentSegments.length, headSegments.length);
+    let i, currentSegment, headSegment;
+
+    // Fires leaving events.
+    for (i = 0; i < end; ++i) {
+        currentSegment = currentSegments[i];
+        headSegment = headSegments[i];
+
+        if (currentSegment !== headSegment && currentSegment) {
+            debug.dump(`onCodePathSegmentEnd ${currentSegment.id}`);
+
+            if (currentSegment.reachable) {
+                analyzer.emitter.emit(
+                    "onCodePathSegmentEnd",
+                    currentSegment,
+                    node
+                );
+            }
+        }
+    }
+
+    // Update state.
+    state.currentSegments = headSegments;
+
+    // Fires entering events.
+    for (i = 0; i < end; ++i) {
+        currentSegment = currentSegments[i];
+        headSegment = headSegments[i];
+
+        if (currentSegment !== headSegment && headSegment) {
+            debug.dump(`onCodePathSegmentStart ${headSegment.id}`);
+
+            CodePathSegment.markUsed(headSegment);
+            if (headSegment.reachable) {
+                analyzer.emitter.emit(
+                    "onCodePathSegmentStart",
+                    headSegment,
+                    node
+                );
+            }
+        }
+    }
+
+}
+
+/**
+ * Updates the current segment with empty.
+ * This is called at the last of functions or the program.
+ * @param {CodePathAnalyzer} analyzer The instance.
+ * @param {ASTNode} node The current AST node.
+ * @returns {void}
+ */
+function leaveFromCurrentSegment(analyzer, node) {
+    const state = CodePath.getState(analyzer.codePath);
+    const currentSegments = state.currentSegments;
+
+    for (let i = 0; i < currentSegments.length; ++i) {
+        const currentSegment = currentSegments[i];
+
+        debug.dump(`onCodePathSegmentEnd ${currentSegment.id}`);
+        if (currentSegment.reachable) {
+            analyzer.emitter.emit(
+                "onCodePathSegmentEnd",
+                currentSegment,
+                node
+            );
+        }
+    }
+
+    state.currentSegments = [];
+}
+
+/**
+ * Updates the code path due to the position of a given node in the parent node
+ * thereof.
+ *
+ * For example, if the node is `parent.consequent`, this creates a fork from the
+ * current path.
+ * @param {CodePathAnalyzer} analyzer The instance.
+ * @param {ASTNode} node The current AST node.
+ * @returns {void}
+ */
+function preprocess(analyzer, node) {
+    const codePath = analyzer.codePath;
+    const state = CodePath.getState(codePath);
+    const parent = node.parent;
+
+    switch (parent.type) {
+
+        // The `arguments.length == 0` case is in `postprocess` function.
+        case "CallExpression":
+            if (parent.optional === true && parent.arguments.length >= 1 && parent.arguments[0] === node) {
+                state.makeOptionalRight();
+            }
+            break;
+        case "MemberExpression":
+            if (parent.optional === true && parent.property === node) {
+                state.makeOptionalRight();
+            }
+            break;
+
+        case "LogicalExpression":
+            if (
+                parent.right === node &&
+                isHandledLogicalOperator(parent.operator)
+            ) {
+                state.makeLogicalRight();
+            }
+            break;
+
+        case "AssignmentExpression":
+            if (
+                parent.right === node &&
+                isLogicalAssignmentOperator(parent.operator)
+            ) {
+                state.makeLogicalRight();
+            }
+            break;
+
+        case "ConditionalExpression":
+        case "IfStatement":
+
+            /*
+             * Fork if this node is at `consequent`/`alternate`.
+             * `popForkContext()` exists at `IfStatement:exit` and
+             * `ConditionalExpression:exit`.
+             */
+            if (parent.consequent === node) {
+                state.makeIfConsequent();
+            } else if (parent.alternate === node) {
+                state.makeIfAlternate();
+            }
+            break;
+
+        case "SwitchCase":
+            if (parent.consequent[0] === node) {
+                state.makeSwitchCaseBody(false, !parent.test);
+            }
+            break;
+
+        case "TryStatement":
+            if (parent.handler === node) {
+                state.makeCatchBlock();
+            } else if (parent.finalizer === node) {
+                state.makeFinallyBlock();
+            }
+            break;
+
+        case "WhileStatement":
+            if (parent.test === node) {
+                state.makeWhileTest(getBooleanValueIfSimpleConstant(node));
+            } else {
+                assert(parent.body === node);
+                state.makeWhileBody();
+            }
+            break;
+
+        case "DoWhileStatement":
+            if (parent.body === node) {
+                state.makeDoWhileBody();
+            } else {
+                assert(parent.test === node);
+                state.makeDoWhileTest(getBooleanValueIfSimpleConstant(node));
+            }
+            break;
+
+        case "ForStatement":
+            if (parent.test === node) {
+                state.makeForTest(getBooleanValueIfSimpleConstant(node));
+            } else if (parent.update === node) {
+                state.makeForUpdate();
+            } else if (parent.body === node) {
+                state.makeForBody();
+            }
+            break;
+
+        case "ForInStatement":
+        case "ForOfStatement":
+            if (parent.left === node) {
+                state.makeForInOfLeft();
+            } else if (parent.right === node) {
+                state.makeForInOfRight();
+            } else {
+                assert(parent.body === node);
+                state.makeForInOfBody();
+            }
+            break;
+
+        case "AssignmentPattern":
+
+            /*
+             * Fork if this node is at `right`.
+             * `left` is executed always, so it uses the current path.
+             * `popForkContext()` exists at `AssignmentPattern:exit`.
+             */
+            if (parent.right === node) {
+                state.pushForkContext();
+                state.forkBypassPath();
+                state.forkPath();
+            }
+            break;
+
+        default:
+            break;
+    }
+}
+
+/**
+ * Updates the code path due to the type of a given node in entering.
+ * @param {CodePathAnalyzer} analyzer The instance.
+ * @param {ASTNode} node The current AST node.
+ * @returns {void}
+ */
+function processCodePathToEnter(analyzer, node) {
+    let codePath = analyzer.codePath;
+    let state = codePath && CodePath.getState(codePath);
+    const parent = node.parent;
+
+    switch (node.type) {
+        case "Program":
+        case "FunctionDeclaration":
+        case "FunctionExpression":
+        case "ArrowFunctionExpression":
+            if (codePath) {
+
+                // Emits onCodePathSegmentStart events if updated.
+                forwardCurrentToHead(analyzer, node);
+                debug.dumpState(node, state, false);
+            }
+
+            // Create the code path of this scope.
+            codePath = analyzer.codePath = new CodePath(
+                analyzer.idGenerator.next(),
+                codePath,
+                analyzer.onLooped
+            );
+            state = CodePath.getState(codePath);
+
+            // Emits onCodePathStart events.
+            debug.dump(`onCodePathStart ${codePath.id}`);
+            analyzer.emitter.emit("onCodePathStart", codePath, node);
+            break;
+
+        case "ChainExpression":
+            state.pushChainContext();
+            break;
+        case "CallExpression":
+            if (node.optional === true) {
+                state.makeOptionalNode();
+            }
+            break;
+        case "MemberExpression":
+            if (node.optional === true) {
+                state.makeOptionalNode();
+            }
+            break;
+
+        case "LogicalExpression":
+            if (isHandledLogicalOperator(node.operator)) {
+                state.pushChoiceContext(
+                    node.operator,
+                    isForkingByTrueOrFalse(node)
+                );
+            }
+            break;
+
+        case "AssignmentExpression":
+            if (isLogicalAssignmentOperator(node.operator)) {
+                state.pushChoiceContext(
+                    node.operator.slice(0, -1), // removes `=` from the end
+                    isForkingByTrueOrFalse(node)
+                );
+            }
+            break;
+
+        case "ConditionalExpression":
+        case "IfStatement":
+            state.pushChoiceContext("test", false);
+            break;
+
+        case "SwitchStatement":
+            state.pushSwitchContext(
+                node.cases.some(isCaseNode),
+                getLabel(node)
+            );
+            break;
+
+        case "TryStatement":
+            state.pushTryContext(Boolean(node.finalizer));
+            break;
+
+        case "SwitchCase":
+
+            /*
+             * Fork if this node is after the 2st node in `cases`.
+             * It's similar to `else` blocks.
+             * The next `test` node is processed in this path.
+             */
+            if (parent.discriminant !== node && parent.cases[0] !== node) {
+                state.forkPath();
+            }
+            break;
+
+        case "WhileStatement":
+        case "DoWhileStatement":
+        case "ForStatement":
+        case "ForInStatement":
+        case "ForOfStatement":
+            state.pushLoopContext(node.type, getLabel(node));
+            break;
+
+        case "LabeledStatement":
+            if (!breakableTypePattern.test(node.body.type)) {
+                state.pushBreakContext(false, node.label.name);
+            }
+            break;
+
+        default:
+            break;
+    }
+
+    // Emits onCodePathSegmentStart events if updated.
+    forwardCurrentToHead(analyzer, node);
+    debug.dumpState(node, state, false);
+}
+
+/**
+ * Updates the code path due to the type of a given node in leaving.
+ * @param {CodePathAnalyzer} analyzer The instance.
+ * @param {ASTNode} node The current AST node.
+ * @returns {void}
+ */
+function processCodePathToExit(analyzer, node) {
+    const codePath = analyzer.codePath;
+    const state = CodePath.getState(codePath);
+    let dontForward = false;
+
+    switch (node.type) {
+        case "ChainExpression":
+            state.popChainContext();
+            break;
+
+        case "IfStatement":
+        case "ConditionalExpression":
+            state.popChoiceContext();
+            break;
+
+        case "LogicalExpression":
+            if (isHandledLogicalOperator(node.operator)) {
+                state.popChoiceContext();
+            }
+            break;
+
+        case "AssignmentExpression":
+            if (isLogicalAssignmentOperator(node.operator)) {
+                state.popChoiceContext();
+            }
+            break;
+
+        case "SwitchStatement":
+            state.popSwitchContext();
+            break;
+
+        case "SwitchCase":
+
+            /*
+             * This is the same as the process at the 1st `consequent` node in
+             * `preprocess` function.
+             * Must do if this `consequent` is empty.
+             */
+            if (node.consequent.length === 0) {
+                state.makeSwitchCaseBody(true, !node.test);
+            }
+            if (state.forkContext.reachable) {
+                dontForward = true;
+            }
+            break;
+
+        case "TryStatement":
+            state.popTryContext();
+            break;
+
+        case "BreakStatement":
+            forwardCurrentToHead(analyzer, node);
+            state.makeBreak(node.label && node.label.name);
+            dontForward = true;
+            break;
+
+        case "ContinueStatement":
+            forwardCurrentToHead(analyzer, node);
+            state.makeContinue(node.label && node.label.name);
+            dontForward = true;
+            break;
+
+        case "ReturnStatement":
+            forwardCurrentToHead(analyzer, node);
+            state.makeReturn();
+            dontForward = true;
+            break;
+
+        case "ThrowStatement":
+            forwardCurrentToHead(analyzer, node);
+            state.makeThrow();
+            dontForward = true;
+            break;
+
+        case "Identifier":
+            if (isIdentifierReference(node)) {
+                state.makeFirstThrowablePathInTryBlock();
+                dontForward = true;
+            }
+            break;
+
+        case "CallExpression":
+        case "ImportExpression":
+        case "MemberExpression":
+        case "NewExpression":
+        case "YieldExpression":
+            state.makeFirstThrowablePathInTryBlock();
+            break;
+
+        case "WhileStatement":
+        case "DoWhileStatement":
+        case "ForStatement":
+        case "ForInStatement":
+        case "ForOfStatement":
+            state.popLoopContext();
+            break;
+
+        case "AssignmentPattern":
+            state.popForkContext();
+            break;
+
+        case "LabeledStatement":
+            if (!breakableTypePattern.test(node.body.type)) {
+                state.popBreakContext();
+            }
+            break;
+
+        default:
+            break;
+    }
+
+    // Emits onCodePathSegmentStart events if updated.
+    if (!dontForward) {
+        forwardCurrentToHead(analyzer, node);
+    }
+    debug.dumpState(node, state, true);
+}
+
+/**
+ * Updates the code path to finalize the current code path.
+ * @param {CodePathAnalyzer} analyzer The instance.
+ * @param {ASTNode} node The current AST node.
+ * @returns {void}
+ */
+function postprocess(analyzer, node) {
+    switch (node.type) {
+        case "Program":
+        case "FunctionDeclaration":
+        case "FunctionExpression":
+        case "ArrowFunctionExpression": {
+            let codePath = analyzer.codePath;
+
+            // Mark the current path as the final node.
+            CodePath.getState(codePath).makeFinal();
+
+            // Emits onCodePathSegmentEnd event of the current segments.
+            leaveFromCurrentSegment(analyzer, node);
+
+            // Emits onCodePathEnd event of this code path.
+            debug.dump(`onCodePathEnd ${codePath.id}`);
+            analyzer.emitter.emit("onCodePathEnd", codePath, node);
+            debug.dumpDot(codePath);
+
+            codePath = analyzer.codePath = analyzer.codePath.upper;
+            if (codePath) {
+                debug.dumpState(node, CodePath.getState(codePath), true);
+            }
+            break;
+        }
+
+        // The `arguments.length >= 1` case is in `preprocess` function.
+        case "CallExpression":
+            if (node.optional === true && node.arguments.length === 0) {
+                CodePath.getState(analyzer.codePath).makeOptionalRight();
+            }
+            break;
+
+        default:
+            break;
+    }
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * The class to analyze code paths.
+ * This class implements the EventGenerator interface.
+ */
+class CodePathAnalyzer {
+
+    // eslint-disable-next-line jsdoc/require-description
+    /**
+     * @param {EventGenerator} eventGenerator An event generator to wrap.
+     */
+    constructor(eventGenerator) {
+        this.original = eventGenerator;
+        this.emitter = eventGenerator.emitter;
+        this.codePath = null;
+        this.idGenerator = new IdGenerator("s");
+        this.currentNode = null;
+        this.onLooped = this.onLooped.bind(this);
+    }
+
+    /**
+     * Does the process to enter a given AST node.
+     * This updates state of analysis and calls `enterNode` of the wrapped.
+     * @param {ASTNode} node A node which is entering.
+     * @returns {void}
+     */
+    enterNode(node) {
+        this.currentNode = node;
+
+        // Updates the code path due to node's position in its parent node.
+        if (node.parent) {
+            preprocess(this, node);
+        }
+
+        /*
+         * Updates the code path.
+         * And emits onCodePathStart/onCodePathSegmentStart events.
+         */
+        processCodePathToEnter(this, node);
+
+        // Emits node events.
+        this.original.enterNode(node);
+
+        this.currentNode = null;
+    }
+
+    /**
+     * Does the process to leave a given AST node.
+     * This updates state of analysis and calls `leaveNode` of the wrapped.
+     * @param {ASTNode} node A node which is leaving.
+     * @returns {void}
+     */
+    leaveNode(node) {
+        this.currentNode = node;
+
+        /*
+         * Updates the code path.
+         * And emits onCodePathStart/onCodePathSegmentStart events.
+         */
+        processCodePathToExit(this, node);
+
+        // Emits node events.
+        this.original.leaveNode(node);
+
+        // Emits the last onCodePathStart/onCodePathSegmentStart events.
+        postprocess(this, node);
+
+        this.currentNode = null;
+    }
+
+    /**
+     * This is called on a code path looped.
+     * Then this raises a looped event.
+     * @param {CodePathSegment} fromSegment A segment of prev.
+     * @param {CodePathSegment} toSegment A segment of next.
+     * @returns {void}
+     */
+    onLooped(fromSegment, toSegment) {
+        if (fromSegment.reachable && toSegment.reachable) {
+            debug.dump(`onCodePathSegmentLoop ${fromSegment.id} -> ${toSegment.id}`);
+            this.emitter.emit(
+                "onCodePathSegmentLoop",
+                fromSegment,
+                toSegment,
+                this.currentNode
+            );
+        }
+    }
+}
+
+module.exports = CodePathAnalyzer;

node_modules/eslint/lib/linter/code-path-analysis/code-path-segment.js

@@ -0,0 +1,236 @@
+/**
+ * @fileoverview A class of the code path segment.
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const debug = require("./debug-helpers");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Checks whether or not a given segment is reachable.
+ * @param {CodePathSegment} segment A segment to check.
+ * @returns {boolean} `true` if the segment is reachable.
+ */
+function isReachable(segment) {
+    return segment.reachable;
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * A code path segment.
+ */
+class CodePathSegment {
+
+    // eslint-disable-next-line jsdoc/require-description
+    /**
+     * @param {string} id An identifier.
+     * @param {CodePathSegment[]} allPrevSegments An array of the previous segments.
+     *   This array includes unreachable segments.
+     * @param {boolean} reachable A flag which shows this is reachable.
+     */
+    constructor(id, allPrevSegments, reachable) {
+
+        /**
+         * The identifier of this code path.
+         * Rules use it to store additional information of each rule.
+         * @type {string}
+         */
+        this.id = id;
+
+        /**
+         * An array of the next segments.
+         * @type {CodePathSegment[]}
+         */
+        this.nextSegments = [];
+
+        /**
+         * An array of the previous segments.
+         * @type {CodePathSegment[]}
+         */
+        this.prevSegments = allPrevSegments.filter(isReachable);
+
+        /**
+         * An array of the next segments.
+         * This array includes unreachable segments.
+         * @type {CodePathSegment[]}
+         */
+        this.allNextSegments = [];
+
+        /**
+         * An array of the previous segments.
+         * This array includes unreachable segments.
+         * @type {CodePathSegment[]}
+         */
+        this.allPrevSegments = allPrevSegments;
+
+        /**
+         * A flag which shows this is reachable.
+         * @type {boolean}
+         */
+        this.reachable = reachable;
+
+        // Internal data.
+        Object.defineProperty(this, "internal", {
+            value: {
+                used: false,
+                loopedPrevSegments: []
+            }
+        });
+
+        /* istanbul ignore if */
+        if (debug.enabled) {
+            this.internal.nodes = [];
+        }
+    }
+
+    /**
+     * Checks a given previous segment is coming from the end of a loop.
+     * @param {CodePathSegment} segment A previous segment to check.
+     * @returns {boolean} `true` if the segment is coming from the end of a loop.
+     */
+    isLoopedPrevSegment(segment) {
+        return this.internal.loopedPrevSegments.indexOf(segment) !== -1;
+    }
+
+    /**
+     * Creates the root segment.
+     * @param {string} id An identifier.
+     * @returns {CodePathSegment} The created segment.
+     */
+    static newRoot(id) {
+        return new CodePathSegment(id, [], true);
+    }
+
+    /**
+     * Creates a segment that follows given segments.
+     * @param {string} id An identifier.
+     * @param {CodePathSegment[]} allPrevSegments An array of the previous segments.
+     * @returns {CodePathSegment} The created segment.
+     */
+    static newNext(id, allPrevSegments) {
+        return new CodePathSegment(
+            id,
+            CodePathSegment.flattenUnusedSegments(allPrevSegments),
+            allPrevSegments.some(isReachable)
+        );
+    }
+
+    /**
+     * Creates an unreachable segment that follows given segments.
+     * @param {string} id An identifier.
+     * @param {CodePathSegment[]} allPrevSegments An array of the previous segments.
+     * @returns {CodePathSegment} The created segment.
+     */
+    static newUnreachable(id, allPrevSegments) {
+        const segment = new CodePathSegment(id, CodePathSegment.flattenUnusedSegments(allPrevSegments), false);
+
+        /*
+         * In `if (a) return a; foo();` case, the unreachable segment preceded by
+         * the return statement is not used but must not be remove.
+         */
+        CodePathSegment.markUsed(segment);
+
+        return segment;
+    }
+
+    /**
+     * Creates a segment that follows given segments.
+     * This factory method does not connect with `allPrevSegments`.
+     * But this inherits `reachable` flag.
+     * @param {string} id An identifier.
+     * @param {CodePathSegment[]} allPrevSegments An array of the previous segments.
+     * @returns {CodePathSegment} The created segment.
+     */
+    static newDisconnected(id, allPrevSegments) {
+        return new CodePathSegment(id, [], allPrevSegments.some(isReachable));
+    }
+
+    /**
+     * Makes a given segment being used.
+     *
+     * And this function registers the segment into the previous segments as a next.
+     * @param {CodePathSegment} segment A segment to mark.
+     * @returns {void}
+     */
+    static markUsed(segment) {
+        if (segment.internal.used) {
+            return;
+        }
+        segment.internal.used = true;
+
+        let i;
+
+        if (segment.reachable) {
+            for (i = 0; i < segment.allPrevSegments.length; ++i) {
+                const prevSegment = segment.allPrevSegments[i];
+
+                prevSegment.allNextSegments.push(segment);
+                prevSegment.nextSegments.push(segment);
+            }
+        } else {
+            for (i = 0; i < segment.allPrevSegments.length; ++i) {
+                segment.allPrevSegments[i].allNextSegments.push(segment);
+            }
+        }
+    }
+
+    /**
+     * Marks a previous segment as looped.
+     * @param {CodePathSegment} segment A segment.
+     * @param {CodePathSegment} prevSegment A previous segment to mark.
+     * @returns {void}
+     */
+    static markPrevSegmentAsLooped(segment, prevSegment) {
+        segment.internal.loopedPrevSegments.push(prevSegment);
+    }
+
+    /**
+     * Replaces unused segments with the previous segments of each unused segment.
+     * @param {CodePathSegment[]} segments An array of segments to replace.
+     * @returns {CodePathSegment[]} The replaced array.
+     */
+    static flattenUnusedSegments(segments) {
+        const done = Object.create(null);
+        const retv = [];
+
+        for (let i = 0; i < segments.length; ++i) {
+            const segment = segments[i];
+
+            // Ignores duplicated.
+            if (done[segment.id]) {
+                continue;
+            }
+
+            // Use previous segments if unused.
+            if (!segment.internal.used) {
+                for (let j = 0; j < segment.allPrevSegments.length; ++j) {
+                    const prevSegment = segment.allPrevSegments[j];
+
+                    if (!done[prevSegment.id]) {
+                        done[prevSegment.id] = true;
+                        retv.push(prevSegment);
+                    }
+                }
+            } else {
+                done[segment.id] = true;
+                retv.push(segment);
+            }
+        }
+
+        return retv;
+    }
+}
+
+module.exports = CodePathSegment;

node_modules/eslint/lib/linter/code-path-analysis/code-path.js

@@ -0,0 +1,238 @@
+/**
+ * @fileoverview A class of the code path.
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const CodePathState = require("./code-path-state");
+const IdGenerator = require("./id-generator");
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * A code path.
+ */
+class CodePath {
+
+    // eslint-disable-next-line jsdoc/require-description
+    /**
+     * @param {string} id An identifier.
+     * @param {CodePath|null} upper The code path of the upper function scope.
+     * @param {Function} onLooped A callback function to notify looping.
+     */
+    constructor(id, upper, onLooped) {
+
+        /**
+         * The identifier of this code path.
+         * Rules use it to store additional information of each rule.
+         * @type {string}
+         */
+        this.id = id;
+
+        /**
+         * The code path of the upper function scope.
+         * @type {CodePath|null}
+         */
+        this.upper = upper;
+
+        /**
+         * The code paths of nested function scopes.
+         * @type {CodePath[]}
+         */
+        this.childCodePaths = [];
+
+        // Initializes internal state.
+        Object.defineProperty(
+            this,
+            "internal",
+            { value: new CodePathState(new IdGenerator(`${id}_`), onLooped) }
+        );
+
+        // Adds this into `childCodePaths` of `upper`.
+        if (upper) {
+            upper.childCodePaths.push(this);
+        }
+    }
+
+    /**
+     * Gets the state of a given code path.
+     * @param {CodePath} codePath A code path to get.
+     * @returns {CodePathState} The state of the code path.
+     */
+    static getState(codePath) {
+        return codePath.internal;
+    }
+
+    /**
+     * The initial code path segment.
+     * @type {CodePathSegment}
+     */
+    get initialSegment() {
+        return this.internal.initialSegment;
+    }
+
+    /**
+     * Final code path segments.
+     * This array is a mix of `returnedSegments` and `thrownSegments`.
+     * @type {CodePathSegment[]}
+     */
+    get finalSegments() {
+        return this.internal.finalSegments;
+    }
+
+    /**
+     * Final code path segments which is with `return` statements.
+     * This array contains the last path segment if it's reachable.
+     * Since the reachable last path returns `undefined`.
+     * @type {CodePathSegment[]}
+     */
+    get returnedSegments() {
+        return this.internal.returnedForkContext;
+    }
+
+    /**
+     * Final code path segments which is with `throw` statements.
+     * @type {CodePathSegment[]}
+     */
+    get thrownSegments() {
+        return this.internal.thrownForkContext;
+    }
+
+    /**
+     * Current code path segments.
+     * @type {CodePathSegment[]}
+     */
+    get currentSegments() {
+        return this.internal.currentSegments;
+    }
+
+    /**
+     * Traverses all segments in this code path.
+     *
+     *     codePath.traverseSegments(function(segment, controller) {
+     *         // do something.
+     *     });
+     *
+     * This method enumerates segments in order from the head.
+     *
+     * The `controller` object has two methods.
+     *
+     * - `controller.skip()` - Skip the following segments in this branch.
+     * - `controller.break()` - Skip all following segments.
+     * @param {Object} [options] Omittable.
+     * @param {CodePathSegment} [options.first] The first segment to traverse.
+     * @param {CodePathSegment} [options.last] The last segment to traverse.
+     * @param {Function} callback A callback function.
+     * @returns {void}
+     */
+    traverseSegments(options, callback) {
+        let resolvedOptions;
+        let resolvedCallback;
+
+        if (typeof options === "function") {
+            resolvedCallback = options;
+            resolvedOptions = {};
+        } else {
+            resolvedOptions = options || {};
+            resolvedCallback = callback;
+        }
+
+        const startSegment = resolvedOptions.first || this.internal.initialSegment;
+        const lastSegment = resolvedOptions.last;
+
+        let item = null;
+        let index = 0;
+        let end = 0;
+        let segment = null;
+        const visited = Object.create(null);
+        const stack = [[startSegment, 0]];
+        let skippedSegment = null;
+        let broken = false;
+        const controller = {
+            skip() {
+                if (stack.length <= 1) {
+                    broken = true;
+                } else {
+                    skippedSegment = stack[stack.length - 2][0];
+                }
+            },
+            break() {
+                broken = true;
+            }
+        };
+
+        /**
+         * Checks a given previous segment has been visited.
+         * @param {CodePathSegment} prevSegment A previous segment to check.
+         * @returns {boolean} `true` if the segment has been visited.
+         */
+        function isVisited(prevSegment) {
+            return (
+                visited[prevSegment.id] ||
+                segment.isLoopedPrevSegment(prevSegment)
+            );
+        }
+
+        while (stack.length > 0) {
+            item = stack[stack.length - 1];
+            segment = item[0];
+            index = item[1];
+
+            if (index === 0) {
+
+                // Skip if this segment has been visited already.
+                if (visited[segment.id]) {
+                    stack.pop();
+                    continue;
+                }
+
+                // Skip if all previous segments have not been visited.
+                if (segment !== startSegment &&
+                    segment.prevSegments.length > 0 &&
+                    !segment.prevSegments.every(isVisited)
+                ) {
+                    stack.pop();
+                    continue;
+                }
+
+                // Reset the flag of skipping if all branches have been skipped.
+                if (skippedSegment && segment.prevSegments.indexOf(skippedSegment) !== -1) {
+                    skippedSegment = null;
+                }
+                visited[segment.id] = true;
+
+                // Call the callback when the first time.
+                if (!skippedSegment) {
+                    resolvedCallback.call(this, segment, controller);
+                    if (segment === lastSegment) {
+                        controller.skip();
+                    }
+                    if (broken) {
+                        break;
+                    }
+                }
+            }
+
+            // Update the stack.
+            end = segment.nextSegments.length - 1;
+            if (index < end) {
+                item[1] += 1;
+                stack.push([segment.nextSegments[index], 0]);
+            } else if (index === end) {
+                item[0] = segment.nextSegments[index];
+                item[1] = 0;
+            } else {
+                stack.pop();
+            }
+        }
+    }
+}
+
+module.exports = CodePath;

node_modules/eslint/lib/linter/code-path-analysis/debug-helpers.js

@@ -0,0 +1,203 @@
+/**
+ * @fileoverview Helpers to debug for code path analysis.
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const debug = require("debug")("eslint:code-path");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Gets id of a given segment.
+ * @param {CodePathSegment} segment A segment to get.
+ * @returns {string} Id of the segment.
+ */
+/* istanbul ignore next */
+function getId(segment) { // eslint-disable-line jsdoc/require-jsdoc
+    return segment.id + (segment.reachable ? "" : "!");
+}
+
+/**
+ * Get string for the given node and operation.
+ * @param {ASTNode} node The node to convert.
+ * @param {"enter" | "exit" | undefined} label The operation label.
+ * @returns {string} The string representation.
+ */
+function nodeToString(node, label) {
+    const suffix = label ? `:${label}` : "";
+
+    switch (node.type) {
+        case "Identifier": return `${node.type}${suffix} (${node.name})`;
+        case "Literal": return `${node.type}${suffix} (${node.value})`;
+        default: return `${node.type}${suffix}`;
+    }
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = {
+
+    /**
+     * A flag that debug dumping is enabled or not.
+     * @type {boolean}
+     */
+    enabled: debug.enabled,
+
+    /**
+     * Dumps given objects.
+     * @param {...any} args objects to dump.
+     * @returns {void}
+     */
+    dump: debug,
+
+    /**
+     * Dumps the current analyzing state.
+     * @param {ASTNode} node A node to dump.
+     * @param {CodePathState} state A state to dump.
+     * @param {boolean} leaving A flag whether or not it's leaving
+     * @returns {void}
+     */
+    dumpState: !debug.enabled ? debug : /* istanbul ignore next */ function(node, state, leaving) {
+        for (let i = 0; i < state.currentSegments.length; ++i) {
+            const segInternal = state.currentSegments[i].internal;
+
+            if (leaving) {
+                const last = segInternal.nodes.length - 1;
+
+                if (last >= 0 && segInternal.nodes[last] === nodeToString(node, "enter")) {
+                    segInternal.nodes[last] = nodeToString(node, void 0);
+                } else {
+                    segInternal.nodes.push(nodeToString(node, "exit"));
+                }
+            } else {
+                segInternal.nodes.push(nodeToString(node, "enter"));
+            }
+        }
+
+        debug([
+            `${state.currentSegments.map(getId).join(",")})`,
+            `${node.type}${leaving ? ":exit" : ""}`
+        ].join(" "));
+    },
+
+    /**
+     * Dumps a DOT code of a given code path.
+     * The DOT code can be visualized with Graphvis.
+     * @param {CodePath} codePath A code path to dump.
+     * @returns {void}
+     * @see http://www.graphviz.org
+     * @see http://www.webgraphviz.com
+     */
+    dumpDot: !debug.enabled ? debug : /* istanbul ignore next */ function(codePath) {
+        let text =
+            "\n" +
+            "digraph {\n" +
+            "node[shape=box,style=\"rounded,filled\",fillcolor=white];\n" +
+            "initial[label=\"\",shape=circle,style=filled,fillcolor=black,width=0.25,height=0.25];\n";
+
+        if (codePath.returnedSegments.length > 0) {
+            text += "final[label=\"\",shape=doublecircle,style=filled,fillcolor=black,width=0.25,height=0.25];\n";
+        }
+        if (codePath.thrownSegments.length > 0) {
+            text += "thrown[label=\"✘\",shape=circle,width=0.3,height=0.3,fixedsize];\n";
+        }
+
+        const traceMap = Object.create(null);
+        const arrows = this.makeDotArrows(codePath, traceMap);
+
+        for (const id in traceMap) { // eslint-disable-line guard-for-in
+            const segment = traceMap[id];
+
+            text += `${id}[`;
+
+            if (segment.reachable) {
+                text += "label=\"";
+            } else {
+                text += "style=\"rounded,dashed,filled\",fillcolor=\"#FF9800\",label=\"<<unreachable>>\\n";
+            }
+
+            if (segment.internal.nodes.length > 0) {
+                text += segment.internal.nodes.join("\\n");
+            } else {
+                text += "????";
+            }
+
+            text += "\"];\n";
+        }
+
+        text += `${arrows}\n`;
+        text += "}";
+        debug("DOT", text);
+    },
+
+    /**
+     * Makes a DOT code of a given code path.
+     * The DOT code can be visualized with Graphvis.
+     * @param {CodePath} codePath A code path to make DOT.
+     * @param {Object} traceMap Optional. A map to check whether or not segments had been done.
+     * @returns {string} A DOT code of the code path.
+     */
+    makeDotArrows(codePath, traceMap) {
+        const stack = [[codePath.initialSegment, 0]];
+        const done = traceMap || Object.create(null);
+        let lastId = codePath.initialSegment.id;
+        let text = `initial->${codePath.initialSegment.id}`;
+
+        while (stack.length > 0) {
+            const item = stack.pop();
+            const segment = item[0];
+            const index = item[1];
+
+            if (done[segment.id] && index === 0) {
+                continue;
+            }
+            done[segment.id] = segment;
+
+            const nextSegment = segment.allNextSegments[index];
+
+            if (!nextSegment) {
+                continue;
+            }
+
+            if (lastId === segment.id) {
+                text += `->${nextSegment.id}`;
+            } else {
+                text += `;\n${segment.id}->${nextSegment.id}`;
+            }
+            lastId = nextSegment.id;
+
+            stack.unshift([segment, 1 + index]);
+            stack.push([nextSegment, 0]);
+        }
+
+        codePath.returnedSegments.forEach(finalSegment => {
+            if (lastId === finalSegment.id) {
+                text += "->final";
+            } else {
+                text += `;\n${finalSegment.id}->final`;
+            }
+            lastId = null;
+        });
+
+        codePath.thrownSegments.forEach(finalSegment => {
+            if (lastId === finalSegment.id) {
+                text += "->thrown";
+            } else {
+                text += `;\n${finalSegment.id}->thrown`;
+            }
+            lastId = null;
+        });
+
+        return `${text};`;
+    }
+};

node_modules/eslint/lib/linter/code-path-analysis/fork-context.js

@@ -0,0 +1,249 @@
+/**
+ * @fileoverview A class to operate forking.
+ *
+ * This is state of forking.
+ * This has a fork list and manages it.
+ *
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const assert = require("assert"),
+    CodePathSegment = require("./code-path-segment");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Gets whether or not a given segment is reachable.
+ * @param {CodePathSegment} segment A segment to get.
+ * @returns {boolean} `true` if the segment is reachable.
+ */
+function isReachable(segment) {
+    return segment.reachable;
+}
+
+/**
+ * Creates new segments from the specific range of `context.segmentsList`.
+ *
+ * When `context.segmentsList` is `[[a, b], [c, d], [e, f]]`, `begin` is `0`, and
+ * `end` is `-1`, this creates `[g, h]`. This `g` is from `a`, `c`, and `e`.
+ * This `h` is from `b`, `d`, and `f`.
+ * @param {ForkContext} context An instance.
+ * @param {number} begin The first index of the previous segments.
+ * @param {number} end The last index of the previous segments.
+ * @param {Function} create A factory function of new segments.
+ * @returns {CodePathSegment[]} New segments.
+ */
+function makeSegments(context, begin, end, create) {
+    const list = context.segmentsList;
+
+    const normalizedBegin = begin >= 0 ? begin : list.length + begin;
+    const normalizedEnd = end >= 0 ? end : list.length + end;
+
+    const segments = [];
+
+    for (let i = 0; i < context.count; ++i) {
+        const allPrevSegments = [];
+
+        for (let j = normalizedBegin; j <= normalizedEnd; ++j) {
+            allPrevSegments.push(list[j][i]);
+        }
+
+        segments.push(create(context.idGenerator.next(), allPrevSegments));
+    }
+
+    return segments;
+}
+
+/**
+ * `segments` becomes doubly in a `finally` block. Then if a code path exits by a
+ * control statement (such as `break`, `continue`) from the `finally` block, the
+ * destination's segments may be half of the source segments. In that case, this
+ * merges segments.
+ * @param {ForkContext} context An instance.
+ * @param {CodePathSegment[]} segments Segments to merge.
+ * @returns {CodePathSegment[]} The merged segments.
+ */
+function mergeExtraSegments(context, segments) {
+    let currentSegments = segments;
+
+    while (currentSegments.length > context.count) {
+        const merged = [];
+
+        for (let i = 0, length = currentSegments.length / 2 | 0; i < length; ++i) {
+            merged.push(CodePathSegment.newNext(
+                context.idGenerator.next(),
+                [currentSegments[i], currentSegments[i + length]]
+            ));
+        }
+        currentSegments = merged;
+    }
+    return currentSegments;
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * A class to manage forking.
+ */
+class ForkContext {
+
+    // eslint-disable-next-line jsdoc/require-description
+    /**
+     * @param {IdGenerator} idGenerator An identifier generator for segments.
+     * @param {ForkContext|null} upper An upper fork context.
+     * @param {number} count A number of parallel segments.
+     */
+    constructor(idGenerator, upper, count) {
+        this.idGenerator = idGenerator;
+        this.upper = upper;
+        this.count = count;
+        this.segmentsList = [];
+    }
+
+    /**
+     * The head segments.
+     * @type {CodePathSegment[]}
+     */
+    get head() {
+        const list = this.segmentsList;
+
+        return list.length === 0 ? [] : list[list.length - 1];
+    }
+
+    /**
+     * A flag which shows empty.
+     * @type {boolean}
+     */
+    get empty() {
+        return this.segmentsList.length === 0;
+    }
+
+    /**
+     * A flag which shows reachable.
+     * @type {boolean}
+     */
+    get reachable() {
+        const segments = this.head;
+
+        return segments.length > 0 && segments.some(isReachable);
+    }
+
+    /**
+     * Creates new segments from this context.
+     * @param {number} begin The first index of previous segments.
+     * @param {number} end The last index of previous segments.
+     * @returns {CodePathSegment[]} New segments.
+     */
+    makeNext(begin, end) {
+        return makeSegments(this, begin, end, CodePathSegment.newNext);
+    }
+
+    /**
+     * Creates new segments from this context.
+     * The new segments is always unreachable.
+     * @param {number} begin The first index of previous segments.
+     * @param {number} end The last index of previous segments.
+     * @returns {CodePathSegment[]} New segments.
+     */
+    makeUnreachable(begin, end) {
+        return makeSegments(this, begin, end, CodePathSegment.newUnreachable);
+    }
+
+    /**
+     * Creates new segments from this context.
+     * The new segments don't have connections for previous segments.
+     * But these inherit the reachable flag from this context.
+     * @param {number} begin The first index of previous segments.
+     * @param {number} end The last index of previous segments.
+     * @returns {CodePathSegment[]} New segments.
+     */
+    makeDisconnected(begin, end) {
+        return makeSegments(this, begin, end, CodePathSegment.newDisconnected);
+    }
+
+    /**
+     * Adds segments into this context.
+     * The added segments become the head.
+     * @param {CodePathSegment[]} segments Segments to add.
+     * @returns {void}
+     */
+    add(segments) {
+        assert(segments.length >= this.count, `${segments.length} >= ${this.count}`);
+
+        this.segmentsList.push(mergeExtraSegments(this, segments));
+    }
+
+    /**
+     * Replaces the head segments with given segments.
+     * The current head segments are removed.
+     * @param {CodePathSegment[]} segments Segments to add.
+     * @returns {void}
+     */
+    replaceHead(segments) {
+        assert(segments.length >= this.count, `${segments.length} >= ${this.count}`);
+
+        this.segmentsList.splice(-1, 1, mergeExtraSegments(this, segments));
+    }
+
+    /**
+     * Adds all segments of a given fork context into this context.
+     * @param {ForkContext} context A fork context to add.
+     * @returns {void}
+     */
+    addAll(context) {
+        assert(context.count === this.count);
+
+        const source = context.segmentsList;
+
+        for (let i = 0; i < source.length; ++i) {
+            this.segmentsList.push(source[i]);
+        }
+    }
+
+    /**
+     * Clears all segments in this context.
+     * @returns {void}
+     */
+    clear() {
+        this.segmentsList = [];
+    }
+
+    /**
+     * Creates the root fork context.
+     * @param {IdGenerator} idGenerator An identifier generator for segments.
+     * @returns {ForkContext} New fork context.
+     */
+    static newRoot(idGenerator) {
+        const context = new ForkContext(idGenerator, null, 1);
+
+        context.add([CodePathSegment.newRoot(idGenerator.next())]);
+
+        return context;
+    }
+
+    /**
+     * Creates an empty fork context preceded by a given context.
+     * @param {ForkContext} parentContext The parent fork context.
+     * @param {boolean} forkLeavingPath A flag which shows inside of `finally` block.
+     * @returns {ForkContext} New fork context.
+     */
+    static newEmpty(parentContext, forkLeavingPath) {
+        return new ForkContext(
+            parentContext.idGenerator,
+            parentContext,
+            (forkLeavingPath ? 2 : 1) * parentContext.count
+        );
+    }
+}
+
+module.exports = ForkContext;

node_modules/eslint/lib/linter/code-path-analysis/id-generator.js

@@ -0,0 +1,46 @@
+/**
+ * @fileoverview A class of identifiers generator for code path segments.
+ *
+ * Each rule uses the identifier of code path segments to store additional
+ * information of the code path.
+ *
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * A generator for unique ids.
+ */
+class IdGenerator {
+
+    // eslint-disable-next-line jsdoc/require-description
+    /**
+     * @param {string} prefix Optional. A prefix of generated ids.
+     */
+    constructor(prefix) {
+        this.prefix = String(prefix);
+        this.n = 0;
+    }
+
+    /**
+     * Generates id.
+     * @returns {string} A generated id.
+     */
+    next() {
+        this.n = 1 + this.n | 0;
+
+        /* istanbul ignore if */
+        if (this.n < 0) {
+            this.n = 1;
+        }
+
+        return this.prefix + this.n;
+    }
+}
+
+module.exports = IdGenerator;

node_modules/eslint/lib/linter/config-comment-parser.js

@@ -0,0 +1,141 @@
+/**
+ * @fileoverview Config Comment Parser
+ * @author Nicholas C. Zakas
+ */
+
+/* eslint-disable class-methods-use-this*/
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const levn = require("levn"),
+    ConfigOps = require("@eslint/eslintrc/lib/shared/config-ops");
+
+const debug = require("debug")("eslint:config-comment-parser");
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * Object to parse ESLint configuration comments inside JavaScript files.
+ * @name ConfigCommentParser
+ */
+module.exports = class ConfigCommentParser {
+
+    /**
+     * Parses a list of "name:string_value" or/and "name" options divided by comma or
+     * whitespace. Used for "global" and "exported" comments.
+     * @param {string} string The string to parse.
+     * @param {Comment} comment The comment node which has the string.
+     * @returns {Object} Result map object of names and string values, or null values if no value was provided
+     */
+    parseStringConfig(string, comment) {
+        debug("Parsing String config");
+
+        const items = {};
+
+        // Collapse whitespace around `:` and `,` to make parsing easier
+        const trimmedString = string.replace(/\s*([:,])\s*/gu, "$1");
+
+        trimmedString.split(/\s|,+/u).forEach(name => {
+            if (!name) {
+                return;
+            }
+
+            // value defaults to null (if not provided), e.g: "foo" => ["foo", null]
+            const [key, value = null] = name.split(":");
+
+            items[key] = { value, comment };
+        });
+        return items;
+    }
+
+    /**
+     * Parses a JSON-like config.
+     * @param {string} string The string to parse.
+     * @param {Object} location Start line and column of comments for potential error message.
+     * @returns {({success: true, config: Object}|{success: false, error: Problem})} Result map object
+     */
+    parseJsonConfig(string, location) {
+        debug("Parsing JSON config");
+
+        let items = {};
+
+        // Parses a JSON-like comment by the same way as parsing CLI option.
+        try {
+            items = levn.parse("Object", string) || {};
+
+            // Some tests say that it should ignore invalid comments such as `/*eslint no-alert:abc*/`.
+            // Also, commaless notations have invalid severity:
+            //     "no-alert: 2 no-console: 2" --> {"no-alert": "2 no-console: 2"}
+            // Should ignore that case as well.
+            if (ConfigOps.isEverySeverityValid(items)) {
+                return {
+                    success: true,
+                    config: items
+                };
+            }
+        } catch {
+
+            debug("Levn parsing failed; falling back to manual parsing.");
+
+            // ignore to parse the string by a fallback.
+        }
+
+        /*
+         * Optionator cannot parse commaless notations.
+         * But we are supporting that. So this is a fallback for that.
+         */
+        items = {};
+        const normalizedString = string.replace(/([-a-zA-Z0-9/]+):/gu, "\"$1\":").replace(/(\]|[0-9])\s+(?=")/u, "$1,");
+
+        try {
+            items = JSON.parse(`{${normalizedString}}`);
+        } catch (ex) {
+            debug("Manual parsing failed.");
+
+            return {
+                success: false,
+                error: {
+                    ruleId: null,
+                    fatal: true,
+                    severity: 2,
+                    message: `Failed to parse JSON from '${normalizedString}': ${ex.message}`,
+                    line: location.start.line,
+                    column: location.start.column + 1
+                }
+            };
+
+        }
+
+        return {
+            success: true,
+            config: items
+        };
+    }
+
+    /**
+     * Parses a config of values separated by comma.
+     * @param {string} string The string to parse.
+     * @returns {Object} Result map of values and true values
+     */
+    parseListConfig(string) {
+        debug("Parsing list config");
+
+        const items = {};
+
+        // Collapse whitespace around commas
+        string.replace(/\s*,\s*/gu, ",").split(/,+/u).forEach(name => {
+            const trimmedName = name.trim();
+
+            if (trimmedName) {
+                items[trimmedName] = true;
+            }
+        });
+        return items;
+    }
+
+};

node_modules/eslint/lib/linter/index.js

@@ -0,0 +1,13 @@
+"use strict";
+
+const { Linter } = require("./linter");
+const interpolate = require("./interpolate");
+const SourceCodeFixer = require("./source-code-fixer");
+
+module.exports = {
+    Linter,
+
+    // For testers.
+    SourceCodeFixer,
+    interpolate
+};

node_modules/eslint/lib/linter/interpolate.js

@@ -0,0 +1,28 @@
+/**
+ * @fileoverview Interpolate keys from an object into a string with {{ }} markers.
+ * @author Jed Fox
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = (text, data) => {
+    if (!data) {
+        return text;
+    }
+
+    // Substitution content for any {{ }} markers.
+    return text.replace(/\{\{([^{}]+?)\}\}/gu, (fullMatch, termWithWhitespace) => {
+        const term = termWithWhitespace.trim();
+
+        if (term in data) {
+            return data[term];
+        }
+
+        // Preserve old behavior: If parameter name not provided, don't replace it.
+        return fullMatch;
+    });
+};

node_modules/eslint/lib/linter/node-event-generator.js

@@ -0,0 +1,350 @@
+/**
+ * @fileoverview The event generator for AST nodes.
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const esquery = require("esquery");
+
+//------------------------------------------------------------------------------
+// Typedefs
+//------------------------------------------------------------------------------
+
+/**
+ * An object describing an AST selector
+ * @typedef {Object} ASTSelector
+ * @property {string} rawSelector The string that was parsed into this selector
+ * @property {boolean} isExit `true` if this should be emitted when exiting the node rather than when entering
+ * @property {Object} parsedSelector An object (from esquery) describing the matching behavior of the selector
+ * @property {string[]|null} listenerTypes A list of node types that could possibly cause the selector to match,
+ * or `null` if all node types could cause a match
+ * @property {number} attributeCount The total number of classes, pseudo-classes, and attribute queries in this selector
+ * @property {number} identifierCount The total number of identifier queries in this selector
+ */
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Computes the union of one or more arrays
+ * @param {...any[]} arrays One or more arrays to union
+ * @returns {any[]} The union of the input arrays
+ */
+function union(...arrays) {
+
+    // TODO(stephenwade): Replace this with arrays.flat() when we drop support for Node v10
+    return [...new Set([].concat(...arrays))];
+}
+
+/**
+ * Computes the intersection of one or more arrays
+ * @param {...any[]} arrays One or more arrays to intersect
+ * @returns {any[]} The intersection of the input arrays
+ */
+function intersection(...arrays) {
+    if (arrays.length === 0) {
+        return [];
+    }
+
+    let result = [...new Set(arrays[0])];
+
+    for (const array of arrays.slice(1)) {
+        result = result.filter(x => array.includes(x));
+    }
+    return result;
+}
+
+/**
+ * Gets the possible types of a selector
+ * @param {Object} parsedSelector An object (from esquery) describing the matching behavior of the selector
+ * @returns {string[]|null} The node types that could possibly trigger this selector, or `null` if all node types could trigger it
+ */
+function getPossibleTypes(parsedSelector) {
+    switch (parsedSelector.type) {
+        case "identifier":
+            return [parsedSelector.value];
+
+        case "matches": {
+            const typesForComponents = parsedSelector.selectors.map(getPossibleTypes);
+
+            if (typesForComponents.every(Boolean)) {
+                return union(...typesForComponents);
+            }
+            return null;
+        }
+
+        case "compound": {
+            const typesForComponents = parsedSelector.selectors.map(getPossibleTypes).filter(typesForComponent => typesForComponent);
+
+            // If all of the components could match any type, then the compound could also match any type.
+            if (!typesForComponents.length) {
+                return null;
+            }
+
+            /*
+             * If at least one of the components could only match a particular type, the compound could only match
+             * the intersection of those types.
+             */
+            return intersection(...typesForComponents);
+        }
+
+        case "child":
+        case "descendant":
+        case "sibling":
+        case "adjacent":
+            return getPossibleTypes(parsedSelector.right);
+
+        default:
+            return null;
+
+    }
+}
+
+/**
+ * Counts the number of class, pseudo-class, and attribute queries in this selector
+ * @param {Object} parsedSelector An object (from esquery) describing the selector's matching behavior
+ * @returns {number} The number of class, pseudo-class, and attribute queries in this selector
+ */
+function countClassAttributes(parsedSelector) {
+    switch (parsedSelector.type) {
+        case "child":
+        case "descendant":
+        case "sibling":
+        case "adjacent":
+            return countClassAttributes(parsedSelector.left) + countClassAttributes(parsedSelector.right);
+
+        case "compound":
+        case "not":
+        case "matches":
+            return parsedSelector.selectors.reduce((sum, childSelector) => sum + countClassAttributes(childSelector), 0);
+
+        case "attribute":
+        case "field":
+        case "nth-child":
+        case "nth-last-child":
+            return 1;
+
+        default:
+            return 0;
+    }
+}
+
+/**
+ * Counts the number of identifier queries in this selector
+ * @param {Object} parsedSelector An object (from esquery) describing the selector's matching behavior
+ * @returns {number} The number of identifier queries
+ */
+function countIdentifiers(parsedSelector) {
+    switch (parsedSelector.type) {
+        case "child":
+        case "descendant":
+        case "sibling":
+        case "adjacent":
+            return countIdentifiers(parsedSelector.left) + countIdentifiers(parsedSelector.right);
+
+        case "compound":
+        case "not":
+        case "matches":
+            return parsedSelector.selectors.reduce((sum, childSelector) => sum + countIdentifiers(childSelector), 0);
+
+        case "identifier":
+            return 1;
+
+        default:
+            return 0;
+    }
+}
+
+/**
+ * Compares the specificity of two selector objects, with CSS-like rules.
+ * @param {ASTSelector} selectorA An AST selector descriptor
+ * @param {ASTSelector} selectorB Another AST selector descriptor
+ * @returns {number}
+ * a value less than 0 if selectorA is less specific than selectorB
+ * a value greater than 0 if selectorA is more specific than selectorB
+ * a value less than 0 if selectorA and selectorB have the same specificity, and selectorA <= selectorB alphabetically
+ * a value greater than 0 if selectorA and selectorB have the same specificity, and selectorA > selectorB alphabetically
+ */
+function compareSpecificity(selectorA, selectorB) {
+    return selectorA.attributeCount - selectorB.attributeCount ||
+        selectorA.identifierCount - selectorB.identifierCount ||
+        (selectorA.rawSelector <= selectorB.rawSelector ? -1 : 1);
+}
+
+/**
+ * Parses a raw selector string, and throws a useful error if parsing fails.
+ * @param {string} rawSelector A raw AST selector
+ * @returns {Object} An object (from esquery) describing the matching behavior of this selector
+ * @throws {Error} An error if the selector is invalid
+ */
+function tryParseSelector(rawSelector) {
+    try {
+        return esquery.parse(rawSelector.replace(/:exit$/u, ""));
+    } catch (err) {
+        if (err.location && err.location.start && typeof err.location.start.offset === "number") {
+            throw new SyntaxError(`Syntax error in selector "${rawSelector}" at position ${err.location.start.offset}: ${err.message}`);
+        }
+        throw err;
+    }
+}
+
+const selectorCache = new Map();
+
+/**
+ * Parses a raw selector string, and returns the parsed selector along with specificity and type information.
+ * @param {string} rawSelector A raw AST selector
+ * @returns {ASTSelector} A selector descriptor
+ */
+function parseSelector(rawSelector) {
+    if (selectorCache.has(rawSelector)) {
+        return selectorCache.get(rawSelector);
+    }
+
+    const parsedSelector = tryParseSelector(rawSelector);
+
+    const result = {
+        rawSelector,
+        isExit: rawSelector.endsWith(":exit"),
+        parsedSelector,
+        listenerTypes: getPossibleTypes(parsedSelector),
+        attributeCount: countClassAttributes(parsedSelector),
+        identifierCount: countIdentifiers(parsedSelector)
+    };
+
+    selectorCache.set(rawSelector, result);
+    return result;
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * The event generator for AST nodes.
+ * This implements below interface.
+ *
+ * ```ts
+ * interface EventGenerator {
+ *     emitter: SafeEmitter;
+ *     enterNode(node: ASTNode): void;
+ *     leaveNode(node: ASTNode): void;
+ * }
+ * ```
+ */
+class NodeEventGenerator {
+
+    // eslint-disable-next-line jsdoc/require-description
+    /**
+     * @param {SafeEmitter} emitter
+     * An SafeEmitter which is the destination of events. This emitter must already
+     * have registered listeners for all of the events that it needs to listen for.
+     * (See lib/linter/safe-emitter.js for more details on `SafeEmitter`.)
+     * @param {ESQueryOptions} esqueryOptions `esquery` options for traversing custom nodes.
+     * @returns {NodeEventGenerator} new instance
+     */
+    constructor(emitter, esqueryOptions) {
+        this.emitter = emitter;
+        this.esqueryOptions = esqueryOptions;
+        this.currentAncestry = [];
+        this.enterSelectorsByNodeType = new Map();
+        this.exitSelectorsByNodeType = new Map();
+        this.anyTypeEnterSelectors = [];
+        this.anyTypeExitSelectors = [];
+
+        emitter.eventNames().forEach(rawSelector => {
+            const selector = parseSelector(rawSelector);
+
+            if (selector.listenerTypes) {
+                const typeMap = selector.isExit ? this.exitSelectorsByNodeType : this.enterSelectorsByNodeType;
+
+                selector.listenerTypes.forEach(nodeType => {
+                    if (!typeMap.has(nodeType)) {
+                        typeMap.set(nodeType, []);
+                    }
+                    typeMap.get(nodeType).push(selector);
+                });
+                return;
+            }
+            const selectors = selector.isExit ? this.anyTypeExitSelectors : this.anyTypeEnterSelectors;
+
+            selectors.push(selector);
+        });
+
+        this.anyTypeEnterSelectors.sort(compareSpecificity);
+        this.anyTypeExitSelectors.sort(compareSpecificity);
+        this.enterSelectorsByNodeType.forEach(selectorList => selectorList.sort(compareSpecificity));
+        this.exitSelectorsByNodeType.forEach(selectorList => selectorList.sort(compareSpecificity));
+    }
+
+    /**
+     * Checks a selector against a node, and emits it if it matches
+     * @param {ASTNode} node The node to check
+     * @param {ASTSelector} selector An AST selector descriptor
+     * @returns {void}
+     */
+    applySelector(node, selector) {
+        if (esquery.matches(node, selector.parsedSelector, this.currentAncestry, this.esqueryOptions)) {
+            this.emitter.emit(selector.rawSelector, node);
+        }
+    }
+
+    /**
+     * Applies all appropriate selectors to a node, in specificity order
+     * @param {ASTNode} node The node to check
+     * @param {boolean} isExit `false` if the node is currently being entered, `true` if it's currently being exited
+     * @returns {void}
+     */
+    applySelectors(node, isExit) {
+        const selectorsByNodeType = (isExit ? this.exitSelectorsByNodeType : this.enterSelectorsByNodeType).get(node.type) || [];
+        const anyTypeSelectors = isExit ? this.anyTypeExitSelectors : this.anyTypeEnterSelectors;
+
+        /*
+         * selectorsByNodeType and anyTypeSelectors were already sorted by specificity in the constructor.
+         * Iterate through each of them, applying selectors in the right order.
+         */
+        let selectorsByTypeIndex = 0;
+        let anyTypeSelectorsIndex = 0;
+
+        while (selectorsByTypeIndex < selectorsByNodeType.length || anyTypeSelectorsIndex < anyTypeSelectors.length) {
+            if (
+                selectorsByTypeIndex >= selectorsByNodeType.length ||
+                anyTypeSelectorsIndex < anyTypeSelectors.length &&
+                compareSpecificity(anyTypeSelectors[anyTypeSelectorsIndex], selectorsByNodeType[selectorsByTypeIndex]) < 0
+            ) {
+                this.applySelector(node, anyTypeSelectors[anyTypeSelectorsIndex++]);
+            } else {
+                this.applySelector(node, selectorsByNodeType[selectorsByTypeIndex++]);
+            }
+        }
+    }
+
+    /**
+     * Emits an event of entering AST node.
+     * @param {ASTNode} node A node which was entered.
+     * @returns {void}
+     */
+    enterNode(node) {
+        if (node.parent) {
+            this.currentAncestry.unshift(node.parent);
+        }
+        this.applySelectors(node, false);
+    }
+
+    /**
+     * Emits an event of leaving AST node.
+     * @param {ASTNode} node A node which was left.
+     * @returns {void}
+     */
+    leaveNode(node) {
+        this.applySelectors(node, true);
+        this.currentAncestry.shift();
+    }
+}
+
+module.exports = NodeEventGenerator;

node_modules/eslint/lib/linter/report-translator.js

@@ -0,0 +1,368 @@
+/**
+ * @fileoverview A helper that translates context.report() calls from the rule API into generic problem objects
+ * @author Teddy Katz
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const assert = require("assert");
+const ruleFixer = require("./rule-fixer");
+const interpolate = require("./interpolate");
+
+//------------------------------------------------------------------------------
+// Typedefs
+//------------------------------------------------------------------------------
+
+/**
+ * An error message description
+ * @typedef {Object} MessageDescriptor
+ * @property {ASTNode} [node] The reported node
+ * @property {Location} loc The location of the problem.
+ * @property {string} message The problem message.
+ * @property {Object} [data] Optional data to use to fill in placeholders in the
+ *      message.
+ * @property {Function} [fix] The function to call that creates a fix command.
+ * @property {Array<{desc?: string, messageId?: string, fix: Function}>} suggest Suggestion descriptions and functions to create a the associated fixes.
+ */
+
+/**
+ * Information about the report
+ * @typedef {Object} ReportInfo
+ * @property {string} ruleId
+ * @property {(0|1|2)} severity
+ * @property {(string|undefined)} message
+ * @property {(string|undefined)} [messageId]
+ * @property {number} line
+ * @property {number} column
+ * @property {(number|undefined)} [endLine]
+ * @property {(number|undefined)} [endColumn]
+ * @property {(string|null)} nodeType
+ * @property {string} source
+ * @property {({text: string, range: (number[]|null)}|null)} [fix]
+ * @property {Array<{text: string, range: (number[]|null)}|null>} [suggestions]
+ */
+
+//------------------------------------------------------------------------------
+// Module Definition
+//------------------------------------------------------------------------------
+
+
+/**
+ * Translates a multi-argument context.report() call into a single object argument call
+ * @param {...*} args A list of arguments passed to `context.report`
+ * @returns {MessageDescriptor} A normalized object containing report information
+ */
+function normalizeMultiArgReportCall(...args) {
+
+    // If there is one argument, it is considered to be a new-style call already.
+    if (args.length === 1) {
+
+        // Shallow clone the object to avoid surprises if reusing the descriptor
+        return Object.assign({}, args[0]);
+    }
+
+    // If the second argument is a string, the arguments are interpreted as [node, message, data, fix].
+    if (typeof args[1] === "string") {
+        return {
+            node: args[0],
+            message: args[1],
+            data: args[2],
+            fix: args[3]
+        };
+    }
+
+    // Otherwise, the arguments are interpreted as [node, loc, message, data, fix].
+    return {
+        node: args[0],
+        loc: args[1],
+        message: args[2],
+        data: args[3],
+        fix: args[4]
+    };
+}
+
+/**
+ * Asserts that either a loc or a node was provided, and the node is valid if it was provided.
+ * @param {MessageDescriptor} descriptor A descriptor to validate
+ * @returns {void}
+ * @throws AssertionError if neither a node nor a loc was provided, or if the node is not an object
+ */
+function assertValidNodeInfo(descriptor) {
+    if (descriptor.node) {
+        assert(typeof descriptor.node === "object", "Node must be an object");
+    } else {
+        assert(descriptor.loc, "Node must be provided when reporting error if location is not provided");
+    }
+}
+
+/**
+ * Normalizes a MessageDescriptor to always have a `loc` with `start` and `end` properties
+ * @param {MessageDescriptor} descriptor A descriptor for the report from a rule.
+ * @returns {{start: Location, end: (Location|null)}} An updated location that infers the `start` and `end` properties
+ * from the `node` of the original descriptor, or infers the `start` from the `loc` of the original descriptor.
+ */
+function normalizeReportLoc(descriptor) {
+    if (descriptor.loc) {
+        if (descriptor.loc.start) {
+            return descriptor.loc;
+        }
+        return { start: descriptor.loc, end: null };
+    }
+    return descriptor.node.loc;
+}
+
+/**
+ * Check that a fix has a valid range.
+ * @param {Fix|null} fix The fix to validate.
+ * @returns {void}
+ */
+function assertValidFix(fix) {
+    if (fix) {
+        assert(fix.range && typeof fix.range[0] === "number" && typeof fix.range[1] === "number", `Fix has invalid range: ${JSON.stringify(fix, null, 2)}`);
+    }
+}
+
+/**
+ * Compares items in a fixes array by range.
+ * @param {Fix} a The first message.
+ * @param {Fix} b The second message.
+ * @returns {int} -1 if a comes before b, 1 if a comes after b, 0 if equal.
+ * @private
+ */
+function compareFixesByRange(a, b) {
+    return a.range[0] - b.range[0] || a.range[1] - b.range[1];
+}
+
+/**
+ * Merges the given fixes array into one.
+ * @param {Fix[]} fixes The fixes to merge.
+ * @param {SourceCode} sourceCode The source code object to get the text between fixes.
+ * @returns {{text: string, range: number[]}} The merged fixes
+ */
+function mergeFixes(fixes, sourceCode) {
+    for (const fix of fixes) {
+        assertValidFix(fix);
+    }
+
+    if (fixes.length === 0) {
+        return null;
+    }
+    if (fixes.length === 1) {
+        return fixes[0];
+    }
+
+    fixes.sort(compareFixesByRange);
+
+    const originalText = sourceCode.text;
+    const start = fixes[0].range[0];
+    const end = fixes[fixes.length - 1].range[1];
+    let text = "";
+    let lastPos = Number.MIN_SAFE_INTEGER;
+
+    for (const fix of fixes) {
+        assert(fix.range[0] >= lastPos, "Fix objects must not be overlapped in a report.");
+
+        if (fix.range[0] >= 0) {
+            text += originalText.slice(Math.max(0, start, lastPos), fix.range[0]);
+        }
+        text += fix.text;
+        lastPos = fix.range[1];
+    }
+    text += originalText.slice(Math.max(0, start, lastPos), end);
+
+    return { range: [start, end], text };
+}
+
+/**
+ * Gets one fix object from the given descriptor.
+ * If the descriptor retrieves multiple fixes, this merges those to one.
+ * @param {MessageDescriptor} descriptor The report descriptor.
+ * @param {SourceCode} sourceCode The source code object to get text between fixes.
+ * @returns {({text: string, range: number[]}|null)} The fix for the descriptor
+ */
+function normalizeFixes(descriptor, sourceCode) {
+    if (typeof descriptor.fix !== "function") {
+        return null;
+    }
+
+    // @type {null | Fix | Fix[] | IterableIterator<Fix>}
+    const fix = descriptor.fix(ruleFixer);
+
+    // Merge to one.
+    if (fix && Symbol.iterator in fix) {
+        return mergeFixes(Array.from(fix), sourceCode);
+    }
+
+    assertValidFix(fix);
+    return fix;
+}
+
+/**
+ * Gets an array of suggestion objects from the given descriptor.
+ * @param {MessageDescriptor} descriptor The report descriptor.
+ * @param {SourceCode} sourceCode The source code object to get text between fixes.
+ * @param {Object} messages Object of meta messages for the rule.
+ * @returns {Array<SuggestionResult>} The suggestions for the descriptor
+ */
+function mapSuggestions(descriptor, sourceCode, messages) {
+    if (!descriptor.suggest || !Array.isArray(descriptor.suggest)) {
+        return [];
+    }
+
+    return descriptor.suggest
+        .map(suggestInfo => {
+            const computedDesc = suggestInfo.desc || messages[suggestInfo.messageId];
+
+            return {
+                ...suggestInfo,
+                desc: interpolate(computedDesc, suggestInfo.data),
+                fix: normalizeFixes(suggestInfo, sourceCode)
+            };
+        })
+
+        // Remove suggestions that didn't provide a fix
+        .filter(({ fix }) => fix);
+}
+
+/**
+ * Creates information about the report from a descriptor
+ * @param {Object} options Information about the problem
+ * @param {string} options.ruleId Rule ID
+ * @param {(0|1|2)} options.severity Rule severity
+ * @param {(ASTNode|null)} options.node Node
+ * @param {string} options.message Error message
+ * @param {string} [options.messageId] The error message ID.
+ * @param {{start: SourceLocation, end: (SourceLocation|null)}} options.loc Start and end location
+ * @param {{text: string, range: (number[]|null)}} options.fix The fix object
+ * @param {Array<{text: string, range: (number[]|null)}>} options.suggestions The array of suggestions objects
+ * @returns {function(...args): ReportInfo} Function that returns information about the report
+ */
+function createProblem(options) {
+    const problem = {
+        ruleId: options.ruleId,
+        severity: options.severity,
+        message: options.message,
+        line: options.loc.start.line,
+        column: options.loc.start.column + 1,
+        nodeType: options.node && options.node.type || null
+    };
+
+    /*
+     * If this isn’t in the conditional, some of the tests fail
+     * because `messageId` is present in the problem object
+     */
+    if (options.messageId) {
+        problem.messageId = options.messageId;
+    }
+
+    if (options.loc.end) {
+        problem.endLine = options.loc.end.line;
+        problem.endColumn = options.loc.end.column + 1;
+    }
+
+    if (options.fix) {
+        problem.fix = options.fix;
+    }
+
+    if (options.suggestions && options.suggestions.length > 0) {
+        problem.suggestions = options.suggestions;
+    }
+
+    return problem;
+}
+
+/**
+ * Validates that suggestions are properly defined. Throws if an error is detected.
+ * @param {Array<{ desc?: string, messageId?: string }>} suggest The incoming suggest data.
+ * @param {Object} messages Object of meta messages for the rule.
+ * @returns {void}
+ */
+function validateSuggestions(suggest, messages) {
+    if (suggest && Array.isArray(suggest)) {
+        suggest.forEach(suggestion => {
+            if (suggestion.messageId) {
+                const { messageId } = suggestion;
+
+                if (!messages) {
+                    throw new TypeError(`context.report() called with a suggest option with a messageId '${messageId}', but no messages were present in the rule metadata.`);
+                }
+
+                if (!messages[messageId]) {
+                    throw new TypeError(`context.report() called with a suggest option with a messageId '${messageId}' which is not present in the 'messages' config: ${JSON.stringify(messages, null, 2)}`);
+                }
+
+                if (suggestion.desc) {
+                    throw new TypeError("context.report() called with a suggest option that defines both a 'messageId' and an 'desc'. Please only pass one.");
+                }
+            } else if (!suggestion.desc) {
+                throw new TypeError("context.report() called with a suggest option that doesn't have either a `desc` or `messageId`");
+            }
+
+            if (typeof suggestion.fix !== "function") {
+                throw new TypeError(`context.report() called with a suggest option without a fix function. See: ${suggestion}`);
+            }
+        });
+    }
+}
+
+/**
+ * Returns a function that converts the arguments of a `context.report` call from a rule into a reported
+ * problem for the Node.js API.
+ * @param {{ruleId: string, severity: number, sourceCode: SourceCode, messageIds: Object, disableFixes: boolean}} metadata Metadata for the reported problem
+ * @param {SourceCode} sourceCode The `SourceCode` instance for the text being linted
+ * @returns {function(...args): ReportInfo} Function that returns information about the report
+ */
+
+module.exports = function createReportTranslator(metadata) {
+
+    /*
+     * `createReportTranslator` gets called once per enabled rule per file. It needs to be very performant.
+     * The report translator itself (i.e. the function that `createReportTranslator` returns) gets
+     * called every time a rule reports a problem, which happens much less frequently (usually, the vast
+     * majority of rules don't report any problems for a given file).
+     */
+    return (...args) => {
+        const descriptor = normalizeMultiArgReportCall(...args);
+        const messages = metadata.messageIds;
+
+        assertValidNodeInfo(descriptor);
+
+        let computedMessage;
+
+        if (descriptor.messageId) {
+            if (!messages) {
+                throw new TypeError("context.report() called with a messageId, but no messages were present in the rule metadata.");
+            }
+            const id = descriptor.messageId;
+
+            if (descriptor.message) {
+                throw new TypeError("context.report() called with a message and a messageId. Please only pass one.");
+            }
+            if (!messages || !Object.prototype.hasOwnProperty.call(messages, id)) {
+                throw new TypeError(`context.report() called with a messageId of '${id}' which is not present in the 'messages' config: ${JSON.stringify(messages, null, 2)}`);
+            }
+            computedMessage = messages[id];
+        } else if (descriptor.message) {
+            computedMessage = descriptor.message;
+        } else {
+            throw new TypeError("Missing `message` property in report() call; add a message that describes the linting problem.");
+        }
+
+        validateSuggestions(descriptor.suggest, messages);
+
+        return createProblem({
+            ruleId: metadata.ruleId,
+            severity: metadata.severity,
+            node: descriptor.node,
+            message: interpolate(computedMessage, descriptor.data),
+            messageId: descriptor.messageId,
+            loc: normalizeReportLoc(descriptor),
+            fix: metadata.disableFixes ? null : normalizeFixes(descriptor, metadata.sourceCode),
+            suggestions: metadata.disableFixes ? [] : mapSuggestions(descriptor, metadata.sourceCode, messages)
+        });
+    };
+};

node_modules/eslint/lib/linter/rule-fixer.js

@@ -0,0 +1,140 @@
+/**
+ * @fileoverview An object that creates fix commands for rules.
+ * @author Nicholas C. Zakas
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+// none!
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Creates a fix command that inserts text at the specified index in the source text.
+ * @param {int} index The 0-based index at which to insert the new text.
+ * @param {string} text The text to insert.
+ * @returns {Object} The fix command.
+ * @private
+ */
+function insertTextAt(index, text) {
+    return {
+        range: [index, index],
+        text
+    };
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * Creates code fixing commands for rules.
+ */
+
+const ruleFixer = Object.freeze({
+
+    /**
+     * Creates a fix command that inserts text after the given node or token.
+     * The fix is not applied until applyFixes() is called.
+     * @param {ASTNode|Token} nodeOrToken The node or token to insert after.
+     * @param {string} text The text to insert.
+     * @returns {Object} The fix command.
+     */
+    insertTextAfter(nodeOrToken, text) {
+        return this.insertTextAfterRange(nodeOrToken.range, text);
+    },
+
+    /**
+     * Creates a fix command that inserts text after the specified range in the source text.
+     * The fix is not applied until applyFixes() is called.
+     * @param {int[]} range The range to replace, first item is start of range, second
+     *      is end of range.
+     * @param {string} text The text to insert.
+     * @returns {Object} The fix command.
+     */
+    insertTextAfterRange(range, text) {
+        return insertTextAt(range[1], text);
+    },
+
+    /**
+     * Creates a fix command that inserts text before the given node or token.
+     * The fix is not applied until applyFixes() is called.
+     * @param {ASTNode|Token} nodeOrToken The node or token to insert before.
+     * @param {string} text The text to insert.
+     * @returns {Object} The fix command.
+     */
+    insertTextBefore(nodeOrToken, text) {
+        return this.insertTextBeforeRange(nodeOrToken.range, text);
+    },
+
+    /**
+     * Creates a fix command that inserts text before the specified range in the source text.
+     * The fix is not applied until applyFixes() is called.
+     * @param {int[]} range The range to replace, first item is start of range, second
+     *      is end of range.
+     * @param {string} text The text to insert.
+     * @returns {Object} The fix command.
+     */
+    insertTextBeforeRange(range, text) {
+        return insertTextAt(range[0], text);
+    },
+
+    /**
+     * Creates a fix command that replaces text at the node or token.
+     * The fix is not applied until applyFixes() is called.
+     * @param {ASTNode|Token} nodeOrToken The node or token to remove.
+     * @param {string} text The text to insert.
+     * @returns {Object} The fix command.
+     */
+    replaceText(nodeOrToken, text) {
+        return this.replaceTextRange(nodeOrToken.range, text);
+    },
+
+    /**
+     * Creates a fix command that replaces text at the specified range in the source text.
+     * The fix is not applied until applyFixes() is called.
+     * @param {int[]} range The range to replace, first item is start of range, second
+     *      is end of range.
+     * @param {string} text The text to insert.
+     * @returns {Object} The fix command.
+     */
+    replaceTextRange(range, text) {
+        return {
+            range,
+            text
+        };
+    },
+
+    /**
+     * Creates a fix command that removes the node or token from the source.
+     * The fix is not applied until applyFixes() is called.
+     * @param {ASTNode|Token} nodeOrToken The node or token to remove.
+     * @returns {Object} The fix command.
+     */
+    remove(nodeOrToken) {
+        return this.removeRange(nodeOrToken.range);
+    },
+
+    /**
+     * Creates a fix command that removes the specified range of text from the source.
+     * The fix is not applied until applyFixes() is called.
+     * @param {int[]} range The range to remove, first item is start of range, second
+     *      is end of range.
+     * @returns {Object} The fix command.
+     */
+    removeRange(range) {
+        return {
+            range,
+            text: ""
+        };
+    }
+
+});
+
+
+module.exports = ruleFixer;

node_modules/eslint/lib/linter/rules.js

@@ -0,0 +1,77 @@
+/**
+ * @fileoverview Defines a storage for rules.
+ * @author Nicholas C. Zakas
+ * @author aladdin-add
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const builtInRules = require("../rules");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Normalizes a rule module to the new-style API
+ * @param {(Function|{create: Function})} rule A rule object, which can either be a function
+ * ("old-style") or an object with a `create` method ("new-style")
+ * @returns {{create: Function}} A new-style rule.
+ */
+function normalizeRule(rule) {
+    return typeof rule === "function" ? Object.assign({ create: rule }, rule) : rule;
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+class Rules {
+    constructor() {
+        this._rules = Object.create(null);
+    }
+
+    /**
+     * Registers a rule module for rule id in storage.
+     * @param {string} ruleId Rule id (file name).
+     * @param {Function} ruleModule Rule handler.
+     * @returns {void}
+     */
+    define(ruleId, ruleModule) {
+        this._rules[ruleId] = normalizeRule(ruleModule);
+    }
+
+    /**
+     * Access rule handler by id (file name).
+     * @param {string} ruleId Rule id (file name).
+     * @returns {{create: Function, schema: JsonSchema[]}}
+     * A rule. This is normalized to always have the new-style shape with a `create` method.
+     */
+    get(ruleId) {
+        if (typeof this._rules[ruleId] === "string") {
+            this.define(ruleId, require(this._rules[ruleId]));
+        }
+        if (this._rules[ruleId]) {
+            return this._rules[ruleId];
+        }
+        if (builtInRules.has(ruleId)) {
+            return builtInRules.get(ruleId);
+        }
+
+        return null;
+    }
+
+    *[Symbol.iterator]() {
+        yield* builtInRules;
+
+        for (const ruleId of Object.keys(this._rules)) {
+            yield [ruleId, this.get(ruleId)];
+        }
+    }
+}
+
+module.exports = Rules;

node_modules/eslint/lib/linter/safe-emitter.js

@@ -0,0 +1,52 @@
+/**
+ * @fileoverview A variant of EventEmitter which does not give listeners information about each other
+ * @author Teddy Katz
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Typedefs
+//------------------------------------------------------------------------------
+
+/**
+ * An event emitter
+ * @typedef {Object} SafeEmitter
+ * @property {function(eventName: string, listenerFunc: Function): void} on Adds a listener for a given event name
+ * @property {function(eventName: string, arg1?: any, arg2?: any, arg3?: any)} emit Emits an event with a given name.
+ * This calls all the listeners that were listening for that name, with `arg1`, `arg2`, and `arg3` as arguments.
+ * @property {function(): string[]} eventNames Gets the list of event names that have registered listeners.
+ */
+
+/**
+ * Creates an object which can listen for and emit events.
+ * This is similar to the EventEmitter API in Node's standard library, but it has a few differences.
+ * The goal is to allow multiple modules to attach arbitrary listeners to the same emitter, without
+ * letting the modules know about each other at all.
+ * 1. It has no special keys like `error` and `newListener`, which would allow modules to detect when
+ * another module throws an error or registers a listener.
+ * 2. It calls listener functions without any `this` value. (`EventEmitter` calls listeners with a
+ * `this` value of the emitter instance, which would give listeners access to other listeners.)
+ * @returns {SafeEmitter} An emitter
+ */
+module.exports = () => {
+    const listeners = Object.create(null);
+
+    return Object.freeze({
+        on(eventName, listener) {
+            if (eventName in listeners) {
+                listeners[eventName].push(listener);
+            } else {
+                listeners[eventName] = [listener];
+            }
+        },
+        emit(eventName, ...args) {
+            if (eventName in listeners) {
+                listeners[eventName].forEach(listener => listener(...args));
+            }
+        },
+        eventNames() {
+            return Object.keys(listeners);
+        }
+    });
+};

node_modules/eslint/lib/linter/source-code-fixer.js

@@ -0,0 +1,152 @@
+/**
+ * @fileoverview An object that caches and applies source code fixes.
+ * @author Nicholas C. Zakas
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const debug = require("debug")("eslint:source-code-fixer");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+const BOM = "\uFEFF";
+
+/**
+ * Compares items in a messages array by range.
+ * @param {Message} a The first message.
+ * @param {Message} b The second message.
+ * @returns {int} -1 if a comes before b, 1 if a comes after b, 0 if equal.
+ * @private
+ */
+function compareMessagesByFixRange(a, b) {
+    return a.fix.range[0] - b.fix.range[0] || a.fix.range[1] - b.fix.range[1];
+}
+
+/**
+ * Compares items in a messages array by line and column.
+ * @param {Message} a The first message.
+ * @param {Message} b The second message.
+ * @returns {int} -1 if a comes before b, 1 if a comes after b, 0 if equal.
+ * @private
+ */
+function compareMessagesByLocation(a, b) {
+    return a.line - b.line || a.column - b.column;
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * Utility for apply fixes to source code.
+ * @constructor
+ */
+function SourceCodeFixer() {
+    Object.freeze(this);
+}
+
+/**
+ * Applies the fixes specified by the messages to the given text. Tries to be
+ * smart about the fixes and won't apply fixes over the same area in the text.
+ * @param {string} sourceText The text to apply the changes to.
+ * @param {Message[]} messages The array of messages reported by ESLint.
+ * @param {boolean|Function} [shouldFix=true] Determines whether each message should be fixed
+ * @returns {Object} An object containing the fixed text and any unfixed messages.
+ */
+SourceCodeFixer.applyFixes = function(sourceText, messages, shouldFix) {
+    debug("Applying fixes");
+
+    if (shouldFix === false) {
+        debug("shouldFix parameter was false, not attempting fixes");
+        return {
+            fixed: false,
+            messages,
+            output: sourceText
+        };
+    }
+
+    // clone the array
+    const remainingMessages = [],
+        fixes = [],
+        bom = sourceText.startsWith(BOM) ? BOM : "",
+        text = bom ? sourceText.slice(1) : sourceText;
+    let lastPos = Number.NEGATIVE_INFINITY,
+        output = bom;
+
+    /**
+     * Try to use the 'fix' from a problem.
+     * @param   {Message} problem The message object to apply fixes from
+     * @returns {boolean}         Whether fix was successfully applied
+     */
+    function attemptFix(problem) {
+        const fix = problem.fix;
+        const start = fix.range[0];
+        const end = fix.range[1];
+
+        // Remain it as a problem if it's overlapped or it's a negative range
+        if (lastPos >= start || start > end) {
+            remainingMessages.push(problem);
+            return false;
+        }
+
+        // Remove BOM.
+        if ((start < 0 && end >= 0) || (start === 0 && fix.text.startsWith(BOM))) {
+            output = "";
+        }
+
+        // Make output to this fix.
+        output += text.slice(Math.max(0, lastPos), Math.max(0, start));
+        output += fix.text;
+        lastPos = end;
+        return true;
+    }
+
+    messages.forEach(problem => {
+        if (Object.prototype.hasOwnProperty.call(problem, "fix")) {
+            fixes.push(problem);
+        } else {
+            remainingMessages.push(problem);
+        }
+    });
+
+    if (fixes.length) {
+        debug("Found fixes to apply");
+        let fixesWereApplied = false;
+
+        for (const problem of fixes.sort(compareMessagesByFixRange)) {
+            if (typeof shouldFix !== "function" || shouldFix(problem)) {
+                attemptFix(problem);
+
+                /*
+                 * The only time attemptFix will fail is if a previous fix was
+                 * applied which conflicts with it.  So we can mark this as true.
+                 */
+                fixesWereApplied = true;
+            } else {
+                remainingMessages.push(problem);
+            }
+        }
+        output += text.slice(Math.max(0, lastPos));
+
+        return {
+            fixed: fixesWereApplied,
+            messages: remainingMessages.sort(compareMessagesByLocation),
+            output
+        };
+    }
+
+    debug("No fixes to apply");
+    return {
+        fixed: false,
+        messages,
+        output: bom + text
+    };
+
+};
+
+module.exports = SourceCodeFixer;

node_modules/eslint/lib/linter/timing.js

@@ -0,0 +1,160 @@
+/**
+ * @fileoverview Tracks performance of individual rules.
+ * @author Brandon Mills
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/* istanbul ignore next */
+/**
+ * Align the string to left
+ * @param {string} str string to evaluate
+ * @param {int} len length of the string
+ * @param {string} ch delimiter character
+ * @returns {string} modified string
+ * @private
+ */
+function alignLeft(str, len, ch) {
+    return str + new Array(len - str.length + 1).join(ch || " ");
+}
+
+/* istanbul ignore next */
+/**
+ * Align the string to right
+ * @param {string} str string to evaluate
+ * @param {int} len length of the string
+ * @param {string} ch delimiter character
+ * @returns {string} modified string
+ * @private
+ */
+function alignRight(str, len, ch) {
+    return new Array(len - str.length + 1).join(ch || " ") + str;
+}
+
+//------------------------------------------------------------------------------
+// Module definition
+//------------------------------------------------------------------------------
+
+const enabled = !!process.env.TIMING;
+
+const HEADERS = ["Rule", "Time (ms)", "Relative"];
+const ALIGN = [alignLeft, alignRight, alignRight];
+
+/**
+ * Decide how many rules to show in the output list.
+ * @returns {number} the number of rules to show
+ */
+function getListSize() {
+    const MINIMUM_SIZE = 10;
+
+    if (typeof process.env.TIMING !== "string") {
+        return MINIMUM_SIZE;
+    }
+
+    if (process.env.TIMING.toLowerCase() === "all") {
+        return Number.POSITIVE_INFINITY;
+    }
+
+    const TIMING_ENV_VAR_AS_INTEGER = Number.parseInt(process.env.TIMING, 10);
+
+    return TIMING_ENV_VAR_AS_INTEGER > 10 ? TIMING_ENV_VAR_AS_INTEGER : MINIMUM_SIZE;
+}
+
+/* istanbul ignore next */
+/**
+ * display the data
+ * @param {Object} data Data object to be displayed
+ * @returns {void} prints modified string with console.log
+ * @private
+ */
+function display(data) {
+    let total = 0;
+    const rows = Object.keys(data)
+        .map(key => {
+            const time = data[key];
+
+            total += time;
+            return [key, time];
+        })
+        .sort((a, b) => b[1] - a[1])
+        .slice(0, getListSize());
+
+    rows.forEach(row => {
+        row.push(`${(row[1] * 100 / total).toFixed(1)}%`);
+        row[1] = row[1].toFixed(3);
+    });
+
+    rows.unshift(HEADERS);
+
+    const widths = [];
+
+    rows.forEach(row => {
+        const len = row.length;
+
+        for (let i = 0; i < len; i++) {
+            const n = row[i].length;
+
+            if (!widths[i] || n > widths[i]) {
+                widths[i] = n;
+            }
+        }
+    });
+
+    const table = rows.map(row => (
+        row
+            .map((cell, index) => ALIGN[index](cell, widths[index]))
+            .join(" | ")
+    ));
+
+    table.splice(1, 0, widths.map((width, index) => {
+        const extraAlignment = index !== 0 && index !== widths.length - 1 ? 2 : 1;
+
+        return ALIGN[index](":", width + extraAlignment, "-");
+    }).join("|"));
+
+    console.log(table.join("\n")); // eslint-disable-line no-console
+}
+
+/* istanbul ignore next */
+module.exports = (function() {
+
+    const data = Object.create(null);
+
+    /**
+     * Time the run
+     * @param {*} key key from the data object
+     * @param {Function} fn function to be called
+     * @returns {Function} function to be executed
+     * @private
+     */
+    function time(key, fn) {
+        if (typeof data[key] === "undefined") {
+            data[key] = 0;
+        }
+
+        return function(...args) {
+            let t = process.hrtime();
+
+            fn(...args);
+            t = process.hrtime(t);
+            data[key] += t[0] * 1e3 + t[1] / 1e6;
+        };
+    }
+
+    if (enabled) {
+        process.on("exit", () => {
+            display(data);
+        });
+    }
+
+    return {
+        time,
+        enabled,
+        getListSize
+    };
+
+}());

node_modules/eslint/lib/options.js

@@ -0,0 +1,323 @@
+/**
+ * @fileoverview Options configuration for optionator.
+ * @author George Zahariev
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const optionator = require("optionator");
+
+//------------------------------------------------------------------------------
+// Typedefs
+//------------------------------------------------------------------------------
+
+/**
+ * The options object parsed by Optionator.
+ * @typedef {Object} ParsedCLIOptions
+ * @property {boolean} cache Only check changed files
+ * @property {string} cacheFile Path to the cache file. Deprecated: use --cache-location
+ * @property {string} [cacheLocation] Path to the cache file or directory
+ * @property {"metadata" | "content"} cacheStrategy Strategy to use for detecting changed files in the cache
+ * @property {boolean} [color] Force enabling/disabling of color
+ * @property {string} [config] Use this configuration, overriding .eslintrc.* config options if present
+ * @property {boolean} debug Output debugging information
+ * @property {string[]} [env] Specify environments
+ * @property {boolean} envInfo Output execution environment information
+ * @property {boolean} errorOnUnmatchedPattern Prevent errors when pattern is unmatched
+ * @property {boolean} eslintrc Disable use of configuration from .eslintrc.*
+ * @property {string[]} [ext] Specify JavaScript file extensions
+ * @property {boolean} fix Automatically fix problems
+ * @property {boolean} fixDryRun Automatically fix problems without saving the changes to the file system
+ * @property {("problem" | "suggestion" | "layout")[]} [fixType] Specify the types of fixes to apply (problem, suggestion, layout)
+ * @property {string} format Use a specific output format
+ * @property {string[]} [global] Define global variables
+ * @property {boolean} [help] Show help
+ * @property {boolean} ignore Disable use of ignore files and patterns
+ * @property {string} [ignorePath] Specify path of ignore file
+ * @property {string[]} [ignorePattern] Pattern of files to ignore (in addition to those in .eslintignore)
+ * @property {boolean} init Run config initialization wizard
+ * @property {boolean} inlineConfig Prevent comments from changing config or rules
+ * @property {number} maxWarnings Number of warnings to trigger nonzero exit code
+ * @property {string} [outputFile] Specify file to write report to
+ * @property {string} [parser] Specify the parser to be used
+ * @property {Object} [parserOptions] Specify parser options
+ * @property {string[]} [plugin] Specify plugins
+ * @property {string} [printConfig] Print the configuration for the given file
+ * @property {boolean | undefined} reportUnusedDisableDirectives Adds reported errors for unused eslint-disable directives
+ * @property {string} [resolvePluginsRelativeTo] A folder where plugins should be resolved from, CWD by default
+ * @property {Object} [rule] Specify rules
+ * @property {string[]} [rulesdir] Use additional rules from this directory
+ * @property {boolean} stdin Lint code provided on <STDIN>
+ * @property {string} [stdinFilename] Specify filename to process STDIN as
+ * @property {boolean} quiet Report errors only
+ * @property {boolean} [version] Output the version number
+ * @property {string[]} _ Positional filenames or patterns
+ */
+
+//------------------------------------------------------------------------------
+// Initialization and Public Interface
+//------------------------------------------------------------------------------
+
+// exports "parse(args)", "generateHelp()", and "generateHelpForOption(optionName)"
+module.exports = optionator({
+    prepend: "eslint [options] file.js [file.js] [dir]",
+    defaults: {
+        concatRepeatedArrays: true,
+        mergeRepeatedObjects: true
+    },
+    options: [
+        {
+            heading: "Basic configuration"
+        },
+        {
+            option: "eslintrc",
+            type: "Boolean",
+            default: "true",
+            description: "Disable use of configuration from .eslintrc.*"
+        },
+        {
+            option: "config",
+            alias: "c",
+            type: "path::String",
+            description: "Use this configuration, overriding .eslintrc.* config options if present"
+        },
+        {
+            option: "env",
+            type: "[String]",
+            description: "Specify environments"
+        },
+        {
+            option: "ext",
+            type: "[String]",
+            description: "Specify JavaScript file extensions"
+        },
+        {
+            option: "global",
+            type: "[String]",
+            description: "Define global variables"
+        },
+        {
+            option: "parser",
+            type: "String",
+            description: "Specify the parser to be used"
+        },
+        {
+            option: "parser-options",
+            type: "Object",
+            description: "Specify parser options"
+        },
+        {
+            option: "resolve-plugins-relative-to",
+            type: "path::String",
+            description: "A folder where plugins should be resolved from, CWD by default"
+        },
+        {
+            heading: "Specifying rules and plugins"
+        },
+        {
+            option: "rulesdir",
+            type: "[path::String]",
+            description: "Use additional rules from this directory"
+        },
+        {
+            option: "plugin",
+            type: "[String]",
+            description: "Specify plugins"
+        },
+        {
+            option: "rule",
+            type: "Object",
+            description: "Specify rules"
+        },
+        {
+            heading: "Fixing problems"
+        },
+        {
+            option: "fix",
+            type: "Boolean",
+            default: false,
+            description: "Automatically fix problems"
+        },
+        {
+            option: "fix-dry-run",
+            type: "Boolean",
+            default: false,
+            description: "Automatically fix problems without saving the changes to the file system"
+        },
+        {
+            option: "fix-type",
+            type: "Array",
+            description: "Specify the types of fixes to apply (problem, suggestion, layout)"
+        },
+        {
+            heading: "Ignoring files"
+        },
+        {
+            option: "ignore-path",
+            type: "path::String",
+            description: "Specify path of ignore file"
+        },
+        {
+            option: "ignore",
+            type: "Boolean",
+            default: "true",
+            description: "Disable use of ignore files and patterns"
+        },
+        {
+            option: "ignore-pattern",
+            type: "[String]",
+            description: "Pattern of files to ignore (in addition to those in .eslintignore)",
+            concatRepeatedArrays: [true, {
+                oneValuePerFlag: true
+            }]
+        },
+        {
+            heading: "Using stdin"
+        },
+        {
+            option: "stdin",
+            type: "Boolean",
+            default: "false",
+            description: "Lint code provided on <STDIN>"
+        },
+        {
+            option: "stdin-filename",
+            type: "String",
+            description: "Specify filename to process STDIN as"
+        },
+        {
+            heading: "Handling warnings"
+        },
+        {
+            option: "quiet",
+            type: "Boolean",
+            default: "false",
+            description: "Report errors only"
+        },
+        {
+            option: "max-warnings",
+            type: "Int",
+            default: "-1",
+            description: "Number of warnings to trigger nonzero exit code"
+        },
+        {
+            heading: "Output"
+        },
+        {
+            option: "output-file",
+            alias: "o",
+            type: "path::String",
+            description: "Specify file to write report to"
+        },
+        {
+            option: "format",
+            alias: "f",
+            type: "String",
+            default: "stylish",
+            description: "Use a specific output format"
+        },
+        {
+            option: "color",
+            type: "Boolean",
+            alias: "no-color",
+            description: "Force enabling/disabling of color"
+        },
+        {
+            heading: "Inline configuration comments"
+        },
+        {
+            option: "inline-config",
+            type: "Boolean",
+            default: "true",
+            description: "Prevent comments from changing config or rules"
+        },
+        {
+            option: "report-unused-disable-directives",
+            type: "Boolean",
+            default: void 0,
+            description: "Adds reported errors for unused eslint-disable directives"
+        },
+        {
+            heading: "Caching"
+        },
+        {
+            option: "cache",
+            type: "Boolean",
+            default: "false",
+            description: "Only check changed files"
+        },
+        {
+            option: "cache-file",
+            type: "path::String",
+            default: ".eslintcache",
+            description: "Path to the cache file. Deprecated: use --cache-location"
+        },
+        {
+            option: "cache-location",
+            type: "path::String",
+            description: "Path to the cache file or directory"
+        },
+        {
+            option: "cache-strategy",
+            dependsOn: ["cache"],
+            type: "String",
+            default: "metadata",
+            enum: ["metadata", "content"],
+            description: "Strategy to use for detecting changed files in the cache"
+        },
+        {
+            heading: "Miscellaneous"
+        },
+        {
+            option: "init",
+            type: "Boolean",
+            default: "false",
+            description: "Run config initialization wizard"
+        },
+        {
+            option: "env-info",
+            type: "Boolean",
+            default: "false",
+            description: "Output execution environment information"
+        },
+        {
+            option: "error-on-unmatched-pattern",
+            type: "Boolean",
+            default: "true",
+            description: "Prevent errors when pattern is unmatched"
+        },
+        {
+            option: "exit-on-fatal-error",
+            type: "Boolean",
+            default: "false",
+            description: "Exit with exit code 2 in case of fatal error"
+        },
+        {
+            option: "debug",
+            type: "Boolean",
+            default: false,
+            description: "Output debugging information"
+        },
+        {
+            option: "help",
+            alias: "h",
+            type: "Boolean",
+            description: "Show help"
+        },
+        {
+            option: "version",
+            alias: "v",
+            type: "Boolean",
+            description: "Output the version number"
+        },
+        {
+            option: "print-config",
+            type: "path::String",
+            description: "Print the configuration for the given file"
+        }
+    ]
+});

node_modules/eslint/lib/rule-tester/index.js

@@ -0,0 +1,5 @@
+"use strict";
+
+module.exports = {
+    RuleTester: require("./rule-tester")
+};

node_modules/eslint/lib/rule-tester/rule-tester.js

@@ -0,0 +1,969 @@
+/**
+ * @fileoverview Mocha test wrapper
+ * @author Ilya Volodin
+ */
+"use strict";
+
+/* global describe, it */
+
+/*
+ * This is a wrapper around mocha to allow for DRY unittests for eslint
+ * Format:
+ * RuleTester.run("{ruleName}", {
+ *      valid: [
+ *          "{code}",
+ *          { code: "{code}", options: {options}, globals: {globals}, parser: "{parser}", settings: {settings} }
+ *      ],
+ *      invalid: [
+ *          { code: "{code}", errors: {numErrors} },
+ *          { code: "{code}", errors: ["{errorMessage}"] },
+ *          { code: "{code}", options: {options}, globals: {globals}, parser: "{parser}", settings: {settings}, errors: [{ message: "{errorMessage}", type: "{errorNodeType}"}] }
+ *      ]
+ *  });
+ *
+ * Variables:
+ * {code} - String that represents the code to be tested
+ * {options} - Arguments that are passed to the configurable rules.
+ * {globals} - An object representing a list of variables that are
+ *             registered as globals
+ * {parser} - String representing the parser to use
+ * {settings} - An object representing global settings for all rules
+ * {numErrors} - If failing case doesn't need to check error message,
+ *               this integer will specify how many errors should be
+ *               received
+ * {errorMessage} - Message that is returned by the rule on failure
+ * {errorNodeType} - AST node type that is returned by they rule as
+ *                   a cause of the failure.
+ */
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const
+    assert = require("assert"),
+    path = require("path"),
+    util = require("util"),
+    merge = require("lodash.merge"),
+    equal = require("fast-deep-equal"),
+    Traverser = require("../../lib/shared/traverser"),
+    { getRuleOptionsSchema, validate } = require("../shared/config-validator"),
+    { Linter, SourceCodeFixer, interpolate } = require("../linter");
+
+const ajv = require("../shared/ajv")({ strictDefaults: true });
+
+const espreePath = require.resolve("espree");
+const parserSymbol = Symbol.for("eslint.RuleTester.parser");
+
+//------------------------------------------------------------------------------
+// Typedefs
+//------------------------------------------------------------------------------
+
+/** @typedef {import("../shared/types").Parser} Parser */
+
+/**
+ * A test case that is expected to pass lint.
+ * @typedef {Object} ValidTestCase
+ * @property {string} code Code for the test case.
+ * @property {any[]} [options] Options for the test case.
+ * @property {{ [name: string]: any }} [settings] Settings for the test case.
+ * @property {string} [filename] The fake filename for the test case. Useful for rules that make assertion about filenames.
+ * @property {string} [parser] The absolute path for the parser.
+ * @property {{ [name: string]: any }} [parserOptions] Options for the parser.
+ * @property {{ [name: string]: "readonly" | "writable" | "off" }} [globals] The additional global variables.
+ * @property {{ [name: string]: boolean }} [env] Environments for the test case.
+ * @property {boolean} [only] Run only this test case or the subset of test cases with this property.
+ */
+
+/**
+ * A test case that is expected to fail lint.
+ * @typedef {Object} InvalidTestCase
+ * @property {string} code Code for the test case.
+ * @property {number | Array<TestCaseError | string | RegExp>} errors Expected errors.
+ * @property {string | null} [output] The expected code after autofixes are applied. If set to `null`, the test runner will assert that no autofix is suggested.
+ * @property {any[]} [options] Options for the test case.
+ * @property {{ [name: string]: any }} [settings] Settings for the test case.
+ * @property {string} [filename] The fake filename for the test case. Useful for rules that make assertion about filenames.
+ * @property {string} [parser] The absolute path for the parser.
+ * @property {{ [name: string]: any }} [parserOptions] Options for the parser.
+ * @property {{ [name: string]: "readonly" | "writable" | "off" }} [globals] The additional global variables.
+ * @property {{ [name: string]: boolean }} [env] Environments for the test case.
+ * @property {boolean} [only] Run only this test case or the subset of test cases with this property.
+ */
+
+/**
+ * A description of a reported error used in a rule tester test.
+ * @typedef {Object} TestCaseError
+ * @property {string | RegExp} [message] Message.
+ * @property {string} [messageId] Message ID.
+ * @property {string} [type] The type of the reported AST node.
+ * @property {{ [name: string]: string }} [data] The data used to fill the message template.
+ * @property {number} [line] The 1-based line number of the reported start location.
+ * @property {number} [column] The 1-based column number of the reported start location.
+ * @property {number} [endLine] The 1-based line number of the reported end location.
+ * @property {number} [endColumn] The 1-based column number of the reported end location.
+ */
+
+//------------------------------------------------------------------------------
+// Private Members
+//------------------------------------------------------------------------------
+
+/*
+ * testerDefaultConfig must not be modified as it allows to reset the tester to
+ * the initial default configuration
+ */
+const testerDefaultConfig = { rules: {} };
+let defaultConfig = { rules: {} };
+
+/*
+ * List every parameters possible on a test case that are not related to eslint
+ * configuration
+ */
+const RuleTesterParameters = [
+    "code",
+    "filename",
+    "options",
+    "errors",
+    "output",
+    "only"
+];
+
+/*
+ * All allowed property names in error objects.
+ */
+const errorObjectParameters = new Set([
+    "message",
+    "messageId",
+    "data",
+    "type",
+    "line",
+    "column",
+    "endLine",
+    "endColumn",
+    "suggestions"
+]);
+const friendlyErrorObjectParameterList = `[${[...errorObjectParameters].map(key => `'${key}'`).join(", ")}]`;
+
+/*
+ * All allowed property names in suggestion objects.
+ */
+const suggestionObjectParameters = new Set([
+    "desc",
+    "messageId",
+    "data",
+    "output"
+]);
+const friendlySuggestionObjectParameterList = `[${[...suggestionObjectParameters].map(key => `'${key}'`).join(", ")}]`;
+
+const hasOwnProperty = Function.call.bind(Object.hasOwnProperty);
+
+/**
+ * Clones a given value deeply.
+ * Note: This ignores `parent` property.
+ * @param {any} x A value to clone.
+ * @returns {any} A cloned value.
+ */
+function cloneDeeplyExcludesParent(x) {
+    if (typeof x === "object" && x !== null) {
+        if (Array.isArray(x)) {
+            return x.map(cloneDeeplyExcludesParent);
+        }
+
+        const retv = {};
+
+        for (const key in x) {
+            if (key !== "parent" && hasOwnProperty(x, key)) {
+                retv[key] = cloneDeeplyExcludesParent(x[key]);
+            }
+        }
+
+        return retv;
+    }
+
+    return x;
+}
+
+/**
+ * Freezes a given value deeply.
+ * @param {any} x A value to freeze.
+ * @returns {void}
+ */
+function freezeDeeply(x) {
+    if (typeof x === "object" && x !== null) {
+        if (Array.isArray(x)) {
+            x.forEach(freezeDeeply);
+        } else {
+            for (const key in x) {
+                if (key !== "parent" && hasOwnProperty(x, key)) {
+                    freezeDeeply(x[key]);
+                }
+            }
+        }
+        Object.freeze(x);
+    }
+}
+
+/**
+ * Replace control characters by `\u00xx` form.
+ * @param {string} text The text to sanitize.
+ * @returns {string} The sanitized text.
+ */
+function sanitize(text) {
+    return text.replace(
+        /[\u0000-\u0009\u000b-\u001a]/gu, // eslint-disable-line no-control-regex
+        c => `\\u${c.codePointAt(0).toString(16).padStart(4, "0")}`
+    );
+}
+
+/**
+ * Define `start`/`end` properties as throwing error.
+ * @param {string} objName Object name used for error messages.
+ * @param {ASTNode} node The node to define.
+ * @returns {void}
+ */
+function defineStartEndAsError(objName, node) {
+    Object.defineProperties(node, {
+        start: {
+            get() {
+                throw new Error(`Use ${objName}.range[0] instead of ${objName}.start`);
+            },
+            configurable: true,
+            enumerable: false
+        },
+        end: {
+            get() {
+                throw new Error(`Use ${objName}.range[1] instead of ${objName}.end`);
+            },
+            configurable: true,
+            enumerable: false
+        }
+    });
+}
+
+
+/**
+ * Define `start`/`end` properties of all nodes of the given AST as throwing error.
+ * @param {ASTNode} ast The root node to errorize `start`/`end` properties.
+ * @param {Object} [visitorKeys] Visitor keys to be used for traversing the given ast.
+ * @returns {void}
+ */
+function defineStartEndAsErrorInTree(ast, visitorKeys) {
+    Traverser.traverse(ast, { visitorKeys, enter: defineStartEndAsError.bind(null, "node") });
+    ast.tokens.forEach(defineStartEndAsError.bind(null, "token"));
+    ast.comments.forEach(defineStartEndAsError.bind(null, "token"));
+}
+
+/**
+ * Wraps the given parser in order to intercept and modify return values from the `parse` and `parseForESLint` methods, for test purposes.
+ * In particular, to modify ast nodes, tokens and comments to throw on access to their `start` and `end` properties.
+ * @param {Parser} parser Parser object.
+ * @returns {Parser} Wrapped parser object.
+ */
+function wrapParser(parser) {
+
+    if (typeof parser.parseForESLint === "function") {
+        return {
+            [parserSymbol]: parser,
+            parseForESLint(...args) {
+                const ret = parser.parseForESLint(...args);
+
+                defineStartEndAsErrorInTree(ret.ast, ret.visitorKeys);
+                return ret;
+            }
+        };
+    }
+
+    return {
+        [parserSymbol]: parser,
+        parse(...args) {
+            const ast = parser.parse(...args);
+
+            defineStartEndAsErrorInTree(ast);
+            return ast;
+        }
+    };
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+// default separators for testing
+const DESCRIBE = Symbol("describe");
+const IT = Symbol("it");
+const IT_ONLY = Symbol("itOnly");
+
+/**
+ * This is `it` default handler if `it` don't exist.
+ * @this {Mocha}
+ * @param {string} text The description of the test case.
+ * @param {Function} method The logic of the test case.
+ * @returns {any} Returned value of `method`.
+ */
+function itDefaultHandler(text, method) {
+    try {
+        return method.call(this);
+    } catch (err) {
+        if (err instanceof assert.AssertionError) {
+            err.message += ` (${util.inspect(err.actual)} ${err.operator} ${util.inspect(err.expected)})`;
+        }
+        throw err;
+    }
+}
+
+/**
+ * This is `describe` default handler if `describe` don't exist.
+ * @this {Mocha}
+ * @param {string} text The description of the test case.
+ * @param {Function} method The logic of the test case.
+ * @returns {any} Returned value of `method`.
+ */
+function describeDefaultHandler(text, method) {
+    return method.call(this);
+}
+
+class RuleTester {
+
+    /**
+     * Creates a new instance of RuleTester.
+     * @param {Object} [testerConfig] Optional, extra configuration for the tester
+     */
+    constructor(testerConfig) {
+
+        /**
+         * The configuration to use for this tester. Combination of the tester
+         * configuration and the default configuration.
+         * @type {Object}
+         */
+        this.testerConfig = merge(
+            {},
+            defaultConfig,
+            testerConfig,
+            { rules: { "rule-tester/validate-ast": "error" } }
+        );
+
+        /**
+         * Rule definitions to define before tests.
+         * @type {Object}
+         */
+        this.rules = {};
+        this.linter = new Linter();
+    }
+
+    /**
+     * Set the configuration to use for all future tests
+     * @param {Object} config the configuration to use.
+     * @returns {void}
+     */
+    static setDefaultConfig(config) {
+        if (typeof config !== "object") {
+            throw new TypeError("RuleTester.setDefaultConfig: config must be an object");
+        }
+        defaultConfig = config;
+
+        // Make sure the rules object exists since it is assumed to exist later
+        defaultConfig.rules = defaultConfig.rules || {};
+    }
+
+    /**
+     * Get the current configuration used for all tests
+     * @returns {Object} the current configuration
+     */
+    static getDefaultConfig() {
+        return defaultConfig;
+    }
+
+    /**
+     * Reset the configuration to the initial configuration of the tester removing
+     * any changes made until now.
+     * @returns {void}
+     */
+    static resetDefaultConfig() {
+        defaultConfig = merge({}, testerDefaultConfig);
+    }
+
+
+    /*
+     * If people use `mocha test.js --watch` command, `describe` and `it` function
+     * instances are different for each execution. So `describe` and `it` should get fresh instance
+     * always.
+     */
+    static get describe() {
+        return (
+            this[DESCRIBE] ||
+            (typeof describe === "function" ? describe : describeDefaultHandler)
+        );
+    }
+
+    static set describe(value) {
+        this[DESCRIBE] = value;
+    }
+
+    static get it() {
+        return (
+            this[IT] ||
+            (typeof it === "function" ? it : itDefaultHandler)
+        );
+    }
+
+    static set it(value) {
+        this[IT] = value;
+    }
+
+    /**
+     * Adds the `only` property to a test to run it in isolation.
+     * @param {string | ValidTestCase | InvalidTestCase} item A single test to run by itself.
+     * @returns {ValidTestCase | InvalidTestCase} The test with `only` set.
+     */
+    static only(item) {
+        if (typeof item === "string") {
+            return { code: item, only: true };
+        }
+
+        return { ...item, only: true };
+    }
+
+    static get itOnly() {
+        if (typeof this[IT_ONLY] === "function") {
+            return this[IT_ONLY];
+        }
+        if (typeof this[IT] === "function" && typeof this[IT].only === "function") {
+            return Function.bind.call(this[IT].only, this[IT]);
+        }
+        if (typeof it === "function" && typeof it.only === "function") {
+            return Function.bind.call(it.only, it);
+        }
+
+        if (typeof this[DESCRIBE] === "function" || typeof this[IT] === "function") {
+            throw new Error(
+                "Set `RuleTester.itOnly` to use `only` with a custom test framework.\n" +
+                "See https://eslint.org/docs/developer-guide/nodejs-api#customizing-ruletester for more."
+            );
+        }
+        if (typeof it === "function") {
+            throw new Error("The current test framework does not support exclusive tests with `only`.");
+        }
+        throw new Error("To use `only`, use RuleTester with a test framework that provides `it.only()` like Mocha.");
+    }
+
+    static set itOnly(value) {
+        this[IT_ONLY] = value;
+    }
+
+    /**
+     * Define a rule for one particular run of tests.
+     * @param {string} name The name of the rule to define.
+     * @param {Function} rule The rule definition.
+     * @returns {void}
+     */
+    defineRule(name, rule) {
+        this.rules[name] = rule;
+    }
+
+    /**
+     * Adds a new rule test to execute.
+     * @param {string} ruleName The name of the rule to run.
+     * @param {Function} rule The rule to test.
+     * @param {{
+     *   valid: (ValidTestCase | string)[],
+     *   invalid: InvalidTestCase[]
+     * }} test The collection of tests to run.
+     * @returns {void}
+     */
+    run(ruleName, rule, test) {
+
+        const testerConfig = this.testerConfig,
+            requiredScenarios = ["valid", "invalid"],
+            scenarioErrors = [],
+            linter = this.linter;
+
+        if (!test || typeof test !== "object") {
+            throw new TypeError(`Test Scenarios for rule ${ruleName} : Could not find test scenario object`);
+        }
+
+        requiredScenarios.forEach(scenarioType => {
+            if (!test[scenarioType]) {
+                scenarioErrors.push(`Could not find any ${scenarioType} test scenarios`);
+            }
+        });
+
+        if (scenarioErrors.length > 0) {
+            throw new Error([
+                `Test Scenarios for rule ${ruleName} is invalid:`
+            ].concat(scenarioErrors).join("\n"));
+        }
+
+
+        linter.defineRule(ruleName, Object.assign({}, rule, {
+
+            // Create a wrapper rule that freezes the `context` properties.
+            create(context) {
+                freezeDeeply(context.options);
+                freezeDeeply(context.settings);
+                freezeDeeply(context.parserOptions);
+
+                return (typeof rule === "function" ? rule : rule.create)(context);
+            }
+        }));
+
+        linter.defineRules(this.rules);
+
+        /**
+         * Run the rule for the given item
+         * @param {string|Object} item Item to run the rule against
+         * @returns {Object} Eslint run result
+         * @private
+         */
+        function runRuleForItem(item) {
+            let config = merge({}, testerConfig),
+                code, filename, output, beforeAST, afterAST;
+
+            if (typeof item === "string") {
+                code = item;
+            } else {
+                code = item.code;
+
+                /*
+                 * Assumes everything on the item is a config except for the
+                 * parameters used by this tester
+                 */
+                const itemConfig = { ...item };
+
+                for (const parameter of RuleTesterParameters) {
+                    delete itemConfig[parameter];
+                }
+
+                /*
+                 * Create the config object from the tester config and this item
+                 * specific configurations.
+                 */
+                config = merge(
+                    config,
+                    itemConfig
+                );
+            }
+
+            if (item.filename) {
+                filename = item.filename;
+            }
+
+            if (hasOwnProperty(item, "options")) {
+                assert(Array.isArray(item.options), "options must be an array");
+                config.rules[ruleName] = [1].concat(item.options);
+            } else {
+                config.rules[ruleName] = 1;
+            }
+
+            const schema = getRuleOptionsSchema(rule);
+
+            /*
+             * Setup AST getters.
+             * The goal is to check whether or not AST was modified when
+             * running the rule under test.
+             */
+            linter.defineRule("rule-tester/validate-ast", () => ({
+                Program(node) {
+                    beforeAST = cloneDeeplyExcludesParent(node);
+                },
+                "Program:exit"(node) {
+                    afterAST = node;
+                }
+            }));
+
+            if (typeof config.parser === "string") {
+                assert(path.isAbsolute(config.parser), "Parsers provided as strings to RuleTester must be absolute paths");
+            } else {
+                config.parser = espreePath;
+            }
+
+            linter.defineParser(config.parser, wrapParser(require(config.parser)));
+
+            if (schema) {
+                ajv.validateSchema(schema);
+
+                if (ajv.errors) {
+                    const errors = ajv.errors.map(error => {
+                        const field = error.dataPath[0] === "." ? error.dataPath.slice(1) : error.dataPath;
+
+                        return `\t${field}: ${error.message}`;
+                    }).join("\n");
+
+                    throw new Error([`Schema for rule ${ruleName} is invalid:`, errors]);
+                }
+
+                /*
+                 * `ajv.validateSchema` checks for errors in the structure of the schema (by comparing the schema against a "meta-schema"),
+                 * and it reports those errors individually. However, there are other types of schema errors that only occur when compiling
+                 * the schema (e.g. using invalid defaults in a schema), and only one of these errors can be reported at a time. As a result,
+                 * the schema is compiled here separately from checking for `validateSchema` errors.
+                 */
+                try {
+                    ajv.compile(schema);
+                } catch (err) {
+                    throw new Error(`Schema for rule ${ruleName} is invalid: ${err.message}`);
+                }
+            }
+
+            validate(config, "rule-tester", id => (id === ruleName ? rule : null));
+
+            // Verify the code.
+            const messages = linter.verify(code, config, filename);
+            const fatalErrorMessage = messages.find(m => m.fatal);
+
+            assert(!fatalErrorMessage, `A fatal parsing error occurred: ${fatalErrorMessage && fatalErrorMessage.message}`);
+
+            // Verify if autofix makes a syntax error or not.
+            if (messages.some(m => m.fix)) {
+                output = SourceCodeFixer.applyFixes(code, messages).output;
+                const errorMessageInFix = linter.verify(output, config, filename).find(m => m.fatal);
+
+                assert(!errorMessageInFix, [
+                    "A fatal parsing error occurred in autofix.",
+                    `Error: ${errorMessageInFix && errorMessageInFix.message}`,
+                    "Autofix output:",
+                    output
+                ].join("\n"));
+            } else {
+                output = code;
+            }
+
+            return {
+                messages,
+                output,
+                beforeAST,
+                afterAST: cloneDeeplyExcludesParent(afterAST)
+            };
+        }
+
+        /**
+         * Check if the AST was changed
+         * @param {ASTNode} beforeAST AST node before running
+         * @param {ASTNode} afterAST AST node after running
+         * @returns {void}
+         * @private
+         */
+        function assertASTDidntChange(beforeAST, afterAST) {
+            if (!equal(beforeAST, afterAST)) {
+                assert.fail("Rule should not modify AST.");
+            }
+        }
+
+        /**
+         * Check if the template is valid or not
+         * all valid cases go through this
+         * @param {string|Object} item Item to run the rule against
+         * @returns {void}
+         * @private
+         */
+        function testValidTemplate(item) {
+            const result = runRuleForItem(item);
+            const messages = result.messages;
+
+            assert.strictEqual(messages.length, 0, util.format("Should have no errors but had %d: %s",
+                messages.length,
+                util.inspect(messages)));
+
+            assertASTDidntChange(result.beforeAST, result.afterAST);
+        }
+
+        /**
+         * Asserts that the message matches its expected value. If the expected
+         * value is a regular expression, it is checked against the actual
+         * value.
+         * @param {string} actual Actual value
+         * @param {string|RegExp} expected Expected value
+         * @returns {void}
+         * @private
+         */
+        function assertMessageMatches(actual, expected) {
+            if (expected instanceof RegExp) {
+
+                // assert.js doesn't have a built-in RegExp match function
+                assert.ok(
+                    expected.test(actual),
+                    `Expected '${actual}' to match ${expected}`
+                );
+            } else {
+                assert.strictEqual(actual, expected);
+            }
+        }
+
+        /**
+         * Check if the template is invalid or not
+         * all invalid cases go through this.
+         * @param {string|Object} item Item to run the rule against
+         * @returns {void}
+         * @private
+         */
+        function testInvalidTemplate(item) {
+            assert.ok(item.errors || item.errors === 0,
+                `Did not specify errors for an invalid test of ${ruleName}`);
+
+            if (Array.isArray(item.errors) && item.errors.length === 0) {
+                assert.fail("Invalid cases must have at least one error");
+            }
+
+            const ruleHasMetaMessages = hasOwnProperty(rule, "meta") && hasOwnProperty(rule.meta, "messages");
+            const friendlyIDList = ruleHasMetaMessages ? `[${Object.keys(rule.meta.messages).map(key => `'${key}'`).join(", ")}]` : null;
+
+            const result = runRuleForItem(item);
+            const messages = result.messages;
+
+            if (typeof item.errors === "number") {
+
+                if (item.errors === 0) {
+                    assert.fail("Invalid cases must have 'error' value greater than 0");
+                }
+
+                assert.strictEqual(messages.length, item.errors, util.format("Should have %d error%s but had %d: %s",
+                    item.errors,
+                    item.errors === 1 ? "" : "s",
+                    messages.length,
+                    util.inspect(messages)));
+            } else {
+                assert.strictEqual(
+                    messages.length, item.errors.length, util.format(
+                        "Should have %d error%s but had %d: %s",
+                        item.errors.length,
+                        item.errors.length === 1 ? "" : "s",
+                        messages.length,
+                        util.inspect(messages)
+                    )
+                );
+
+                const hasMessageOfThisRule = messages.some(m => m.ruleId === ruleName);
+
+                for (let i = 0, l = item.errors.length; i < l; i++) {
+                    const error = item.errors[i];
+                    const message = messages[i];
+
+                    assert(hasMessageOfThisRule, "Error rule name should be the same as the name of the rule being tested");
+
+                    if (typeof error === "string" || error instanceof RegExp) {
+
+                        // Just an error message.
+                        assertMessageMatches(message.message, error);
+                    } else if (typeof error === "object" && error !== null) {
+
+                        /*
+                         * Error object.
+                         * This may have a message, messageId, data, node type, line, and/or
+                         * column.
+                         */
+
+                        Object.keys(error).forEach(propertyName => {
+                            assert.ok(
+                                errorObjectParameters.has(propertyName),
+                                `Invalid error property name '${propertyName}'. Expected one of ${friendlyErrorObjectParameterList}.`
+                            );
+                        });
+
+                        if (hasOwnProperty(error, "message")) {
+                            assert.ok(!hasOwnProperty(error, "messageId"), "Error should not specify both 'message' and a 'messageId'.");
+                            assert.ok(!hasOwnProperty(error, "data"), "Error should not specify both 'data' and 'message'.");
+                            assertMessageMatches(message.message, error.message);
+                        } else if (hasOwnProperty(error, "messageId")) {
+                            assert.ok(
+                                ruleHasMetaMessages,
+                                "Error can not use 'messageId' if rule under test doesn't define 'meta.messages'."
+                            );
+                            if (!hasOwnProperty(rule.meta.messages, error.messageId)) {
+                                assert(false, `Invalid messageId '${error.messageId}'. Expected one of ${friendlyIDList}.`);
+                            }
+                            assert.strictEqual(
+                                message.messageId,
+                                error.messageId,
+                                `messageId '${message.messageId}' does not match expected messageId '${error.messageId}'.`
+                            );
+                            if (hasOwnProperty(error, "data")) {
+
+                                /*
+                                 *  if data was provided, then directly compare the returned message to a synthetic
+                                 *  interpolated message using the same message ID and data provided in the test.
+                                 *  See https://github.com/eslint/eslint/issues/9890 for context.
+                                 */
+                                const unformattedOriginalMessage = rule.meta.messages[error.messageId];
+                                const rehydratedMessage = interpolate(unformattedOriginalMessage, error.data);
+
+                                assert.strictEqual(
+                                    message.message,
+                                    rehydratedMessage,
+                                    `Hydrated message "${rehydratedMessage}" does not match "${message.message}"`
+                                );
+                            }
+                        }
+
+                        assert.ok(
+                            hasOwnProperty(error, "data") ? hasOwnProperty(error, "messageId") : true,
+                            "Error must specify 'messageId' if 'data' is used."
+                        );
+
+                        if (error.type) {
+                            assert.strictEqual(message.nodeType, error.type, `Error type should be ${error.type}, found ${message.nodeType}`);
+                        }
+
+                        if (hasOwnProperty(error, "line")) {
+                            assert.strictEqual(message.line, error.line, `Error line should be ${error.line}`);
+                        }
+
+                        if (hasOwnProperty(error, "column")) {
+                            assert.strictEqual(message.column, error.column, `Error column should be ${error.column}`);
+                        }
+
+                        if (hasOwnProperty(error, "endLine")) {
+                            assert.strictEqual(message.endLine, error.endLine, `Error endLine should be ${error.endLine}`);
+                        }
+
+                        if (hasOwnProperty(error, "endColumn")) {
+                            assert.strictEqual(message.endColumn, error.endColumn, `Error endColumn should be ${error.endColumn}`);
+                        }
+
+                        if (hasOwnProperty(error, "suggestions")) {
+
+                            // Support asserting there are no suggestions
+                            if (!error.suggestions || (Array.isArray(error.suggestions) && error.suggestions.length === 0)) {
+                                if (Array.isArray(message.suggestions) && message.suggestions.length > 0) {
+                                    assert.fail(`Error should have no suggestions on error with message: "${message.message}"`);
+                                }
+                            } else {
+                                assert.strictEqual(Array.isArray(message.suggestions), true, `Error should have an array of suggestions. Instead received "${message.suggestions}" on error with message: "${message.message}"`);
+                                assert.strictEqual(message.suggestions.length, error.suggestions.length, `Error should have ${error.suggestions.length} suggestions. Instead found ${message.suggestions.length} suggestions`);
+
+                                error.suggestions.forEach((expectedSuggestion, index) => {
+                                    assert.ok(
+                                        typeof expectedSuggestion === "object" && expectedSuggestion !== null,
+                                        "Test suggestion in 'suggestions' array must be an object."
+                                    );
+                                    Object.keys(expectedSuggestion).forEach(propertyName => {
+                                        assert.ok(
+                                            suggestionObjectParameters.has(propertyName),
+                                            `Invalid suggestion property name '${propertyName}'. Expected one of ${friendlySuggestionObjectParameterList}.`
+                                        );
+                                    });
+
+                                    const actualSuggestion = message.suggestions[index];
+                                    const suggestionPrefix = `Error Suggestion at index ${index} :`;
+
+                                    if (hasOwnProperty(expectedSuggestion, "desc")) {
+                                        assert.ok(
+                                            !hasOwnProperty(expectedSuggestion, "data"),
+                                            `${suggestionPrefix} Test should not specify both 'desc' and 'data'.`
+                                        );
+                                        assert.strictEqual(
+                                            actualSuggestion.desc,
+                                            expectedSuggestion.desc,
+                                            `${suggestionPrefix} desc should be "${expectedSuggestion.desc}" but got "${actualSuggestion.desc}" instead.`
+                                        );
+                                    }
+
+                                    if (hasOwnProperty(expectedSuggestion, "messageId")) {
+                                        assert.ok(
+                                            ruleHasMetaMessages,
+                                            `${suggestionPrefix} Test can not use 'messageId' if rule under test doesn't define 'meta.messages'.`
+                                        );
+                                        assert.ok(
+                                            hasOwnProperty(rule.meta.messages, expectedSuggestion.messageId),
+                                            `${suggestionPrefix} Test has invalid messageId '${expectedSuggestion.messageId}', the rule under test allows only one of ${friendlyIDList}.`
+                                        );
+                                        assert.strictEqual(
+                                            actualSuggestion.messageId,
+                                            expectedSuggestion.messageId,
+                                            `${suggestionPrefix} messageId should be '${expectedSuggestion.messageId}' but got '${actualSuggestion.messageId}' instead.`
+                                        );
+                                        if (hasOwnProperty(expectedSuggestion, "data")) {
+                                            const unformattedMetaMessage = rule.meta.messages[expectedSuggestion.messageId];
+                                            const rehydratedDesc = interpolate(unformattedMetaMessage, expectedSuggestion.data);
+
+                                            assert.strictEqual(
+                                                actualSuggestion.desc,
+                                                rehydratedDesc,
+                                                `${suggestionPrefix} Hydrated test desc "${rehydratedDesc}" does not match received desc "${actualSuggestion.desc}".`
+                                            );
+                                        }
+                                    } else {
+                                        assert.ok(
+                                            !hasOwnProperty(expectedSuggestion, "data"),
+                                            `${suggestionPrefix} Test must specify 'messageId' if 'data' is used.`
+                                        );
+                                    }
+
+                                    if (hasOwnProperty(expectedSuggestion, "output")) {
+                                        const codeWithAppliedSuggestion = SourceCodeFixer.applyFixes(item.code, [actualSuggestion]).output;
+
+                                        assert.strictEqual(codeWithAppliedSuggestion, expectedSuggestion.output, `Expected the applied suggestion fix to match the test suggestion output for suggestion at index: ${index} on error with message: "${message.message}"`);
+                                    }
+                                });
+                            }
+                        }
+                    } else {
+
+                        // Message was an unexpected type
+                        assert.fail(`Error should be a string, object, or RegExp, but found (${util.inspect(message)})`);
+                    }
+                }
+            }
+
+            if (hasOwnProperty(item, "output")) {
+                if (item.output === null) {
+                    assert.strictEqual(
+                        result.output,
+                        item.code,
+                        "Expected no autofixes to be suggested"
+                    );
+                } else {
+                    assert.strictEqual(result.output, item.output, "Output is incorrect.");
+                }
+            } else {
+                assert.strictEqual(
+                    result.output,
+                    item.code,
+                    "The rule fixed the code. Please add 'output' property."
+                );
+            }
+
+            // Rules that produce fixes must have `meta.fixable` property.
+            if (result.output !== item.code) {
+                assert.ok(
+                    hasOwnProperty(rule, "meta"),
+                    "Fixable rules should export a `meta.fixable` property."
+                );
+
+                // Linter throws if a rule that produced a fix has `meta` but doesn't have `meta.fixable`.
+            }
+
+            assertASTDidntChange(result.beforeAST, result.afterAST);
+        }
+
+        /*
+         * This creates a mocha test suite and pipes all supplied info through
+         * one of the templates above.
+         */
+        RuleTester.describe(ruleName, () => {
+            RuleTester.describe("valid", () => {
+                test.valid.forEach(valid => {
+                    RuleTester[valid.only ? "itOnly" : "it"](
+                        sanitize(typeof valid === "object" ? valid.code : valid),
+                        () => {
+                            testValidTemplate(valid);
+                        }
+                    );
+                });
+            });
+
+            RuleTester.describe("invalid", () => {
+                test.invalid.forEach(invalid => {
+                    RuleTester[invalid.only ? "itOnly" : "it"](
+                        sanitize(invalid.code),
+                        () => {
+                            testInvalidTemplate(invalid);
+                        }
+                    );
+                });
+            });
+        });
+    }
+}
+
+RuleTester[DESCRIBE] = RuleTester[IT] = RuleTester[IT_ONLY] = null;
+
+module.exports = RuleTester;

node_modules/eslint/lib/rules/accessor-pairs.js

@@ -0,0 +1,354 @@
+/**
+ * @fileoverview Rule to enforce getter and setter pairs in objects and classes.
+ * @author Gyandeep Singh
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Typedefs
+//------------------------------------------------------------------------------
+
+/**
+ * Property name if it can be computed statically, otherwise the list of the tokens of the key node.
+ * @typedef {string|Token[]} Key
+ */
+
+/**
+ * Accessor nodes with the same key.
+ * @typedef {Object} AccessorData
+ * @property {Key} key Accessor's key
+ * @property {ASTNode[]} getters List of getter nodes.
+ * @property {ASTNode[]} setters List of setter nodes.
+ */
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Checks whether or not the given lists represent the equal tokens in the same order.
+ * Tokens are compared by their properties, not by instance.
+ * @param {Token[]} left First list of tokens.
+ * @param {Token[]} right Second list of tokens.
+ * @returns {boolean} `true` if the lists have same tokens.
+ */
+function areEqualTokenLists(left, right) {
+    if (left.length !== right.length) {
+        return false;
+    }
+
+    for (let i = 0; i < left.length; i++) {
+        const leftToken = left[i],
+            rightToken = right[i];
+
+        if (leftToken.type !== rightToken.type || leftToken.value !== rightToken.value) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+/**
+ * Checks whether or not the given keys are equal.
+ * @param {Key} left First key.
+ * @param {Key} right Second key.
+ * @returns {boolean} `true` if the keys are equal.
+ */
+function areEqualKeys(left, right) {
+    if (typeof left === "string" && typeof right === "string") {
+
+        // Statically computed names.
+        return left === right;
+    }
+    if (Array.isArray(left) && Array.isArray(right)) {
+
+        // Token lists.
+        return areEqualTokenLists(left, right);
+    }
+
+    return false;
+}
+
+/**
+ * Checks whether or not a given node is of an accessor kind ('get' or 'set').
+ * @param {ASTNode} node A node to check.
+ * @returns {boolean} `true` if the node is of an accessor kind.
+ */
+function isAccessorKind(node) {
+    return node.kind === "get" || node.kind === "set";
+}
+
+/**
+ * Checks whether or not a given node is an argument of a specified method call.
+ * @param {ASTNode} node A node to check.
+ * @param {number} index An expected index of the node in arguments.
+ * @param {string} object An expected name of the object of the method.
+ * @param {string} property An expected name of the method.
+ * @returns {boolean} `true` if the node is an argument of the specified method call.
+ */
+function isArgumentOfMethodCall(node, index, object, property) {
+    const parent = node.parent;
+
+    return (
+        parent.type === "CallExpression" &&
+        astUtils.isSpecificMemberAccess(parent.callee, object, property) &&
+        parent.arguments[index] === node
+    );
+}
+
+/**
+ * Checks whether or not a given node is a property descriptor.
+ * @param {ASTNode} node A node to check.
+ * @returns {boolean} `true` if the node is a property descriptor.
+ */
+function isPropertyDescriptor(node) {
+
+    // Object.defineProperty(obj, "foo", {set: ...})
+    if (isArgumentOfMethodCall(node, 2, "Object", "defineProperty") ||
+        isArgumentOfMethodCall(node, 2, "Reflect", "defineProperty")
+    ) {
+        return true;
+    }
+
+    /*
+     * Object.defineProperties(obj, {foo: {set: ...}})
+     * Object.create(proto, {foo: {set: ...}})
+     */
+    const grandparent = node.parent.parent;
+
+    return grandparent.type === "ObjectExpression" && (
+        isArgumentOfMethodCall(grandparent, 1, "Object", "create") ||
+        isArgumentOfMethodCall(grandparent, 1, "Object", "defineProperties")
+    );
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "enforce getter and setter pairs in objects and classes",
+            category: "Best Practices",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/accessor-pairs"
+        },
+
+        schema: [{
+            type: "object",
+            properties: {
+                getWithoutSet: {
+                    type: "boolean",
+                    default: false
+                },
+                setWithoutGet: {
+                    type: "boolean",
+                    default: true
+                },
+                enforceForClassMembers: {
+                    type: "boolean",
+                    default: true
+                }
+            },
+            additionalProperties: false
+        }],
+
+        messages: {
+            missingGetterInPropertyDescriptor: "Getter is not present in property descriptor.",
+            missingSetterInPropertyDescriptor: "Setter is not present in property descriptor.",
+            missingGetterInObjectLiteral: "Getter is not present for {{ name }}.",
+            missingSetterInObjectLiteral: "Setter is not present for {{ name }}.",
+            missingGetterInClass: "Getter is not present for class {{ name }}.",
+            missingSetterInClass: "Setter is not present for class {{ name }}."
+        }
+    },
+    create(context) {
+        const config = context.options[0] || {};
+        const checkGetWithoutSet = config.getWithoutSet === true;
+        const checkSetWithoutGet = config.setWithoutGet !== false;
+        const enforceForClassMembers = config.enforceForClassMembers !== false;
+        const sourceCode = context.getSourceCode();
+
+        /**
+         * Reports the given node.
+         * @param {ASTNode} node The node to report.
+         * @param {string} messageKind "missingGetter" or "missingSetter".
+         * @returns {void}
+         * @private
+         */
+        function report(node, messageKind) {
+            if (node.type === "Property") {
+                context.report({
+                    node,
+                    messageId: `${messageKind}InObjectLiteral`,
+                    loc: astUtils.getFunctionHeadLoc(node.value, sourceCode),
+                    data: { name: astUtils.getFunctionNameWithKind(node.value) }
+                });
+            } else if (node.type === "MethodDefinition") {
+                context.report({
+                    node,
+                    messageId: `${messageKind}InClass`,
+                    loc: astUtils.getFunctionHeadLoc(node.value, sourceCode),
+                    data: { name: astUtils.getFunctionNameWithKind(node.value) }
+                });
+            } else {
+                context.report({
+                    node,
+                    messageId: `${messageKind}InPropertyDescriptor`
+                });
+            }
+        }
+
+        /**
+         * Reports each of the nodes in the given list using the same messageId.
+         * @param {ASTNode[]} nodes Nodes to report.
+         * @param {string} messageKind "missingGetter" or "missingSetter".
+         * @returns {void}
+         * @private
+         */
+        function reportList(nodes, messageKind) {
+            for (const node of nodes) {
+                report(node, messageKind);
+            }
+        }
+
+        /**
+         * Creates a new `AccessorData` object for the given getter or setter node.
+         * @param {ASTNode} node A getter or setter node.
+         * @returns {AccessorData} New `AccessorData` object that contains the given node.
+         * @private
+         */
+        function createAccessorData(node) {
+            const name = astUtils.getStaticPropertyName(node);
+            const key = (name !== null) ? name : sourceCode.getTokens(node.key);
+
+            return {
+                key,
+                getters: node.kind === "get" ? [node] : [],
+                setters: node.kind === "set" ? [node] : []
+            };
+        }
+
+        /**
+         * Merges the given `AccessorData` object into the given accessors list.
+         * @param {AccessorData[]} accessors The list to merge into.
+         * @param {AccessorData} accessorData The object to merge.
+         * @returns {AccessorData[]} The same instance with the merged object.
+         * @private
+         */
+        function mergeAccessorData(accessors, accessorData) {
+            const equalKeyElement = accessors.find(a => areEqualKeys(a.key, accessorData.key));
+
+            if (equalKeyElement) {
+                equalKeyElement.getters.push(...accessorData.getters);
+                equalKeyElement.setters.push(...accessorData.setters);
+            } else {
+                accessors.push(accessorData);
+            }
+
+            return accessors;
+        }
+
+        /**
+         * Checks accessor pairs in the given list of nodes.
+         * @param {ASTNode[]} nodes The list to check.
+         * @returns {void}
+         * @private
+         */
+        function checkList(nodes) {
+            const accessors = nodes
+                .filter(isAccessorKind)
+                .map(createAccessorData)
+                .reduce(mergeAccessorData, []);
+
+            for (const { getters, setters } of accessors) {
+                if (checkSetWithoutGet && setters.length && !getters.length) {
+                    reportList(setters, "missingGetter");
+                }
+                if (checkGetWithoutSet && getters.length && !setters.length) {
+                    reportList(getters, "missingSetter");
+                }
+            }
+        }
+
+        /**
+         * Checks accessor pairs in an object literal.
+         * @param {ASTNode} node `ObjectExpression` node to check.
+         * @returns {void}
+         * @private
+         */
+        function checkObjectLiteral(node) {
+            checkList(node.properties.filter(p => p.type === "Property"));
+        }
+
+        /**
+         * Checks accessor pairs in a property descriptor.
+         * @param {ASTNode} node Property descriptor `ObjectExpression` node to check.
+         * @returns {void}
+         * @private
+         */
+        function checkPropertyDescriptor(node) {
+            const namesToCheck = node.properties
+                .filter(p => p.type === "Property" && p.kind === "init" && !p.computed)
+                .map(({ key }) => key.name);
+
+            const hasGetter = namesToCheck.includes("get");
+            const hasSetter = namesToCheck.includes("set");
+
+            if (checkSetWithoutGet && hasSetter && !hasGetter) {
+                report(node, "missingGetter");
+            }
+            if (checkGetWithoutSet && hasGetter && !hasSetter) {
+                report(node, "missingSetter");
+            }
+        }
+
+        /**
+         * Checks the given object expression as an object literal and as a possible property descriptor.
+         * @param {ASTNode} node `ObjectExpression` node to check.
+         * @returns {void}
+         * @private
+         */
+        function checkObjectExpression(node) {
+            checkObjectLiteral(node);
+            if (isPropertyDescriptor(node)) {
+                checkPropertyDescriptor(node);
+            }
+        }
+
+        /**
+         * Checks the given class body.
+         * @param {ASTNode} node `ClassBody` node to check.
+         * @returns {void}
+         * @private
+         */
+        function checkClassBody(node) {
+            const methodDefinitions = node.body.filter(m => m.type === "MethodDefinition");
+
+            checkList(methodDefinitions.filter(m => m.static));
+            checkList(methodDefinitions.filter(m => !m.static));
+        }
+
+        const listeners = {};
+
+        if (checkSetWithoutGet || checkGetWithoutSet) {
+            listeners.ObjectExpression = checkObjectExpression;
+            if (enforceForClassMembers) {
+                listeners.ClassBody = checkClassBody;
+            }
+        }
+
+        return listeners;
+    }
+};

node_modules/eslint/lib/rules/array-bracket-newline.js

@@ -0,0 +1,258 @@
+/**
+ * @fileoverview Rule to enforce linebreaks after open and before close array brackets
+ * @author Jan Peer Stöcklmair <https://github.com/JPeer264>
+ */
+
+"use strict";
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce linebreaks after opening and before closing array brackets",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/array-bracket-newline"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                oneOf: [
+                    {
+                        enum: ["always", "never", "consistent"]
+                    },
+                    {
+                        type: "object",
+                        properties: {
+                            multiline: {
+                                type: "boolean"
+                            },
+                            minItems: {
+                                type: ["integer", "null"],
+                                minimum: 0
+                            }
+                        },
+                        additionalProperties: false
+                    }
+                ]
+            }
+        ],
+
+        messages: {
+            unexpectedOpeningLinebreak: "There should be no linebreak after '['.",
+            unexpectedClosingLinebreak: "There should be no linebreak before ']'.",
+            missingOpeningLinebreak: "A linebreak is required after '['.",
+            missingClosingLinebreak: "A linebreak is required before ']'."
+        }
+    },
+
+    create(context) {
+        const sourceCode = context.getSourceCode();
+
+
+        //----------------------------------------------------------------------
+        // Helpers
+        //----------------------------------------------------------------------
+
+        /**
+         * Normalizes a given option value.
+         * @param {string|Object|undefined} option An option value to parse.
+         * @returns {{multiline: boolean, minItems: number}} Normalized option object.
+         */
+        function normalizeOptionValue(option) {
+            let consistent = false;
+            let multiline = false;
+            let minItems = 0;
+
+            if (option) {
+                if (option === "consistent") {
+                    consistent = true;
+                    minItems = Number.POSITIVE_INFINITY;
+                } else if (option === "always" || option.minItems === 0) {
+                    minItems = 0;
+                } else if (option === "never") {
+                    minItems = Number.POSITIVE_INFINITY;
+                } else {
+                    multiline = Boolean(option.multiline);
+                    minItems = option.minItems || Number.POSITIVE_INFINITY;
+                }
+            } else {
+                consistent = false;
+                multiline = true;
+                minItems = Number.POSITIVE_INFINITY;
+            }
+
+            return { consistent, multiline, minItems };
+        }
+
+        /**
+         * Normalizes a given option value.
+         * @param {string|Object|undefined} options An option value to parse.
+         * @returns {{ArrayExpression: {multiline: boolean, minItems: number}, ArrayPattern: {multiline: boolean, minItems: number}}} Normalized option object.
+         */
+        function normalizeOptions(options) {
+            const value = normalizeOptionValue(options);
+
+            return { ArrayExpression: value, ArrayPattern: value };
+        }
+
+        /**
+         * Reports that there shouldn't be a linebreak after the first token
+         * @param {ASTNode} node The node to report in the event of an error.
+         * @param {Token} token The token to use for the report.
+         * @returns {void}
+         */
+        function reportNoBeginningLinebreak(node, token) {
+            context.report({
+                node,
+                loc: token.loc,
+                messageId: "unexpectedOpeningLinebreak",
+                fix(fixer) {
+                    const nextToken = sourceCode.getTokenAfter(token, { includeComments: true });
+
+                    if (astUtils.isCommentToken(nextToken)) {
+                        return null;
+                    }
+
+                    return fixer.removeRange([token.range[1], nextToken.range[0]]);
+                }
+            });
+        }
+
+        /**
+         * Reports that there shouldn't be a linebreak before the last token
+         * @param {ASTNode} node The node to report in the event of an error.
+         * @param {Token} token The token to use for the report.
+         * @returns {void}
+         */
+        function reportNoEndingLinebreak(node, token) {
+            context.report({
+                node,
+                loc: token.loc,
+                messageId: "unexpectedClosingLinebreak",
+                fix(fixer) {
+                    const previousToken = sourceCode.getTokenBefore(token, { includeComments: true });
+
+                    if (astUtils.isCommentToken(previousToken)) {
+                        return null;
+                    }
+
+                    return fixer.removeRange([previousToken.range[1], token.range[0]]);
+                }
+            });
+        }
+
+        /**
+         * Reports that there should be a linebreak after the first token
+         * @param {ASTNode} node The node to report in the event of an error.
+         * @param {Token} token The token to use for the report.
+         * @returns {void}
+         */
+        function reportRequiredBeginningLinebreak(node, token) {
+            context.report({
+                node,
+                loc: token.loc,
+                messageId: "missingOpeningLinebreak",
+                fix(fixer) {
+                    return fixer.insertTextAfter(token, "\n");
+                }
+            });
+        }
+
+        /**
+         * Reports that there should be a linebreak before the last token
+         * @param {ASTNode} node The node to report in the event of an error.
+         * @param {Token} token The token to use for the report.
+         * @returns {void}
+         */
+        function reportRequiredEndingLinebreak(node, token) {
+            context.report({
+                node,
+                loc: token.loc,
+                messageId: "missingClosingLinebreak",
+                fix(fixer) {
+                    return fixer.insertTextBefore(token, "\n");
+                }
+            });
+        }
+
+        /**
+         * Reports a given node if it violated this rule.
+         * @param {ASTNode} node A node to check. This is an ArrayExpression node or an ArrayPattern node.
+         * @returns {void}
+         */
+        function check(node) {
+            const elements = node.elements;
+            const normalizedOptions = normalizeOptions(context.options[0]);
+            const options = normalizedOptions[node.type];
+            const openBracket = sourceCode.getFirstToken(node);
+            const closeBracket = sourceCode.getLastToken(node);
+            const firstIncComment = sourceCode.getTokenAfter(openBracket, { includeComments: true });
+            const lastIncComment = sourceCode.getTokenBefore(closeBracket, { includeComments: true });
+            const first = sourceCode.getTokenAfter(openBracket);
+            const last = sourceCode.getTokenBefore(closeBracket);
+
+            const needsLinebreaks = (
+                elements.length >= options.minItems ||
+                (
+                    options.multiline &&
+                    elements.length > 0 &&
+                    firstIncComment.loc.start.line !== lastIncComment.loc.end.line
+                ) ||
+                (
+                    elements.length === 0 &&
+                    firstIncComment.type === "Block" &&
+                    firstIncComment.loc.start.line !== lastIncComment.loc.end.line &&
+                    firstIncComment === lastIncComment
+                ) ||
+                (
+                    options.consistent &&
+                    openBracket.loc.end.line !== first.loc.start.line
+                )
+            );
+
+            /*
+             * Use tokens or comments to check multiline or not.
+             * But use only tokens to check whether linebreaks are needed.
+             * This allows:
+             *     var arr = [ // eslint-disable-line foo
+             *         'a'
+             *     ]
+             */
+
+            if (needsLinebreaks) {
+                if (astUtils.isTokenOnSameLine(openBracket, first)) {
+                    reportRequiredBeginningLinebreak(node, openBracket);
+                }
+                if (astUtils.isTokenOnSameLine(last, closeBracket)) {
+                    reportRequiredEndingLinebreak(node, closeBracket);
+                }
+            } else {
+                if (!astUtils.isTokenOnSameLine(openBracket, first)) {
+                    reportNoBeginningLinebreak(node, openBracket);
+                }
+                if (!astUtils.isTokenOnSameLine(last, closeBracket)) {
+                    reportNoEndingLinebreak(node, closeBracket);
+                }
+            }
+        }
+
+        //----------------------------------------------------------------------
+        // Public
+        //----------------------------------------------------------------------
+
+        return {
+            ArrayPattern: check,
+            ArrayExpression: check
+        };
+    }
+};

node_modules/eslint/lib/rules/array-bracket-spacing.js

@@ -0,0 +1,241 @@
+/**
+ * @fileoverview Disallows or enforces spaces inside of array brackets.
+ * @author Jamund Ferguson
+ */
+"use strict";
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce consistent spacing inside array brackets",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/array-bracket-spacing"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                enum: ["always", "never"]
+            },
+            {
+                type: "object",
+                properties: {
+                    singleValue: {
+                        type: "boolean"
+                    },
+                    objectsInArrays: {
+                        type: "boolean"
+                    },
+                    arraysInArrays: {
+                        type: "boolean"
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+
+        messages: {
+            unexpectedSpaceAfter: "There should be no space after '{{tokenValue}}'.",
+            unexpectedSpaceBefore: "There should be no space before '{{tokenValue}}'.",
+            missingSpaceAfter: "A space is required after '{{tokenValue}}'.",
+            missingSpaceBefore: "A space is required before '{{tokenValue}}'."
+        }
+    },
+    create(context) {
+        const spaced = context.options[0] === "always",
+            sourceCode = context.getSourceCode();
+
+        /**
+         * Determines whether an option is set, relative to the spacing option.
+         * If spaced is "always", then check whether option is set to false.
+         * If spaced is "never", then check whether option is set to true.
+         * @param {Object} option The option to exclude.
+         * @returns {boolean} Whether or not the property is excluded.
+         */
+        function isOptionSet(option) {
+            return context.options[1] ? context.options[1][option] === !spaced : false;
+        }
+
+        const options = {
+            spaced,
+            singleElementException: isOptionSet("singleValue"),
+            objectsInArraysException: isOptionSet("objectsInArrays"),
+            arraysInArraysException: isOptionSet("arraysInArrays")
+        };
+
+        //--------------------------------------------------------------------------
+        // Helpers
+        //--------------------------------------------------------------------------
+
+        /**
+         * Reports that there shouldn't be a space after the first token
+         * @param {ASTNode} node The node to report in the event of an error.
+         * @param {Token} token The token to use for the report.
+         * @returns {void}
+         */
+        function reportNoBeginningSpace(node, token) {
+            const nextToken = sourceCode.getTokenAfter(token);
+
+            context.report({
+                node,
+                loc: { start: token.loc.end, end: nextToken.loc.start },
+                messageId: "unexpectedSpaceAfter",
+                data: {
+                    tokenValue: token.value
+                },
+                fix(fixer) {
+                    return fixer.removeRange([token.range[1], nextToken.range[0]]);
+                }
+            });
+        }
+
+        /**
+         * Reports that there shouldn't be a space before the last token
+         * @param {ASTNode} node The node to report in the event of an error.
+         * @param {Token} token The token to use for the report.
+         * @returns {void}
+         */
+        function reportNoEndingSpace(node, token) {
+            const previousToken = sourceCode.getTokenBefore(token);
+
+            context.report({
+                node,
+                loc: { start: previousToken.loc.end, end: token.loc.start },
+                messageId: "unexpectedSpaceBefore",
+                data: {
+                    tokenValue: token.value
+                },
+                fix(fixer) {
+                    return fixer.removeRange([previousToken.range[1], token.range[0]]);
+                }
+            });
+        }
+
+        /**
+         * Reports that there should be a space after the first token
+         * @param {ASTNode} node The node to report in the event of an error.
+         * @param {Token} token The token to use for the report.
+         * @returns {void}
+         */
+        function reportRequiredBeginningSpace(node, token) {
+            context.report({
+                node,
+                loc: token.loc,
+                messageId: "missingSpaceAfter",
+                data: {
+                    tokenValue: token.value
+                },
+                fix(fixer) {
+                    return fixer.insertTextAfter(token, " ");
+                }
+            });
+        }
+
+        /**
+         * Reports that there should be a space before the last token
+         * @param {ASTNode} node The node to report in the event of an error.
+         * @param {Token} token The token to use for the report.
+         * @returns {void}
+         */
+        function reportRequiredEndingSpace(node, token) {
+            context.report({
+                node,
+                loc: token.loc,
+                messageId: "missingSpaceBefore",
+                data: {
+                    tokenValue: token.value
+                },
+                fix(fixer) {
+                    return fixer.insertTextBefore(token, " ");
+                }
+            });
+        }
+
+        /**
+         * Determines if a node is an object type
+         * @param {ASTNode} node The node to check.
+         * @returns {boolean} Whether or not the node is an object type.
+         */
+        function isObjectType(node) {
+            return node && (node.type === "ObjectExpression" || node.type === "ObjectPattern");
+        }
+
+        /**
+         * Determines if a node is an array type
+         * @param {ASTNode} node The node to check.
+         * @returns {boolean} Whether or not the node is an array type.
+         */
+        function isArrayType(node) {
+            return node && (node.type === "ArrayExpression" || node.type === "ArrayPattern");
+        }
+
+        /**
+         * Validates the spacing around array brackets
+         * @param {ASTNode} node The node we're checking for spacing
+         * @returns {void}
+         */
+        function validateArraySpacing(node) {
+            if (options.spaced && node.elements.length === 0) {
+                return;
+            }
+
+            const first = sourceCode.getFirstToken(node),
+                second = sourceCode.getFirstToken(node, 1),
+                last = node.typeAnnotation
+                    ? sourceCode.getTokenBefore(node.typeAnnotation)
+                    : sourceCode.getLastToken(node),
+                penultimate = sourceCode.getTokenBefore(last),
+                firstElement = node.elements[0],
+                lastElement = node.elements[node.elements.length - 1];
+
+            const openingBracketMustBeSpaced =
+                options.objectsInArraysException && isObjectType(firstElement) ||
+                options.arraysInArraysException && isArrayType(firstElement) ||
+                options.singleElementException && node.elements.length === 1
+                    ? !options.spaced : options.spaced;
+
+            const closingBracketMustBeSpaced =
+                options.objectsInArraysException && isObjectType(lastElement) ||
+                options.arraysInArraysException && isArrayType(lastElement) ||
+                options.singleElementException && node.elements.length === 1
+                    ? !options.spaced : options.spaced;
+
+            if (astUtils.isTokenOnSameLine(first, second)) {
+                if (openingBracketMustBeSpaced && !sourceCode.isSpaceBetweenTokens(first, second)) {
+                    reportRequiredBeginningSpace(node, first);
+                }
+                if (!openingBracketMustBeSpaced && sourceCode.isSpaceBetweenTokens(first, second)) {
+                    reportNoBeginningSpace(node, first);
+                }
+            }
+
+            if (first !== penultimate && astUtils.isTokenOnSameLine(penultimate, last)) {
+                if (closingBracketMustBeSpaced && !sourceCode.isSpaceBetweenTokens(penultimate, last)) {
+                    reportRequiredEndingSpace(node, last);
+                }
+                if (!closingBracketMustBeSpaced && sourceCode.isSpaceBetweenTokens(penultimate, last)) {
+                    reportNoEndingSpace(node, last);
+                }
+            }
+        }
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+            ArrayPattern: validateArraySpacing,
+            ArrayExpression: validateArraySpacing
+        };
+    }
+};

node_modules/eslint/lib/rules/array-callback-return.js

@@ -0,0 +1,296 @@
+/**
+ * @fileoverview Rule to enforce return statements in callbacks of array's methods
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+const TARGET_NODE_TYPE = /^(?:Arrow)?FunctionExpression$/u;
+const TARGET_METHODS = /^(?:every|filter|find(?:Index)?|flatMap|forEach|map|reduce(?:Right)?|some|sort)$/u;
+
+/**
+ * Checks a given code path segment is reachable.
+ * @param {CodePathSegment} segment A segment to check.
+ * @returns {boolean} `true` if the segment is reachable.
+ */
+function isReachable(segment) {
+    return segment.reachable;
+}
+
+/**
+ * Checks a given node is a member access which has the specified name's
+ * property.
+ * @param {ASTNode} node A node to check.
+ * @returns {boolean} `true` if the node is a member access which has
+ *      the specified name's property. The node may be a `(Chain|Member)Expression` node.
+ */
+function isTargetMethod(node) {
+    return astUtils.isSpecificMemberAccess(node, null, TARGET_METHODS);
+}
+
+/**
+ * Returns a human-legible description of an array method
+ * @param {string} arrayMethodName A method name to fully qualify
+ * @returns {string} the method name prefixed with `Array.` if it is a class method,
+ *      or else `Array.prototype.` if it is an instance method.
+ */
+function fullMethodName(arrayMethodName) {
+    if (["from", "of", "isArray"].includes(arrayMethodName)) {
+        return "Array.".concat(arrayMethodName);
+    }
+    return "Array.prototype.".concat(arrayMethodName);
+}
+
+/**
+ * Checks whether or not a given node is a function expression which is the
+ * callback of an array method, returning the method name.
+ * @param {ASTNode} node A node to check. This is one of
+ *      FunctionExpression or ArrowFunctionExpression.
+ * @returns {string} The method name if the node is a callback method,
+ *      null otherwise.
+ */
+function getArrayMethodName(node) {
+    let currentNode = node;
+
+    while (currentNode) {
+        const parent = currentNode.parent;
+
+        switch (parent.type) {
+
+            /*
+             * Looks up the destination. e.g.,
+             * foo.every(nativeFoo || function foo() { ... });
+             */
+            case "LogicalExpression":
+            case "ConditionalExpression":
+            case "ChainExpression":
+                currentNode = parent;
+                break;
+
+            /*
+             * If the upper function is IIFE, checks the destination of the return value.
+             * e.g.
+             *   foo.every((function() {
+             *     // setup...
+             *     return function callback() { ... };
+             *   })());
+             */
+            case "ReturnStatement": {
+                const func = astUtils.getUpperFunction(parent);
+
+                if (func === null || !astUtils.isCallee(func)) {
+                    return null;
+                }
+                currentNode = func.parent;
+                break;
+            }
+
+            /*
+             * e.g.
+             *   Array.from([], function() {});
+             *   list.every(function() {});
+             */
+            case "CallExpression":
+                if (astUtils.isArrayFromMethod(parent.callee)) {
+                    if (
+                        parent.arguments.length >= 2 &&
+                        parent.arguments[1] === currentNode
+                    ) {
+                        return "from";
+                    }
+                }
+                if (isTargetMethod(parent.callee)) {
+                    if (
+                        parent.arguments.length >= 1 &&
+                        parent.arguments[0] === currentNode
+                    ) {
+                        return astUtils.getStaticPropertyName(parent.callee);
+                    }
+                }
+                return null;
+
+            // Otherwise this node is not target.
+            default:
+                return null;
+        }
+    }
+
+    /* istanbul ignore next: unreachable */
+    return null;
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "problem",
+
+        docs: {
+            description: "enforce `return` statements in callbacks of array methods",
+            category: "Best Practices",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/array-callback-return"
+        },
+
+        schema: [
+            {
+                type: "object",
+                properties: {
+                    allowImplicit: {
+                        type: "boolean",
+                        default: false
+                    },
+                    checkForEach: {
+                        type: "boolean",
+                        default: false
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+
+        messages: {
+            expectedAtEnd: "{{arrayMethodName}}() expects a value to be returned at the end of {{name}}.",
+            expectedInside: "{{arrayMethodName}}() expects a return value from {{name}}.",
+            expectedReturnValue: "{{arrayMethodName}}() expects a return value from {{name}}.",
+            expectedNoReturnValue: "{{arrayMethodName}}() expects no useless return value from {{name}}."
+        }
+    },
+
+    create(context) {
+
+        const options = context.options[0] || { allowImplicit: false, checkForEach: false };
+        const sourceCode = context.getSourceCode();
+
+        let funcInfo = {
+            arrayMethodName: null,
+            upper: null,
+            codePath: null,
+            hasReturn: false,
+            shouldCheck: false,
+            node: null
+        };
+
+        /**
+         * Checks whether or not the last code path segment is reachable.
+         * Then reports this function if the segment is reachable.
+         *
+         * If the last code path segment is reachable, there are paths which are not
+         * returned or thrown.
+         * @param {ASTNode} node A node to check.
+         * @returns {void}
+         */
+        function checkLastSegment(node) {
+
+            if (!funcInfo.shouldCheck) {
+                return;
+            }
+
+            let messageId = null;
+
+            if (funcInfo.arrayMethodName === "forEach") {
+                if (options.checkForEach && node.type === "ArrowFunctionExpression" && node.expression) {
+                    messageId = "expectedNoReturnValue";
+                }
+            } else {
+                if (node.body.type === "BlockStatement" && funcInfo.codePath.currentSegments.some(isReachable)) {
+                    messageId = funcInfo.hasReturn ? "expectedAtEnd" : "expectedInside";
+                }
+            }
+
+            if (messageId) {
+                const name = astUtils.getFunctionNameWithKind(node);
+
+                context.report({
+                    node,
+                    loc: astUtils.getFunctionHeadLoc(node, sourceCode),
+                    messageId,
+                    data: { name, arrayMethodName: fullMethodName(funcInfo.arrayMethodName) }
+                });
+            }
+        }
+
+        return {
+
+            // Stacks this function's information.
+            onCodePathStart(codePath, node) {
+
+                let methodName = null;
+
+                if (TARGET_NODE_TYPE.test(node.type)) {
+                    methodName = getArrayMethodName(node);
+                }
+
+                funcInfo = {
+                    arrayMethodName: methodName,
+                    upper: funcInfo,
+                    codePath,
+                    hasReturn: false,
+                    shouldCheck:
+                        methodName &&
+                        !node.async &&
+                        !node.generator,
+                    node
+                };
+            },
+
+            // Pops this function's information.
+            onCodePathEnd() {
+                funcInfo = funcInfo.upper;
+            },
+
+            // Checks the return statement is valid.
+            ReturnStatement(node) {
+
+                if (!funcInfo.shouldCheck) {
+                    return;
+                }
+
+                funcInfo.hasReturn = true;
+
+                let messageId = null;
+
+                if (funcInfo.arrayMethodName === "forEach") {
+
+                    // if checkForEach: true, returning a value at any path inside a forEach is not allowed
+                    if (options.checkForEach && node.argument) {
+                        messageId = "expectedNoReturnValue";
+                    }
+                } else {
+
+                    // if allowImplicit: false, should also check node.argument
+                    if (!options.allowImplicit && !node.argument) {
+                        messageId = "expectedReturnValue";
+                    }
+                }
+
+                if (messageId) {
+                    context.report({
+                        node,
+                        messageId,
+                        data: {
+                            name: astUtils.getFunctionNameWithKind(funcInfo.node),
+                            arrayMethodName: fullMethodName(funcInfo.arrayMethodName)
+                        }
+                    });
+                }
+            },
+
+            // Reports a given function if the last path is reachable.
+            "FunctionExpression:exit": checkLastSegment,
+            "ArrowFunctionExpression:exit": checkLastSegment
+        };
+    }
+};

node_modules/eslint/lib/rules/array-element-newline.js

@@ -0,0 +1,301 @@
+/**
+ * @fileoverview Rule to enforce line breaks after each array element
+ * @author Jan Peer Stöcklmair <https://github.com/JPeer264>
+ */
+
+"use strict";
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce line breaks after each array element",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/array-element-newline"
+        },
+
+        fixable: "whitespace",
+
+        schema: {
+            definitions: {
+                basicConfig: {
+                    oneOf: [
+                        {
+                            enum: ["always", "never", "consistent"]
+                        },
+                        {
+                            type: "object",
+                            properties: {
+                                multiline: {
+                                    type: "boolean"
+                                },
+                                minItems: {
+                                    type: ["integer", "null"],
+                                    minimum: 0
+                                }
+                            },
+                            additionalProperties: false
+                        }
+                    ]
+                }
+            },
+            items: [
+                {
+                    oneOf: [
+                        {
+                            $ref: "#/definitions/basicConfig"
+                        },
+                        {
+                            type: "object",
+                            properties: {
+                                ArrayExpression: {
+                                    $ref: "#/definitions/basicConfig"
+                                },
+                                ArrayPattern: {
+                                    $ref: "#/definitions/basicConfig"
+                                }
+                            },
+                            additionalProperties: false,
+                            minProperties: 1
+                        }
+                    ]
+                }
+            ]
+        },
+
+        messages: {
+            unexpectedLineBreak: "There should be no linebreak here.",
+            missingLineBreak: "There should be a linebreak after this element."
+        }
+    },
+
+    create(context) {
+        const sourceCode = context.getSourceCode();
+
+        //----------------------------------------------------------------------
+        // Helpers
+        //----------------------------------------------------------------------
+
+        /**
+         * Normalizes a given option value.
+         * @param {string|Object|undefined} providedOption An option value to parse.
+         * @returns {{multiline: boolean, minItems: number}} Normalized option object.
+         */
+        function normalizeOptionValue(providedOption) {
+            let consistent = false;
+            let multiline = false;
+            let minItems;
+
+            const option = providedOption || "always";
+
+            if (!option || option === "always" || option.minItems === 0) {
+                minItems = 0;
+            } else if (option === "never") {
+                minItems = Number.POSITIVE_INFINITY;
+            } else if (option === "consistent") {
+                consistent = true;
+                minItems = Number.POSITIVE_INFINITY;
+            } else {
+                multiline = Boolean(option.multiline);
+                minItems = option.minItems || Number.POSITIVE_INFINITY;
+            }
+
+            return { consistent, multiline, minItems };
+        }
+
+        /**
+         * Normalizes a given option value.
+         * @param {string|Object|undefined} options An option value to parse.
+         * @returns {{ArrayExpression: {multiline: boolean, minItems: number}, ArrayPattern: {multiline: boolean, minItems: number}}} Normalized option object.
+         */
+        function normalizeOptions(options) {
+            if (options && (options.ArrayExpression || options.ArrayPattern)) {
+                let expressionOptions, patternOptions;
+
+                if (options.ArrayExpression) {
+                    expressionOptions = normalizeOptionValue(options.ArrayExpression);
+                }
+
+                if (options.ArrayPattern) {
+                    patternOptions = normalizeOptionValue(options.ArrayPattern);
+                }
+
+                return { ArrayExpression: expressionOptions, ArrayPattern: patternOptions };
+            }
+
+            const value = normalizeOptionValue(options);
+
+            return { ArrayExpression: value, ArrayPattern: value };
+        }
+
+        /**
+         * Reports that there shouldn't be a line break after the first token
+         * @param {Token} token The token to use for the report.
+         * @returns {void}
+         */
+        function reportNoLineBreak(token) {
+            const tokenBefore = sourceCode.getTokenBefore(token, { includeComments: true });
+
+            context.report({
+                loc: {
+                    start: tokenBefore.loc.end,
+                    end: token.loc.start
+                },
+                messageId: "unexpectedLineBreak",
+                fix(fixer) {
+                    if (astUtils.isCommentToken(tokenBefore)) {
+                        return null;
+                    }
+
+                    if (!astUtils.isTokenOnSameLine(tokenBefore, token)) {
+                        return fixer.replaceTextRange([tokenBefore.range[1], token.range[0]], " ");
+                    }
+
+                    /*
+                     * This will check if the comma is on the same line as the next element
+                     * Following array:
+                     * [
+                     *     1
+                     *     , 2
+                     *     , 3
+                     * ]
+                     *
+                     * will be fixed to:
+                     * [
+                     *     1, 2, 3
+                     * ]
+                     */
+                    const twoTokensBefore = sourceCode.getTokenBefore(tokenBefore, { includeComments: true });
+
+                    if (astUtils.isCommentToken(twoTokensBefore)) {
+                        return null;
+                    }
+
+                    return fixer.replaceTextRange([twoTokensBefore.range[1], tokenBefore.range[0]], "");
+
+                }
+            });
+        }
+
+        /**
+         * Reports that there should be a line break after the first token
+         * @param {Token} token The token to use for the report.
+         * @returns {void}
+         */
+        function reportRequiredLineBreak(token) {
+            const tokenBefore = sourceCode.getTokenBefore(token, { includeComments: true });
+
+            context.report({
+                loc: {
+                    start: tokenBefore.loc.end,
+                    end: token.loc.start
+                },
+                messageId: "missingLineBreak",
+                fix(fixer) {
+                    return fixer.replaceTextRange([tokenBefore.range[1], token.range[0]], "\n");
+                }
+            });
+        }
+
+        /**
+         * Reports a given node if it violated this rule.
+         * @param {ASTNode} node A node to check. This is an ObjectExpression node or an ObjectPattern node.
+         * @returns {void}
+         */
+        function check(node) {
+            const elements = node.elements;
+            const normalizedOptions = normalizeOptions(context.options[0]);
+            const options = normalizedOptions[node.type];
+
+            if (!options) {
+                return;
+            }
+
+            let elementBreak = false;
+
+            /*
+             * MULTILINE: true
+             * loop through every element and check
+             * if at least one element has linebreaks inside
+             * this ensures that following is not valid (due to elements are on the same line):
+             *
+             * [
+             *      1,
+             *      2,
+             *      3
+             * ]
+             */
+            if (options.multiline) {
+                elementBreak = elements
+                    .filter(element => element !== null)
+                    .some(element => element.loc.start.line !== element.loc.end.line);
+            }
+
+            const linebreaksCount = node.elements.map((element, i) => {
+                const previousElement = elements[i - 1];
+
+                if (i === 0 || element === null || previousElement === null) {
+                    return false;
+                }
+
+                const commaToken = sourceCode.getFirstTokenBetween(previousElement, element, astUtils.isCommaToken);
+                const lastTokenOfPreviousElement = sourceCode.getTokenBefore(commaToken);
+                const firstTokenOfCurrentElement = sourceCode.getTokenAfter(commaToken);
+
+                return !astUtils.isTokenOnSameLine(lastTokenOfPreviousElement, firstTokenOfCurrentElement);
+            }).filter(isBreak => isBreak === true).length;
+
+            const needsLinebreaks = (
+                elements.length >= options.minItems ||
+                (
+                    options.multiline &&
+                    elementBreak
+                ) ||
+                (
+                    options.consistent &&
+                    linebreaksCount > 0 &&
+                    linebreaksCount < node.elements.length
+                )
+            );
+
+            elements.forEach((element, i) => {
+                const previousElement = elements[i - 1];
+
+                if (i === 0 || element === null || previousElement === null) {
+                    return;
+                }
+
+                const commaToken = sourceCode.getFirstTokenBetween(previousElement, element, astUtils.isCommaToken);
+                const lastTokenOfPreviousElement = sourceCode.getTokenBefore(commaToken);
+                const firstTokenOfCurrentElement = sourceCode.getTokenAfter(commaToken);
+
+                if (needsLinebreaks) {
+                    if (astUtils.isTokenOnSameLine(lastTokenOfPreviousElement, firstTokenOfCurrentElement)) {
+                        reportRequiredLineBreak(firstTokenOfCurrentElement);
+                    }
+                } else {
+                    if (!astUtils.isTokenOnSameLine(lastTokenOfPreviousElement, firstTokenOfCurrentElement)) {
+                        reportNoLineBreak(firstTokenOfCurrentElement);
+                    }
+                }
+            });
+        }
+
+        //----------------------------------------------------------------------
+        // Public
+        //----------------------------------------------------------------------
+
+        return {
+            ArrayPattern: check,
+            ArrayExpression: check
+        };
+    }
+};

node_modules/eslint/lib/rules/arrow-body-style.js

@@ -0,0 +1,296 @@
+/**
+ * @fileoverview Rule to require braces in arrow function body.
+ * @author Alberto Rodríguez
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "require braces around arrow function bodies",
+            category: "ECMAScript 6",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/arrow-body-style"
+        },
+
+        schema: {
+            anyOf: [
+                {
+                    type: "array",
+                    items: [
+                        {
+                            enum: ["always", "never"]
+                        }
+                    ],
+                    minItems: 0,
+                    maxItems: 1
+                },
+                {
+                    type: "array",
+                    items: [
+                        {
+                            enum: ["as-needed"]
+                        },
+                        {
+                            type: "object",
+                            properties: {
+                                requireReturnForObjectLiteral: { type: "boolean" }
+                            },
+                            additionalProperties: false
+                        }
+                    ],
+                    minItems: 0,
+                    maxItems: 2
+                }
+            ]
+        },
+
+        fixable: "code",
+
+        messages: {
+            unexpectedOtherBlock: "Unexpected block statement surrounding arrow body.",
+            unexpectedEmptyBlock: "Unexpected block statement surrounding arrow body; put a value of `undefined` immediately after the `=>`.",
+            unexpectedObjectBlock: "Unexpected block statement surrounding arrow body; parenthesize the returned value and move it immediately after the `=>`.",
+            unexpectedSingleBlock: "Unexpected block statement surrounding arrow body; move the returned value immediately after the `=>`.",
+            expectedBlock: "Expected block statement surrounding arrow body."
+        }
+    },
+
+    create(context) {
+        const options = context.options;
+        const always = options[0] === "always";
+        const asNeeded = !options[0] || options[0] === "as-needed";
+        const never = options[0] === "never";
+        const requireReturnForObjectLiteral = options[1] && options[1].requireReturnForObjectLiteral;
+        const sourceCode = context.getSourceCode();
+        let funcInfo = null;
+
+        /**
+         * Checks whether the given node has ASI problem or not.
+         * @param {Token} token The token to check.
+         * @returns {boolean} `true` if it changes semantics if `;` or `}` followed by the token are removed.
+         */
+        function hasASIProblem(token) {
+            return token && token.type === "Punctuator" && /^[([/`+-]/u.test(token.value);
+        }
+
+        /**
+         * Gets the closing parenthesis by the given node.
+         * @param {ASTNode} node first node after an opening parenthesis.
+         * @returns {Token} The found closing parenthesis token.
+         */
+        function findClosingParen(node) {
+            let nodeToCheck = node;
+
+            while (!astUtils.isParenthesised(sourceCode, nodeToCheck)) {
+                nodeToCheck = nodeToCheck.parent;
+            }
+            return sourceCode.getTokenAfter(nodeToCheck);
+        }
+
+        /**
+         * Check whether the node is inside of a for loop's init
+         * @param {ASTNode} node node is inside for loop
+         * @returns {boolean} `true` if the node is inside of a for loop, else `false`
+         */
+        function isInsideForLoopInitializer(node) {
+            if (node && node.parent) {
+                if (node.parent.type === "ForStatement" && node.parent.init === node) {
+                    return true;
+                }
+                return isInsideForLoopInitializer(node.parent);
+            }
+            return false;
+        }
+
+        /**
+         * Determines whether a arrow function body needs braces
+         * @param {ASTNode} node The arrow function node.
+         * @returns {void}
+         */
+        function validate(node) {
+            const arrowBody = node.body;
+
+            if (arrowBody.type === "BlockStatement") {
+                const blockBody = arrowBody.body;
+
+                if (blockBody.length !== 1 && !never) {
+                    return;
+                }
+
+                if (asNeeded && requireReturnForObjectLiteral && blockBody[0].type === "ReturnStatement" &&
+                    blockBody[0].argument && blockBody[0].argument.type === "ObjectExpression") {
+                    return;
+                }
+
+                if (never || asNeeded && blockBody[0].type === "ReturnStatement") {
+                    let messageId;
+
+                    if (blockBody.length === 0) {
+                        messageId = "unexpectedEmptyBlock";
+                    } else if (blockBody.length > 1) {
+                        messageId = "unexpectedOtherBlock";
+                    } else if (blockBody[0].argument === null) {
+                        messageId = "unexpectedSingleBlock";
+                    } else if (astUtils.isOpeningBraceToken(sourceCode.getFirstToken(blockBody[0], { skip: 1 }))) {
+                        messageId = "unexpectedObjectBlock";
+                    } else {
+                        messageId = "unexpectedSingleBlock";
+                    }
+
+                    context.report({
+                        node,
+                        loc: arrowBody.loc,
+                        messageId,
+                        fix(fixer) {
+                            const fixes = [];
+
+                            if (blockBody.length !== 1 ||
+                                blockBody[0].type !== "ReturnStatement" ||
+                                !blockBody[0].argument ||
+                                hasASIProblem(sourceCode.getTokenAfter(arrowBody))
+                            ) {
+                                return fixes;
+                            }
+
+                            const openingBrace = sourceCode.getFirstToken(arrowBody);
+                            const closingBrace = sourceCode.getLastToken(arrowBody);
+                            const firstValueToken = sourceCode.getFirstToken(blockBody[0], 1);
+                            const lastValueToken = sourceCode.getLastToken(blockBody[0]);
+                            const commentsExist =
+                                sourceCode.commentsExistBetween(openingBrace, firstValueToken) ||
+                                sourceCode.commentsExistBetween(lastValueToken, closingBrace);
+
+                            /*
+                             * Remove tokens around the return value.
+                             * If comments don't exist, remove extra spaces as well.
+                             */
+                            if (commentsExist) {
+                                fixes.push(
+                                    fixer.remove(openingBrace),
+                                    fixer.remove(closingBrace),
+                                    fixer.remove(sourceCode.getTokenAfter(openingBrace)) // return keyword
+                                );
+                            } else {
+                                fixes.push(
+                                    fixer.removeRange([openingBrace.range[0], firstValueToken.range[0]]),
+                                    fixer.removeRange([lastValueToken.range[1], closingBrace.range[1]])
+                                );
+                            }
+
+                            /*
+                             * If the first token of the return value is `{` or the return value is a sequence expression,
+                             * enclose the return value by parentheses to avoid syntax error.
+                             */
+                            if (astUtils.isOpeningBraceToken(firstValueToken) || blockBody[0].argument.type === "SequenceExpression" || (funcInfo.hasInOperator && isInsideForLoopInitializer(node))) {
+                                if (!astUtils.isParenthesised(sourceCode, blockBody[0].argument)) {
+                                    fixes.push(
+                                        fixer.insertTextBefore(firstValueToken, "("),
+                                        fixer.insertTextAfter(lastValueToken, ")")
+                                    );
+                                }
+                            }
+
+                            /*
+                             * If the last token of the return statement is semicolon, remove it.
+                             * Non-block arrow body is an expression, not a statement.
+                             */
+                            if (astUtils.isSemicolonToken(lastValueToken)) {
+                                fixes.push(fixer.remove(lastValueToken));
+                            }
+
+                            return fixes;
+                        }
+                    });
+                }
+            } else {
+                if (always || (asNeeded && requireReturnForObjectLiteral && arrowBody.type === "ObjectExpression")) {
+                    context.report({
+                        node,
+                        loc: arrowBody.loc,
+                        messageId: "expectedBlock",
+                        fix(fixer) {
+                            const fixes = [];
+                            const arrowToken = sourceCode.getTokenBefore(arrowBody, astUtils.isArrowToken);
+                            const [firstTokenAfterArrow, secondTokenAfterArrow] = sourceCode.getTokensAfter(arrowToken, { count: 2 });
+                            const lastToken = sourceCode.getLastToken(node);
+
+                            let parenthesisedObjectLiteral = null;
+
+                            if (
+                                astUtils.isOpeningParenToken(firstTokenAfterArrow) &&
+                                astUtils.isOpeningBraceToken(secondTokenAfterArrow)
+                            ) {
+                                const braceNode = sourceCode.getNodeByRangeIndex(secondTokenAfterArrow.range[0]);
+
+                                if (braceNode.type === "ObjectExpression") {
+                                    parenthesisedObjectLiteral = braceNode;
+                                }
+                            }
+
+                            // If the value is object literal, remove parentheses which were forced by syntax.
+                            if (parenthesisedObjectLiteral) {
+                                const openingParenToken = firstTokenAfterArrow;
+                                const openingBraceToken = secondTokenAfterArrow;
+
+                                if (astUtils.isTokenOnSameLine(openingParenToken, openingBraceToken)) {
+                                    fixes.push(fixer.replaceText(openingParenToken, "{return "));
+                                } else {
+
+                                    // Avoid ASI
+                                    fixes.push(
+                                        fixer.replaceText(openingParenToken, "{"),
+                                        fixer.insertTextBefore(openingBraceToken, "return ")
+                                    );
+                                }
+
+                                // Closing paren for the object doesn't have to be lastToken, e.g.: () => ({}).foo()
+                                fixes.push(fixer.remove(findClosingParen(parenthesisedObjectLiteral)));
+                                fixes.push(fixer.insertTextAfter(lastToken, "}"));
+
+                            } else {
+                                fixes.push(fixer.insertTextBefore(firstTokenAfterArrow, "{return "));
+                                fixes.push(fixer.insertTextAfter(lastToken, "}"));
+                            }
+
+                            return fixes;
+                        }
+                    });
+                }
+            }
+        }
+
+        return {
+            "BinaryExpression[operator='in']"() {
+                let info = funcInfo;
+
+                while (info) {
+                    info.hasInOperator = true;
+                    info = info.upper;
+                }
+            },
+            ArrowFunctionExpression() {
+                funcInfo = {
+                    upper: funcInfo,
+                    hasInOperator: false
+                };
+            },
+            "ArrowFunctionExpression:exit"(node) {
+                validate(node);
+                funcInfo = funcInfo.upper;
+            }
+        };
+    }
+};

node_modules/eslint/lib/rules/arrow-parens.js

@@ -0,0 +1,183 @@
+/**
+ * @fileoverview Rule to require parens in arrow function arguments.
+ * @author Jxck
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Determines if the given arrow function has block body.
+ * @param {ASTNode} node `ArrowFunctionExpression` node.
+ * @returns {boolean} `true` if the function has block body.
+ */
+function hasBlockBody(node) {
+    return node.body.type === "BlockStatement";
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "require parentheses around arrow function arguments",
+            category: "ECMAScript 6",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/arrow-parens"
+        },
+
+        fixable: "code",
+
+        schema: [
+            {
+                enum: ["always", "as-needed"]
+            },
+            {
+                type: "object",
+                properties: {
+                    requireForBlockBody: {
+                        type: "boolean",
+                        default: false
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+
+        messages: {
+            unexpectedParens: "Unexpected parentheses around single function argument.",
+            expectedParens: "Expected parentheses around arrow function argument.",
+
+            unexpectedParensInline: "Unexpected parentheses around single function argument having a body with no curly braces.",
+            expectedParensBlock: "Expected parentheses around arrow function argument having a body with curly braces."
+        }
+    },
+
+    create(context) {
+        const asNeeded = context.options[0] === "as-needed";
+        const requireForBlockBody = asNeeded && context.options[1] && context.options[1].requireForBlockBody === true;
+
+        const sourceCode = context.getSourceCode();
+
+        /**
+         * Finds opening paren of parameters for the given arrow function, if it exists.
+         * It is assumed that the given arrow function has exactly one parameter.
+         * @param {ASTNode} node `ArrowFunctionExpression` node.
+         * @returns {Token|null} the opening paren, or `null` if the given arrow function doesn't have parens of parameters.
+         */
+        function findOpeningParenOfParams(node) {
+            const tokenBeforeParams = sourceCode.getTokenBefore(node.params[0]);
+
+            if (
+                tokenBeforeParams &&
+                astUtils.isOpeningParenToken(tokenBeforeParams) &&
+                node.range[0] <= tokenBeforeParams.range[0]
+            ) {
+                return tokenBeforeParams;
+            }
+
+            return null;
+        }
+
+        /**
+         * Finds closing paren of parameters for the given arrow function.
+         * It is assumed that the given arrow function has parens of parameters and that it has exactly one parameter.
+         * @param {ASTNode} node `ArrowFunctionExpression` node.
+         * @returns {Token} the closing paren of parameters.
+         */
+        function getClosingParenOfParams(node) {
+            return sourceCode.getTokenAfter(node.params[0], astUtils.isClosingParenToken);
+        }
+
+        /**
+         * Determines whether the given arrow function has comments inside parens of parameters.
+         * It is assumed that the given arrow function has parens of parameters.
+         * @param {ASTNode} node `ArrowFunctionExpression` node.
+         * @param {Token} openingParen Opening paren of parameters.
+         * @returns {boolean} `true` if the function has at least one comment inside of parens of parameters.
+         */
+        function hasCommentsInParensOfParams(node, openingParen) {
+            return sourceCode.commentsExistBetween(openingParen, getClosingParenOfParams(node));
+        }
+
+        /**
+         * Determines whether the given arrow function has unexpected tokens before opening paren of parameters,
+         * in which case it will be assumed that the existing parens of parameters are necessary.
+         * Only tokens within the range of the arrow function (tokens that are part of the arrow function) are taken into account.
+         * Example: <T>(a) => b
+         * @param {ASTNode} node `ArrowFunctionExpression` node.
+         * @param {Token} openingParen Opening paren of parameters.
+         * @returns {boolean} `true` if the function has at least one unexpected token.
+         */
+        function hasUnexpectedTokensBeforeOpeningParen(node, openingParen) {
+            const expectedCount = node.async ? 1 : 0;
+
+            return sourceCode.getFirstToken(node, { skip: expectedCount }) !== openingParen;
+        }
+
+        return {
+            "ArrowFunctionExpression[params.length=1]"(node) {
+                const shouldHaveParens = !asNeeded || requireForBlockBody && hasBlockBody(node);
+                const openingParen = findOpeningParenOfParams(node);
+                const hasParens = openingParen !== null;
+                const [param] = node.params;
+
+                if (shouldHaveParens && !hasParens) {
+                    context.report({
+                        node,
+                        messageId: requireForBlockBody ? "expectedParensBlock" : "expectedParens",
+                        loc: param.loc,
+                        *fix(fixer) {
+                            yield fixer.insertTextBefore(param, "(");
+                            yield fixer.insertTextAfter(param, ")");
+                        }
+                    });
+                }
+
+                if (
+                    !shouldHaveParens &&
+                    hasParens &&
+                    param.type === "Identifier" &&
+                    !param.typeAnnotation &&
+                    !node.returnType &&
+                    !hasCommentsInParensOfParams(node, openingParen) &&
+                    !hasUnexpectedTokensBeforeOpeningParen(node, openingParen)
+                ) {
+                    context.report({
+                        node,
+                        messageId: requireForBlockBody ? "unexpectedParensInline" : "unexpectedParens",
+                        loc: param.loc,
+                        *fix(fixer) {
+                            const tokenBeforeOpeningParen = sourceCode.getTokenBefore(openingParen);
+                            const closingParen = getClosingParenOfParams(node);
+
+                            if (
+                                tokenBeforeOpeningParen &&
+                                tokenBeforeOpeningParen.range[1] === openingParen.range[0] &&
+                                !astUtils.canTokensBeAdjacent(tokenBeforeOpeningParen, sourceCode.getFirstToken(param))
+                            ) {
+                                yield fixer.insertTextBefore(openingParen, " ");
+                            }
+
+                            // remove parens, whitespace inside parens, and possible trailing comma
+                            yield fixer.removeRange([openingParen.range[0], param.range[0]]);
+                            yield fixer.removeRange([param.range[1], closingParen.range[1]]);
+                        }
+                    });
+                }
+            }
+        };
+    }
+};

node_modules/eslint/lib/rules/arrow-spacing.js

@@ -0,0 +1,161 @@
+/**
+ * @fileoverview Rule to define spacing before/after arrow function's arrow.
+ * @author Jxck
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce consistent spacing before and after the arrow in arrow functions",
+            category: "ECMAScript 6",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/arrow-spacing"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                type: "object",
+                properties: {
+                    before: {
+                        type: "boolean",
+                        default: true
+                    },
+                    after: {
+                        type: "boolean",
+                        default: true
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+
+        messages: {
+            expectedBefore: "Missing space before =>.",
+            unexpectedBefore: "Unexpected space before =>.",
+
+            expectedAfter: "Missing space after =>.",
+            unexpectedAfter: "Unexpected space after =>."
+        }
+    },
+
+    create(context) {
+
+        // merge rules with default
+        const rule = Object.assign({}, context.options[0]);
+
+        rule.before = rule.before !== false;
+        rule.after = rule.after !== false;
+
+        const sourceCode = context.getSourceCode();
+
+        /**
+         * Get tokens of arrow(`=>`) and before/after arrow.
+         * @param {ASTNode} node The arrow function node.
+         * @returns {Object} Tokens of arrow and before/after arrow.
+         */
+        function getTokens(node) {
+            const arrow = sourceCode.getTokenBefore(node.body, astUtils.isArrowToken);
+
+            return {
+                before: sourceCode.getTokenBefore(arrow),
+                arrow,
+                after: sourceCode.getTokenAfter(arrow)
+            };
+        }
+
+        /**
+         * Count spaces before/after arrow(`=>`) token.
+         * @param {Object} tokens Tokens before/after arrow.
+         * @returns {Object} count of space before/after arrow.
+         */
+        function countSpaces(tokens) {
+            const before = tokens.arrow.range[0] - tokens.before.range[1];
+            const after = tokens.after.range[0] - tokens.arrow.range[1];
+
+            return { before, after };
+        }
+
+        /**
+         * Determines whether space(s) before after arrow(`=>`) is satisfy rule.
+         * if before/after value is `true`, there should be space(s).
+         * if before/after value is `false`, there should be no space.
+         * @param {ASTNode} node The arrow function node.
+         * @returns {void}
+         */
+        function spaces(node) {
+            const tokens = getTokens(node);
+            const countSpace = countSpaces(tokens);
+
+            if (rule.before) {
+
+                // should be space(s) before arrow
+                if (countSpace.before === 0) {
+                    context.report({
+                        node: tokens.before,
+                        messageId: "expectedBefore",
+                        fix(fixer) {
+                            return fixer.insertTextBefore(tokens.arrow, " ");
+                        }
+                    });
+                }
+            } else {
+
+                // should be no space before arrow
+                if (countSpace.before > 0) {
+                    context.report({
+                        node: tokens.before,
+                        messageId: "unexpectedBefore",
+                        fix(fixer) {
+                            return fixer.removeRange([tokens.before.range[1], tokens.arrow.range[0]]);
+                        }
+                    });
+                }
+            }
+
+            if (rule.after) {
+
+                // should be space(s) after arrow
+                if (countSpace.after === 0) {
+                    context.report({
+                        node: tokens.after,
+                        messageId: "expectedAfter",
+                        fix(fixer) {
+                            return fixer.insertTextAfter(tokens.arrow, " ");
+                        }
+                    });
+                }
+            } else {
+
+                // should be no space after arrow
+                if (countSpace.after > 0) {
+                    context.report({
+                        node: tokens.after,
+                        messageId: "unexpectedAfter",
+                        fix(fixer) {
+                            return fixer.removeRange([tokens.arrow.range[1], tokens.after.range[0]]);
+                        }
+                    });
+                }
+            }
+        }
+
+        return {
+            ArrowFunctionExpression: spaces
+        };
+    }
+};

node_modules/eslint/lib/rules/block-scoped-var.js

@@ -0,0 +1,122 @@
+/**
+ * @fileoverview Rule to check for "block scoped" variables by binding context
+ * @author Matt DuVall <http://www.mattduvall.com>
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "enforce the use of variables within the scope they are defined",
+            category: "Best Practices",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/block-scoped-var"
+        },
+
+        schema: [],
+
+        messages: {
+            outOfScope: "'{{name}}' used outside of binding context."
+        }
+    },
+
+    create(context) {
+        let stack = [];
+
+        /**
+         * Makes a block scope.
+         * @param {ASTNode} node A node of a scope.
+         * @returns {void}
+         */
+        function enterScope(node) {
+            stack.push(node.range);
+        }
+
+        /**
+         * Pops the last block scope.
+         * @returns {void}
+         */
+        function exitScope() {
+            stack.pop();
+        }
+
+        /**
+         * Reports a given reference.
+         * @param {eslint-scope.Reference} reference A reference to report.
+         * @returns {void}
+         */
+        function report(reference) {
+            const identifier = reference.identifier;
+
+            context.report({ node: identifier, messageId: "outOfScope", data: { name: identifier.name } });
+        }
+
+        /**
+         * Finds and reports references which are outside of valid scopes.
+         * @param {ASTNode} node A node to get variables.
+         * @returns {void}
+         */
+        function checkForVariables(node) {
+            if (node.kind !== "var") {
+                return;
+            }
+
+            // Defines a predicate to check whether or not a given reference is outside of valid scope.
+            const scopeRange = stack[stack.length - 1];
+
+            /**
+             * Check if a reference is out of scope
+             * @param {ASTNode} reference node to examine
+             * @returns {boolean} True is its outside the scope
+             * @private
+             */
+            function isOutsideOfScope(reference) {
+                const idRange = reference.identifier.range;
+
+                return idRange[0] < scopeRange[0] || idRange[1] > scopeRange[1];
+            }
+
+            // Gets declared variables, and checks its references.
+            const variables = context.getDeclaredVariables(node);
+
+            for (let i = 0; i < variables.length; ++i) {
+
+                // Reports.
+                variables[i]
+                    .references
+                    .filter(isOutsideOfScope)
+                    .forEach(report);
+            }
+        }
+
+        return {
+            Program(node) {
+                stack = [node.range];
+            },
+
+            // Manages scopes.
+            BlockStatement: enterScope,
+            "BlockStatement:exit": exitScope,
+            ForStatement: enterScope,
+            "ForStatement:exit": exitScope,
+            ForInStatement: enterScope,
+            "ForInStatement:exit": exitScope,
+            ForOfStatement: enterScope,
+            "ForOfStatement:exit": exitScope,
+            SwitchStatement: enterScope,
+            "SwitchStatement:exit": exitScope,
+            CatchClause: enterScope,
+            "CatchClause:exit": exitScope,
+
+            // Finds and reports references which are outside of valid scope.
+            VariableDeclaration: checkForVariables
+        };
+
+    }
+};

node_modules/eslint/lib/rules/block-spacing.js

@@ -0,0 +1,164 @@
+/**
+ * @fileoverview A rule to disallow or enforce spaces inside of single line blocks.
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+const util = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "disallow or enforce spaces inside of blocks after opening block and before closing block",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/block-spacing"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            { enum: ["always", "never"] }
+        ],
+
+        messages: {
+            missing: "Requires a space {{location}} '{{token}}'.",
+            extra: "Unexpected space(s) {{location}} '{{token}}'."
+        }
+    },
+
+    create(context) {
+        const always = (context.options[0] !== "never"),
+            messageId = always ? "missing" : "extra",
+            sourceCode = context.getSourceCode();
+
+        /**
+         * Gets the open brace token from a given node.
+         * @param {ASTNode} node A BlockStatement/SwitchStatement node to get.
+         * @returns {Token} The token of the open brace.
+         */
+        function getOpenBrace(node) {
+            if (node.type === "SwitchStatement") {
+                if (node.cases.length > 0) {
+                    return sourceCode.getTokenBefore(node.cases[0]);
+                }
+                return sourceCode.getLastToken(node, 1);
+            }
+            return sourceCode.getFirstToken(node);
+        }
+
+        /**
+         * Checks whether or not:
+         *   - given tokens are on same line.
+         *   - there is/isn't a space between given tokens.
+         * @param {Token} left A token to check.
+         * @param {Token} right The token which is next to `left`.
+         * @returns {boolean}
+         *    When the option is `"always"`, `true` if there are one or more spaces between given tokens.
+         *    When the option is `"never"`, `true` if there are not any spaces between given tokens.
+         *    If given tokens are not on same line, it's always `true`.
+         */
+        function isValid(left, right) {
+            return (
+                !util.isTokenOnSameLine(left, right) ||
+                sourceCode.isSpaceBetweenTokens(left, right) === always
+            );
+        }
+
+        /**
+         * Reports invalid spacing style inside braces.
+         * @param {ASTNode} node A BlockStatement/SwitchStatement node to get.
+         * @returns {void}
+         */
+        function checkSpacingInsideBraces(node) {
+
+            // Gets braces and the first/last token of content.
+            const openBrace = getOpenBrace(node);
+            const closeBrace = sourceCode.getLastToken(node);
+            const firstToken = sourceCode.getTokenAfter(openBrace, { includeComments: true });
+            const lastToken = sourceCode.getTokenBefore(closeBrace, { includeComments: true });
+
+            // Skip if the node is invalid or empty.
+            if (openBrace.type !== "Punctuator" ||
+                openBrace.value !== "{" ||
+                closeBrace.type !== "Punctuator" ||
+                closeBrace.value !== "}" ||
+                firstToken === closeBrace
+            ) {
+                return;
+            }
+
+            // Skip line comments for option never
+            if (!always && firstToken.type === "Line") {
+                return;
+            }
+
+            // Check.
+            if (!isValid(openBrace, firstToken)) {
+                let loc = openBrace.loc;
+
+                if (messageId === "extra") {
+                    loc = {
+                        start: openBrace.loc.end,
+                        end: firstToken.loc.start
+                    };
+                }
+
+                context.report({
+                    node,
+                    loc,
+                    messageId,
+                    data: {
+                        location: "after",
+                        token: openBrace.value
+                    },
+                    fix(fixer) {
+                        if (always) {
+                            return fixer.insertTextBefore(firstToken, " ");
+                        }
+
+                        return fixer.removeRange([openBrace.range[1], firstToken.range[0]]);
+                    }
+                });
+            }
+            if (!isValid(lastToken, closeBrace)) {
+                let loc = closeBrace.loc;
+
+                if (messageId === "extra") {
+                    loc = {
+                        start: lastToken.loc.end,
+                        end: closeBrace.loc.start
+                    };
+                }
+                context.report({
+                    node,
+                    loc,
+                    messageId,
+                    data: {
+                        location: "before",
+                        token: closeBrace.value
+                    },
+                    fix(fixer) {
+                        if (always) {
+                            return fixer.insertTextAfter(lastToken, " ");
+                        }
+
+                        return fixer.removeRange([lastToken.range[1], closeBrace.range[0]]);
+                    }
+                });
+            }
+        }
+
+        return {
+            BlockStatement: checkSpacingInsideBraces,
+            SwitchStatement: checkSpacingInsideBraces
+        };
+    }
+};

node_modules/eslint/lib/rules/brace-style.js

@@ -0,0 +1,188 @@
+/**
+ * @fileoverview Rule to flag block statements that do not use the one true brace style
+ * @author Ian Christian Myers
+ */
+
+"use strict";
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce consistent brace style for blocks",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/brace-style"
+        },
+
+        schema: [
+            {
+                enum: ["1tbs", "stroustrup", "allman"]
+            },
+            {
+                type: "object",
+                properties: {
+                    allowSingleLine: {
+                        type: "boolean",
+                        default: false
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+
+        fixable: "whitespace",
+
+        messages: {
+            nextLineOpen: "Opening curly brace does not appear on the same line as controlling statement.",
+            sameLineOpen: "Opening curly brace appears on the same line as controlling statement.",
+            blockSameLine: "Statement inside of curly braces should be on next line.",
+            nextLineClose: "Closing curly brace does not appear on the same line as the subsequent block.",
+            singleLineClose: "Closing curly brace should be on the same line as opening curly brace or on the line after the previous block.",
+            sameLineClose: "Closing curly brace appears on the same line as the subsequent block."
+        }
+    },
+
+    create(context) {
+        const style = context.options[0] || "1tbs",
+            params = context.options[1] || {},
+            sourceCode = context.getSourceCode();
+
+        //--------------------------------------------------------------------------
+        // Helpers
+        //--------------------------------------------------------------------------
+
+        /**
+         * Fixes a place where a newline unexpectedly appears
+         * @param {Token} firstToken The token before the unexpected newline
+         * @param {Token} secondToken The token after the unexpected newline
+         * @returns {Function} A fixer function to remove the newlines between the tokens
+         */
+        function removeNewlineBetween(firstToken, secondToken) {
+            const textRange = [firstToken.range[1], secondToken.range[0]];
+            const textBetween = sourceCode.text.slice(textRange[0], textRange[1]);
+
+            // Don't do a fix if there is a comment between the tokens
+            if (textBetween.trim()) {
+                return null;
+            }
+            return fixer => fixer.replaceTextRange(textRange, " ");
+        }
+
+        /**
+         * Validates a pair of curly brackets based on the user's config
+         * @param {Token} openingCurly The opening curly bracket
+         * @param {Token} closingCurly The closing curly bracket
+         * @returns {void}
+         */
+        function validateCurlyPair(openingCurly, closingCurly) {
+            const tokenBeforeOpeningCurly = sourceCode.getTokenBefore(openingCurly);
+            const tokenAfterOpeningCurly = sourceCode.getTokenAfter(openingCurly);
+            const tokenBeforeClosingCurly = sourceCode.getTokenBefore(closingCurly);
+            const singleLineException = params.allowSingleLine && astUtils.isTokenOnSameLine(openingCurly, closingCurly);
+
+            if (style !== "allman" && !astUtils.isTokenOnSameLine(tokenBeforeOpeningCurly, openingCurly)) {
+                context.report({
+                    node: openingCurly,
+                    messageId: "nextLineOpen",
+                    fix: removeNewlineBetween(tokenBeforeOpeningCurly, openingCurly)
+                });
+            }
+
+            if (style === "allman" && astUtils.isTokenOnSameLine(tokenBeforeOpeningCurly, openingCurly) && !singleLineException) {
+                context.report({
+                    node: openingCurly,
+                    messageId: "sameLineOpen",
+                    fix: fixer => fixer.insertTextBefore(openingCurly, "\n")
+                });
+            }
+
+            if (astUtils.isTokenOnSameLine(openingCurly, tokenAfterOpeningCurly) && tokenAfterOpeningCurly !== closingCurly && !singleLineException) {
+                context.report({
+                    node: openingCurly,
+                    messageId: "blockSameLine",
+                    fix: fixer => fixer.insertTextAfter(openingCurly, "\n")
+                });
+            }
+
+            if (tokenBeforeClosingCurly !== openingCurly && !singleLineException && astUtils.isTokenOnSameLine(tokenBeforeClosingCurly, closingCurly)) {
+                context.report({
+                    node: closingCurly,
+                    messageId: "singleLineClose",
+                    fix: fixer => fixer.insertTextBefore(closingCurly, "\n")
+                });
+            }
+        }
+
+        /**
+         * Validates the location of a token that appears before a keyword (e.g. a newline before `else`)
+         * @param {Token} curlyToken The closing curly token. This is assumed to precede a keyword token (such as `else` or `finally`).
+         * @returns {void}
+         */
+        function validateCurlyBeforeKeyword(curlyToken) {
+            const keywordToken = sourceCode.getTokenAfter(curlyToken);
+
+            if (style === "1tbs" && !astUtils.isTokenOnSameLine(curlyToken, keywordToken)) {
+                context.report({
+                    node: curlyToken,
+                    messageId: "nextLineClose",
+                    fix: removeNewlineBetween(curlyToken, keywordToken)
+                });
+            }
+
+            if (style !== "1tbs" && astUtils.isTokenOnSameLine(curlyToken, keywordToken)) {
+                context.report({
+                    node: curlyToken,
+                    messageId: "sameLineClose",
+                    fix: fixer => fixer.insertTextAfter(curlyToken, "\n")
+                });
+            }
+        }
+
+        //--------------------------------------------------------------------------
+        // Public API
+        //--------------------------------------------------------------------------
+
+        return {
+            BlockStatement(node) {
+                if (!astUtils.STATEMENT_LIST_PARENTS.has(node.parent.type)) {
+                    validateCurlyPair(sourceCode.getFirstToken(node), sourceCode.getLastToken(node));
+                }
+            },
+            ClassBody(node) {
+                validateCurlyPair(sourceCode.getFirstToken(node), sourceCode.getLastToken(node));
+            },
+            SwitchStatement(node) {
+                const closingCurly = sourceCode.getLastToken(node);
+                const openingCurly = sourceCode.getTokenBefore(node.cases.length ? node.cases[0] : closingCurly);
+
+                validateCurlyPair(openingCurly, closingCurly);
+            },
+            IfStatement(node) {
+                if (node.consequent.type === "BlockStatement" && node.alternate) {
+
+                    // Handle the keyword after the `if` block (before `else`)
+                    validateCurlyBeforeKeyword(sourceCode.getLastToken(node.consequent));
+                }
+            },
+            TryStatement(node) {
+
+                // Handle the keyword after the `try` block (before `catch` or `finally`)
+                validateCurlyBeforeKeyword(sourceCode.getLastToken(node.block));
+
+                if (node.handler && node.finalizer) {
+
+                    // Handle the keyword after the `catch` block (before `finally`)
+                    validateCurlyBeforeKeyword(sourceCode.getLastToken(node.handler.body));
+                }
+            }
+        };
+    }
+};

node_modules/eslint/lib/rules/callback-return.js

@@ -0,0 +1,186 @@
+/**
+ * @fileoverview Enforce return after a callback.
+ * @author Jamund Ferguson
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        deprecated: true,
+
+        replacedBy: [],
+
+        type: "suggestion",
+
+        docs: {
+            description: "require `return` statements after callbacks",
+            category: "Node.js and CommonJS",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/callback-return"
+        },
+
+        schema: [{
+            type: "array",
+            items: { type: "string" }
+        }],
+
+        messages: {
+            missingReturn: "Expected return with your callback function."
+        }
+    },
+
+    create(context) {
+
+        const callbacks = context.options[0] || ["callback", "cb", "next"],
+            sourceCode = context.getSourceCode();
+
+        //--------------------------------------------------------------------------
+        // Helpers
+        //--------------------------------------------------------------------------
+
+        /**
+         * Find the closest parent matching a list of types.
+         * @param {ASTNode} node The node whose parents we are searching
+         * @param {Array} types The node types to match
+         * @returns {ASTNode} The matched node or undefined.
+         */
+        function findClosestParentOfType(node, types) {
+            if (!node.parent) {
+                return null;
+            }
+            if (types.indexOf(node.parent.type) === -1) {
+                return findClosestParentOfType(node.parent, types);
+            }
+            return node.parent;
+        }
+
+        /**
+         * Check to see if a node contains only identifiers
+         * @param {ASTNode} node The node to check
+         * @returns {boolean} Whether or not the node contains only identifiers
+         */
+        function containsOnlyIdentifiers(node) {
+            if (node.type === "Identifier") {
+                return true;
+            }
+
+            if (node.type === "MemberExpression") {
+                if (node.object.type === "Identifier") {
+                    return true;
+                }
+                if (node.object.type === "MemberExpression") {
+                    return containsOnlyIdentifiers(node.object);
+                }
+            }
+
+            return false;
+        }
+
+        /**
+         * Check to see if a CallExpression is in our callback list.
+         * @param {ASTNode} node The node to check against our callback names list.
+         * @returns {boolean} Whether or not this function matches our callback name.
+         */
+        function isCallback(node) {
+            return containsOnlyIdentifiers(node.callee) && callbacks.indexOf(sourceCode.getText(node.callee)) > -1;
+        }
+
+        /**
+         * Determines whether or not the callback is part of a callback expression.
+         * @param {ASTNode} node The callback node
+         * @param {ASTNode} parentNode The expression node
+         * @returns {boolean} Whether or not this is part of a callback expression
+         */
+        function isCallbackExpression(node, parentNode) {
+
+            // ensure the parent node exists and is an expression
+            if (!parentNode || parentNode.type !== "ExpressionStatement") {
+                return false;
+            }
+
+            // cb()
+            if (parentNode.expression === node) {
+                return true;
+            }
+
+            // special case for cb && cb() and similar
+            if (parentNode.expression.type === "BinaryExpression" || parentNode.expression.type === "LogicalExpression") {
+                if (parentNode.expression.right === node) {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+            CallExpression(node) {
+
+                // if we're not a callback we can return
+                if (!isCallback(node)) {
+                    return;
+                }
+
+                // find the closest block, return or loop
+                const closestBlock = findClosestParentOfType(node, ["BlockStatement", "ReturnStatement", "ArrowFunctionExpression"]) || {};
+
+                // if our parent is a return we know we're ok
+                if (closestBlock.type === "ReturnStatement") {
+                    return;
+                }
+
+                // arrow functions don't always have blocks and implicitly return
+                if (closestBlock.type === "ArrowFunctionExpression") {
+                    return;
+                }
+
+                // block statements are part of functions and most if statements
+                if (closestBlock.type === "BlockStatement") {
+
+                    // find the last item in the block
+                    const lastItem = closestBlock.body[closestBlock.body.length - 1];
+
+                    // if the callback is the last thing in a block that might be ok
+                    if (isCallbackExpression(node, lastItem)) {
+
+                        const parentType = closestBlock.parent.type;
+
+                        // but only if the block is part of a function
+                        if (parentType === "FunctionExpression" ||
+                            parentType === "FunctionDeclaration" ||
+                            parentType === "ArrowFunctionExpression"
+                        ) {
+                            return;
+                        }
+
+                    }
+
+                    // ending a block with a return is also ok
+                    if (lastItem.type === "ReturnStatement") {
+
+                        // but only if the callback is immediately before
+                        if (isCallbackExpression(node, closestBlock.body[closestBlock.body.length - 2])) {
+                            return;
+                        }
+                    }
+
+                }
+
+                // as long as you're the child of a function at this point you should be asked to return
+                if (findClosestParentOfType(node, ["FunctionDeclaration", "FunctionExpression", "ArrowFunctionExpression"])) {
+                    context.report({ node, messageId: "missingReturn" });
+                }
+
+            }
+
+        };
+    }
+};

node_modules/eslint/lib/rules/camelcase.js

@@ -0,0 +1,325 @@
+/**
+ * @fileoverview Rule to flag non-camelcased identifiers
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "enforce camelcase naming convention",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/camelcase"
+        },
+
+        schema: [
+            {
+                type: "object",
+                properties: {
+                    ignoreDestructuring: {
+                        type: "boolean",
+                        default: false
+                    },
+                    ignoreImports: {
+                        type: "boolean",
+                        default: false
+                    },
+                    ignoreGlobals: {
+                        type: "boolean",
+                        default: false
+                    },
+                    properties: {
+                        enum: ["always", "never"]
+                    },
+                    allow: {
+                        type: "array",
+                        items: [
+                            {
+                                type: "string"
+                            }
+                        ],
+                        minItems: 0,
+                        uniqueItems: true
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+
+        messages: {
+            notCamelCase: "Identifier '{{name}}' is not in camel case."
+        }
+    },
+
+    create(context) {
+
+        const options = context.options[0] || {};
+        let properties = options.properties || "";
+        const ignoreDestructuring = options.ignoreDestructuring;
+        const ignoreImports = options.ignoreImports;
+        const ignoreGlobals = options.ignoreGlobals;
+        const allow = options.allow || [];
+
+        let globalScope;
+
+        if (properties !== "always" && properties !== "never") {
+            properties = "always";
+        }
+
+        //--------------------------------------------------------------------------
+        // Helpers
+        //--------------------------------------------------------------------------
+
+        // contains reported nodes to avoid reporting twice on destructuring with shorthand notation
+        const reported = [];
+        const ALLOWED_PARENT_TYPES = new Set(["CallExpression", "NewExpression"]);
+
+        /**
+         * Checks if a string contains an underscore and isn't all upper-case
+         * @param {string} name The string to check.
+         * @returns {boolean} if the string is underscored
+         * @private
+         */
+        function isUnderscored(name) {
+
+            // if there's an underscore, it might be A_CONSTANT, which is okay
+            return name.includes("_") && name !== name.toUpperCase();
+        }
+
+        /**
+         * Checks if a string match the ignore list
+         * @param {string} name The string to check.
+         * @returns {boolean} if the string is ignored
+         * @private
+         */
+        function isAllowed(name) {
+            return allow.some(
+                entry => name === entry || name.match(new RegExp(entry, "u"))
+            );
+        }
+
+        /**
+         * Checks if a parent of a node is an ObjectPattern.
+         * @param {ASTNode} node The node to check.
+         * @returns {boolean} if the node is inside an ObjectPattern
+         * @private
+         */
+        function isInsideObjectPattern(node) {
+            let current = node;
+
+            while (current) {
+                const parent = current.parent;
+
+                if (parent && parent.type === "Property" && parent.computed && parent.key === current) {
+                    return false;
+                }
+
+                if (current.type === "ObjectPattern") {
+                    return true;
+                }
+
+                current = parent;
+            }
+
+            return false;
+        }
+
+        /**
+         * Checks whether the given node represents assignment target property in destructuring.
+         *
+         * For examples:
+         *    ({a: b.foo} = c);  // => true for `foo`
+         *    ([a.foo] = b);     // => true for `foo`
+         *    ([a.foo = 1] = b); // => true for `foo`
+         *    ({...a.foo} = b);  // => true for `foo`
+         * @param {ASTNode} node An Identifier node to check
+         * @returns {boolean} True if the node is an assignment target property in destructuring.
+         */
+        function isAssignmentTargetPropertyInDestructuring(node) {
+            if (
+                node.parent.type === "MemberExpression" &&
+                node.parent.property === node &&
+                !node.parent.computed
+            ) {
+                const effectiveParent = node.parent.parent;
+
+                return (
+                    effectiveParent.type === "Property" &&
+                    effectiveParent.value === node.parent &&
+                    effectiveParent.parent.type === "ObjectPattern" ||
+                    effectiveParent.type === "ArrayPattern" ||
+                    effectiveParent.type === "RestElement" ||
+                    (
+                        effectiveParent.type === "AssignmentPattern" &&
+                        effectiveParent.left === node.parent
+                    )
+                );
+            }
+            return false;
+        }
+
+        /**
+         * Checks whether the given node represents a reference to a global variable that is not declared in the source code.
+         * These identifiers will be allowed, as it is assumed that user has no control over the names of external global variables.
+         * @param {ASTNode} node `Identifier` node to check.
+         * @returns {boolean} `true` if the node is a reference to a global variable.
+         */
+        function isReferenceToGlobalVariable(node) {
+            const variable = globalScope.set.get(node.name);
+
+            return variable && variable.defs.length === 0 &&
+                variable.references.some(ref => ref.identifier === node);
+        }
+
+        /**
+         * Checks whether the given node represents a reference to a property of an object in an object literal expression.
+         * This allows to differentiate between a global variable that is allowed to be used as a reference, and the key
+         * of the expressed object (which shouldn't be allowed).
+         * @param {ASTNode} node `Identifier` node to check.
+         * @returns {boolean} `true` if the node is a property name of an object literal expression
+         */
+        function isPropertyNameInObjectLiteral(node) {
+            const parent = node.parent;
+
+            return (
+                parent.type === "Property" &&
+                parent.parent.type === "ObjectExpression" &&
+                !parent.computed &&
+                parent.key === node
+            );
+        }
+
+        /**
+         * Reports an AST node as a rule violation.
+         * @param {ASTNode} node The node to report.
+         * @returns {void}
+         * @private
+         */
+        function report(node) {
+            if (!reported.includes(node)) {
+                reported.push(node);
+                context.report({ node, messageId: "notCamelCase", data: { name: node.name } });
+            }
+        }
+
+        return {
+
+            Program() {
+                globalScope = context.getScope();
+            },
+
+            Identifier(node) {
+
+                /*
+                 * Leading and trailing underscores are commonly used to flag
+                 * private/protected identifiers, strip them before checking if underscored
+                 */
+                const name = node.name,
+                    nameIsUnderscored = isUnderscored(name.replace(/^_+|_+$/gu, "")),
+                    effectiveParent = (node.parent.type === "MemberExpression") ? node.parent.parent : node.parent;
+
+                // First, we ignore the node if it match the ignore list
+                if (isAllowed(name)) {
+                    return;
+                }
+
+                // Check if it's a global variable
+                if (ignoreGlobals && isReferenceToGlobalVariable(node) && !isPropertyNameInObjectLiteral(node)) {
+                    return;
+                }
+
+                // MemberExpressions get special rules
+                if (node.parent.type === "MemberExpression") {
+
+                    // "never" check properties
+                    if (properties === "never") {
+                        return;
+                    }
+
+                    // Always report underscored object names
+                    if (node.parent.object.type === "Identifier" && node.parent.object.name === node.name && nameIsUnderscored) {
+                        report(node);
+
+                    // Report AssignmentExpressions only if they are the left side of the assignment
+                    } else if (effectiveParent.type === "AssignmentExpression" && nameIsUnderscored && (effectiveParent.right.type !== "MemberExpression" || effectiveParent.left.type === "MemberExpression" && effectiveParent.left.property.name === node.name)) {
+                        report(node);
+
+                    } else if (isAssignmentTargetPropertyInDestructuring(node) && nameIsUnderscored) {
+                        report(node);
+                    }
+
+                /*
+                 * Properties have their own rules, and
+                 * AssignmentPattern nodes can be treated like Properties:
+                 * e.g.: const { no_camelcased = false } = bar;
+                 */
+                } else if (node.parent.type === "Property" || node.parent.type === "AssignmentPattern") {
+
+                    if (node.parent.parent && node.parent.parent.type === "ObjectPattern") {
+                        if (node.parent.shorthand && node.parent.value.left && nameIsUnderscored) {
+                            report(node);
+                        }
+
+                        const assignmentKeyEqualsValue = node.parent.key.name === node.parent.value.name;
+
+                        if (nameIsUnderscored && node.parent.computed) {
+                            report(node);
+                        }
+
+                        // prevent checking righthand side of destructured object
+                        if (node.parent.key === node && node.parent.value !== node) {
+                            return;
+                        }
+
+                        const valueIsUnderscored = node.parent.value.name && nameIsUnderscored;
+
+                        // ignore destructuring if the option is set, unless a new identifier is created
+                        if (valueIsUnderscored && !(assignmentKeyEqualsValue && ignoreDestructuring)) {
+                            report(node);
+                        }
+                    }
+
+                    // "never" check properties or always ignore destructuring
+                    if (properties === "never" || (ignoreDestructuring && isInsideObjectPattern(node))) {
+                        return;
+                    }
+
+                    // don't check right hand side of AssignmentExpression to prevent duplicate warnings
+                    if (nameIsUnderscored && !ALLOWED_PARENT_TYPES.has(effectiveParent.type) && !(node.parent.right === node)) {
+                        report(node);
+                    }
+
+                // Check if it's an import specifier
+                } else if (["ImportSpecifier", "ImportNamespaceSpecifier", "ImportDefaultSpecifier"].includes(node.parent.type)) {
+
+                    if (node.parent.type === "ImportSpecifier" && ignoreImports) {
+                        return;
+                    }
+
+                    // Report only if the local imported identifier is underscored
+                    if (
+                        node.parent.local &&
+                        node.parent.local.name === node.name &&
+                        nameIsUnderscored
+                    ) {
+                        report(node);
+                    }
+
+                // Report anything that is underscored that isn't a CallExpression
+                } else if (nameIsUnderscored && !ALLOWED_PARENT_TYPES.has(effectiveParent.type)) {
+                    report(node);
+                }
+            }
+
+        };
+
+    }
+};

node_modules/eslint/lib/rules/capitalized-comments.js

@@ -0,0 +1,300 @@
+/**
+ * @fileoverview enforce or disallow capitalization of the first letter of a comment
+ * @author Kevin Partington
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const LETTER_PATTERN = require("./utils/patterns/letters");
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+const DEFAULT_IGNORE_PATTERN = astUtils.COMMENTS_IGNORE_PATTERN,
+    WHITESPACE = /\s/gu,
+    MAYBE_URL = /^\s*[^:/?#\s]+:\/\/[^?#]/u; // TODO: Combine w/ max-len pattern?
+
+/*
+ * Base schema body for defining the basic capitalization rule, ignorePattern,
+ * and ignoreInlineComments values.
+ * This can be used in a few different ways in the actual schema.
+ */
+const SCHEMA_BODY = {
+    type: "object",
+    properties: {
+        ignorePattern: {
+            type: "string"
+        },
+        ignoreInlineComments: {
+            type: "boolean"
+        },
+        ignoreConsecutiveComments: {
+            type: "boolean"
+        }
+    },
+    additionalProperties: false
+};
+const DEFAULTS = {
+    ignorePattern: "",
+    ignoreInlineComments: false,
+    ignoreConsecutiveComments: false
+};
+
+/**
+ * Get normalized options for either block or line comments from the given
+ * user-provided options.
+ * - If the user-provided options is just a string, returns a normalized
+ *   set of options using default values for all other options.
+ * - If the user-provided options is an object, then a normalized option
+ *   set is returned. Options specified in overrides will take priority
+ *   over options specified in the main options object, which will in
+ *   turn take priority over the rule's defaults.
+ * @param {Object|string} rawOptions The user-provided options.
+ * @param {string} which Either "line" or "block".
+ * @returns {Object} The normalized options.
+ */
+function getNormalizedOptions(rawOptions, which) {
+    return Object.assign({}, DEFAULTS, rawOptions[which] || rawOptions);
+}
+
+/**
+ * Get normalized options for block and line comments.
+ * @param {Object|string} rawOptions The user-provided options.
+ * @returns {Object} An object with "Line" and "Block" keys and corresponding
+ * normalized options objects.
+ */
+function getAllNormalizedOptions(rawOptions = {}) {
+    return {
+        Line: getNormalizedOptions(rawOptions, "line"),
+        Block: getNormalizedOptions(rawOptions, "block")
+    };
+}
+
+/**
+ * Creates a regular expression for each ignorePattern defined in the rule
+ * options.
+ *
+ * This is done in order to avoid invoking the RegExp constructor repeatedly.
+ * @param {Object} normalizedOptions The normalized rule options.
+ * @returns {void}
+ */
+function createRegExpForIgnorePatterns(normalizedOptions) {
+    Object.keys(normalizedOptions).forEach(key => {
+        const ignorePatternStr = normalizedOptions[key].ignorePattern;
+
+        if (ignorePatternStr) {
+            const regExp = RegExp(`^\\s*(?:${ignorePatternStr})`, "u");
+
+            normalizedOptions[key].ignorePatternRegExp = regExp;
+        }
+    });
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "enforce or disallow capitalization of the first letter of a comment",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/capitalized-comments"
+        },
+
+        fixable: "code",
+
+        schema: [
+            { enum: ["always", "never"] },
+            {
+                oneOf: [
+                    SCHEMA_BODY,
+                    {
+                        type: "object",
+                        properties: {
+                            line: SCHEMA_BODY,
+                            block: SCHEMA_BODY
+                        },
+                        additionalProperties: false
+                    }
+                ]
+            }
+        ],
+
+        messages: {
+            unexpectedLowercaseComment: "Comments should not begin with a lowercase character.",
+            unexpectedUppercaseComment: "Comments should not begin with an uppercase character."
+        }
+    },
+
+    create(context) {
+
+        const capitalize = context.options[0] || "always",
+            normalizedOptions = getAllNormalizedOptions(context.options[1]),
+            sourceCode = context.getSourceCode();
+
+        createRegExpForIgnorePatterns(normalizedOptions);
+
+        //----------------------------------------------------------------------
+        // Helpers
+        //----------------------------------------------------------------------
+
+        /**
+         * Checks whether a comment is an inline comment.
+         *
+         * For the purpose of this rule, a comment is inline if:
+         * 1. The comment is preceded by a token on the same line; and
+         * 2. The command is followed by a token on the same line.
+         *
+         * Note that the comment itself need not be single-line!
+         *
+         * Also, it follows from this definition that only block comments can
+         * be considered as possibly inline. This is because line comments
+         * would consume any following tokens on the same line as the comment.
+         * @param {ASTNode} comment The comment node to check.
+         * @returns {boolean} True if the comment is an inline comment, false
+         * otherwise.
+         */
+        function isInlineComment(comment) {
+            const previousToken = sourceCode.getTokenBefore(comment, { includeComments: true }),
+                nextToken = sourceCode.getTokenAfter(comment, { includeComments: true });
+
+            return Boolean(
+                previousToken &&
+                nextToken &&
+                comment.loc.start.line === previousToken.loc.end.line &&
+                comment.loc.end.line === nextToken.loc.start.line
+            );
+        }
+
+        /**
+         * Determine if a comment follows another comment.
+         * @param {ASTNode} comment The comment to check.
+         * @returns {boolean} True if the comment follows a valid comment.
+         */
+        function isConsecutiveComment(comment) {
+            const previousTokenOrComment = sourceCode.getTokenBefore(comment, { includeComments: true });
+
+            return Boolean(
+                previousTokenOrComment &&
+                ["Block", "Line"].indexOf(previousTokenOrComment.type) !== -1
+            );
+        }
+
+        /**
+         * Check a comment to determine if it is valid for this rule.
+         * @param {ASTNode} comment The comment node to process.
+         * @param {Object} options The options for checking this comment.
+         * @returns {boolean} True if the comment is valid, false otherwise.
+         */
+        function isCommentValid(comment, options) {
+
+            // 1. Check for default ignore pattern.
+            if (DEFAULT_IGNORE_PATTERN.test(comment.value)) {
+                return true;
+            }
+
+            // 2. Check for custom ignore pattern.
+            const commentWithoutAsterisks = comment.value
+                .replace(/\*/gu, "");
+
+            if (options.ignorePatternRegExp && options.ignorePatternRegExp.test(commentWithoutAsterisks)) {
+                return true;
+            }
+
+            // 3. Check for inline comments.
+            if (options.ignoreInlineComments && isInlineComment(comment)) {
+                return true;
+            }
+
+            // 4. Is this a consecutive comment (and are we tolerating those)?
+            if (options.ignoreConsecutiveComments && isConsecutiveComment(comment)) {
+                return true;
+            }
+
+            // 5. Does the comment start with a possible URL?
+            if (MAYBE_URL.test(commentWithoutAsterisks)) {
+                return true;
+            }
+
+            // 6. Is the initial word character a letter?
+            const commentWordCharsOnly = commentWithoutAsterisks
+                .replace(WHITESPACE, "");
+
+            if (commentWordCharsOnly.length === 0) {
+                return true;
+            }
+
+            const firstWordChar = commentWordCharsOnly[0];
+
+            if (!LETTER_PATTERN.test(firstWordChar)) {
+                return true;
+            }
+
+            // 7. Check the case of the initial word character.
+            const isUppercase = firstWordChar !== firstWordChar.toLocaleLowerCase(),
+                isLowercase = firstWordChar !== firstWordChar.toLocaleUpperCase();
+
+            if (capitalize === "always" && isLowercase) {
+                return false;
+            }
+            if (capitalize === "never" && isUppercase) {
+                return false;
+            }
+
+            return true;
+        }
+
+        /**
+         * Process a comment to determine if it needs to be reported.
+         * @param {ASTNode} comment The comment node to process.
+         * @returns {void}
+         */
+        function processComment(comment) {
+            const options = normalizedOptions[comment.type],
+                commentValid = isCommentValid(comment, options);
+
+            if (!commentValid) {
+                const messageId = capitalize === "always"
+                    ? "unexpectedLowercaseComment"
+                    : "unexpectedUppercaseComment";
+
+                context.report({
+                    node: null, // Intentionally using loc instead
+                    loc: comment.loc,
+                    messageId,
+                    fix(fixer) {
+                        const match = comment.value.match(LETTER_PATTERN);
+
+                        return fixer.replaceTextRange(
+
+                            // Offset match.index by 2 to account for the first 2 characters that start the comment (// or /*)
+                            [comment.range[0] + match.index + 2, comment.range[0] + match.index + 3],
+                            capitalize === "always" ? match[0].toLocaleUpperCase() : match[0].toLocaleLowerCase()
+                        );
+                    }
+                });
+            }
+        }
+
+        //----------------------------------------------------------------------
+        // Public
+        //----------------------------------------------------------------------
+
+        return {
+            Program() {
+                const comments = sourceCode.getAllComments();
+
+                comments.filter(token => token.type !== "Shebang").forEach(processComment);
+            }
+        };
+    }
+};

node_modules/eslint/lib/rules/class-methods-use-this.js

@@ -0,0 +1,125 @@
+/**
+ * @fileoverview Rule to enforce that all class methods use 'this'.
+ * @author Patrick Williams
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "enforce that class methods utilize `this`",
+            category: "Best Practices",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/class-methods-use-this"
+        },
+
+        schema: [{
+            type: "object",
+            properties: {
+                exceptMethods: {
+                    type: "array",
+                    items: {
+                        type: "string"
+                    }
+                }
+            },
+            additionalProperties: false
+        }],
+
+        messages: {
+            missingThis: "Expected 'this' to be used by class {{name}}."
+        }
+    },
+    create(context) {
+        const config = Object.assign({}, context.options[0]);
+        const exceptMethods = new Set(config.exceptMethods || []);
+
+        const stack = [];
+
+        /**
+         * Initializes the current context to false and pushes it onto the stack.
+         * These booleans represent whether 'this' has been used in the context.
+         * @returns {void}
+         * @private
+         */
+        function enterFunction() {
+            stack.push(false);
+        }
+
+        /**
+         * Check if the node is an instance method
+         * @param {ASTNode} node node to check
+         * @returns {boolean} True if its an instance method
+         * @private
+         */
+        function isInstanceMethod(node) {
+            return !node.static && node.kind !== "constructor" && node.type === "MethodDefinition";
+        }
+
+        /**
+         * Check if the node is an instance method not excluded by config
+         * @param {ASTNode} node node to check
+         * @returns {boolean} True if it is an instance method, and not excluded by config
+         * @private
+         */
+        function isIncludedInstanceMethod(node) {
+            return isInstanceMethod(node) &&
+                (node.computed || !exceptMethods.has(node.key.name));
+        }
+
+        /**
+         * Checks if we are leaving a function that is a method, and reports if 'this' has not been used.
+         * Static methods and the constructor are exempt.
+         * Then pops the context off the stack.
+         * @param {ASTNode} node A function node that was entered.
+         * @returns {void}
+         * @private
+         */
+        function exitFunction(node) {
+            const methodUsesThis = stack.pop();
+
+            if (isIncludedInstanceMethod(node.parent) && !methodUsesThis) {
+                context.report({
+                    node,
+                    messageId: "missingThis",
+                    data: {
+                        name: astUtils.getFunctionNameWithKind(node)
+                    }
+                });
+            }
+        }
+
+        /**
+         * Mark the current context as having used 'this'.
+         * @returns {void}
+         * @private
+         */
+        function markThisUsed() {
+            if (stack.length) {
+                stack[stack.length - 1] = true;
+            }
+        }
+
+        return {
+            FunctionDeclaration: enterFunction,
+            "FunctionDeclaration:exit": exitFunction,
+            FunctionExpression: enterFunction,
+            "FunctionExpression:exit": exitFunction,
+            ThisExpression: markThisUsed,
+            Super: markThisUsed
+        };
+    }
+};

node_modules/eslint/lib/rules/comma-dangle.js

@@ -0,0 +1,349 @@
+/**
+ * @fileoverview Rule to forbid or enforce dangling commas.
+ * @author Ian Christian Myers
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+const DEFAULT_OPTIONS = Object.freeze({
+    arrays: "never",
+    objects: "never",
+    imports: "never",
+    exports: "never",
+    functions: "never"
+});
+
+/**
+ * Checks whether or not a trailing comma is allowed in a given node.
+ * If the `lastItem` is `RestElement` or `RestProperty`, it disallows trailing commas.
+ * @param {ASTNode} lastItem The node of the last element in the given node.
+ * @returns {boolean} `true` if a trailing comma is allowed.
+ */
+function isTrailingCommaAllowed(lastItem) {
+    return !(
+        lastItem.type === "RestElement" ||
+        lastItem.type === "RestProperty" ||
+        lastItem.type === "ExperimentalRestProperty"
+    );
+}
+
+/**
+ * Normalize option value.
+ * @param {string|Object|undefined} optionValue The 1st option value to normalize.
+ * @param {number} ecmaVersion The normalized ECMAScript version.
+ * @returns {Object} The normalized option value.
+ */
+function normalizeOptions(optionValue, ecmaVersion) {
+    if (typeof optionValue === "string") {
+        return {
+            arrays: optionValue,
+            objects: optionValue,
+            imports: optionValue,
+            exports: optionValue,
+            functions: (!ecmaVersion || ecmaVersion < 8) ? "ignore" : optionValue
+        };
+    }
+    if (typeof optionValue === "object" && optionValue !== null) {
+        return {
+            arrays: optionValue.arrays || DEFAULT_OPTIONS.arrays,
+            objects: optionValue.objects || DEFAULT_OPTIONS.objects,
+            imports: optionValue.imports || DEFAULT_OPTIONS.imports,
+            exports: optionValue.exports || DEFAULT_OPTIONS.exports,
+            functions: optionValue.functions || DEFAULT_OPTIONS.functions
+        };
+    }
+
+    return DEFAULT_OPTIONS;
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "require or disallow trailing commas",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/comma-dangle"
+        },
+
+        fixable: "code",
+
+        schema: {
+            definitions: {
+                value: {
+                    enum: [
+                        "always-multiline",
+                        "always",
+                        "never",
+                        "only-multiline"
+                    ]
+                },
+                valueWithIgnore: {
+                    enum: [
+                        "always-multiline",
+                        "always",
+                        "ignore",
+                        "never",
+                        "only-multiline"
+                    ]
+                }
+            },
+            type: "array",
+            items: [
+                {
+                    oneOf: [
+                        {
+                            $ref: "#/definitions/value"
+                        },
+                        {
+                            type: "object",
+                            properties: {
+                                arrays: { $ref: "#/definitions/valueWithIgnore" },
+                                objects: { $ref: "#/definitions/valueWithIgnore" },
+                                imports: { $ref: "#/definitions/valueWithIgnore" },
+                                exports: { $ref: "#/definitions/valueWithIgnore" },
+                                functions: { $ref: "#/definitions/valueWithIgnore" }
+                            },
+                            additionalProperties: false
+                        }
+                    ]
+                }
+            ]
+        },
+
+        messages: {
+            unexpected: "Unexpected trailing comma.",
+            missing: "Missing trailing comma."
+        }
+    },
+
+    create(context) {
+        const options = normalizeOptions(context.options[0], context.parserOptions.ecmaVersion);
+
+        const sourceCode = context.getSourceCode();
+
+        /**
+         * Gets the last item of the given node.
+         * @param {ASTNode} node The node to get.
+         * @returns {ASTNode|null} The last node or null.
+         */
+        function getLastItem(node) {
+
+            /**
+             * Returns the last element of an array
+             * @param {any[]} array The input array
+             * @returns {any} The last element
+             */
+            function last(array) {
+                return array[array.length - 1];
+            }
+
+            switch (node.type) {
+                case "ObjectExpression":
+                case "ObjectPattern":
+                    return last(node.properties);
+                case "ArrayExpression":
+                case "ArrayPattern":
+                    return last(node.elements);
+                case "ImportDeclaration":
+                case "ExportNamedDeclaration":
+                    return last(node.specifiers);
+                case "FunctionDeclaration":
+                case "FunctionExpression":
+                case "ArrowFunctionExpression":
+                    return last(node.params);
+                case "CallExpression":
+                case "NewExpression":
+                    return last(node.arguments);
+                default:
+                    return null;
+            }
+        }
+
+        /**
+         * Gets the trailing comma token of the given node.
+         * If the trailing comma does not exist, this returns the token which is
+         * the insertion point of the trailing comma token.
+         * @param {ASTNode} node The node to get.
+         * @param {ASTNode} lastItem The last item of the node.
+         * @returns {Token} The trailing comma token or the insertion point.
+         */
+        function getTrailingToken(node, lastItem) {
+            switch (node.type) {
+                case "ObjectExpression":
+                case "ArrayExpression":
+                case "CallExpression":
+                case "NewExpression":
+                    return sourceCode.getLastToken(node, 1);
+                default: {
+                    const nextToken = sourceCode.getTokenAfter(lastItem);
+
+                    if (astUtils.isCommaToken(nextToken)) {
+                        return nextToken;
+                    }
+                    return sourceCode.getLastToken(lastItem);
+                }
+            }
+        }
+
+        /**
+         * Checks whether or not a given node is multiline.
+         * This rule handles a given node as multiline when the closing parenthesis
+         * and the last element are not on the same line.
+         * @param {ASTNode} node A node to check.
+         * @returns {boolean} `true` if the node is multiline.
+         */
+        function isMultiline(node) {
+            const lastItem = getLastItem(node);
+
+            if (!lastItem) {
+                return false;
+            }
+
+            const penultimateToken = getTrailingToken(node, lastItem);
+            const lastToken = sourceCode.getTokenAfter(penultimateToken);
+
+            return lastToken.loc.end.line !== penultimateToken.loc.end.line;
+        }
+
+        /**
+         * Reports a trailing comma if it exists.
+         * @param {ASTNode} node A node to check. Its type is one of
+         *   ObjectExpression, ObjectPattern, ArrayExpression, ArrayPattern,
+         *   ImportDeclaration, and ExportNamedDeclaration.
+         * @returns {void}
+         */
+        function forbidTrailingComma(node) {
+            const lastItem = getLastItem(node);
+
+            if (!lastItem || (node.type === "ImportDeclaration" && lastItem.type !== "ImportSpecifier")) {
+                return;
+            }
+
+            const trailingToken = getTrailingToken(node, lastItem);
+
+            if (astUtils.isCommaToken(trailingToken)) {
+                context.report({
+                    node: lastItem,
+                    loc: trailingToken.loc,
+                    messageId: "unexpected",
+                    fix(fixer) {
+                        return fixer.remove(trailingToken);
+                    }
+                });
+            }
+        }
+
+        /**
+         * Reports the last element of a given node if it does not have a trailing
+         * comma.
+         *
+         * If a given node is `ArrayPattern` which has `RestElement`, the trailing
+         * comma is disallowed, so report if it exists.
+         * @param {ASTNode} node A node to check. Its type is one of
+         *   ObjectExpression, ObjectPattern, ArrayExpression, ArrayPattern,
+         *   ImportDeclaration, and ExportNamedDeclaration.
+         * @returns {void}
+         */
+        function forceTrailingComma(node) {
+            const lastItem = getLastItem(node);
+
+            if (!lastItem || (node.type === "ImportDeclaration" && lastItem.type !== "ImportSpecifier")) {
+                return;
+            }
+            if (!isTrailingCommaAllowed(lastItem)) {
+                forbidTrailingComma(node);
+                return;
+            }
+
+            const trailingToken = getTrailingToken(node, lastItem);
+
+            if (trailingToken.value !== ",") {
+                context.report({
+                    node: lastItem,
+                    loc: {
+                        start: trailingToken.loc.end,
+                        end: astUtils.getNextLocation(sourceCode, trailingToken.loc.end)
+                    },
+                    messageId: "missing",
+                    fix(fixer) {
+                        return fixer.insertTextAfter(trailingToken, ",");
+                    }
+                });
+            }
+        }
+
+        /**
+         * If a given node is multiline, reports the last element of a given node
+         * when it does not have a trailing comma.
+         * Otherwise, reports a trailing comma if it exists.
+         * @param {ASTNode} node A node to check. Its type is one of
+         *   ObjectExpression, ObjectPattern, ArrayExpression, ArrayPattern,
+         *   ImportDeclaration, and ExportNamedDeclaration.
+         * @returns {void}
+         */
+        function forceTrailingCommaIfMultiline(node) {
+            if (isMultiline(node)) {
+                forceTrailingComma(node);
+            } else {
+                forbidTrailingComma(node);
+            }
+        }
+
+        /**
+         * Only if a given node is not multiline, reports the last element of a given node
+         * when it does not have a trailing comma.
+         * Otherwise, reports a trailing comma if it exists.
+         * @param {ASTNode} node A node to check. Its type is one of
+         *   ObjectExpression, ObjectPattern, ArrayExpression, ArrayPattern,
+         *   ImportDeclaration, and ExportNamedDeclaration.
+         * @returns {void}
+         */
+        function allowTrailingCommaIfMultiline(node) {
+            if (!isMultiline(node)) {
+                forbidTrailingComma(node);
+            }
+        }
+
+        const predicate = {
+            always: forceTrailingComma,
+            "always-multiline": forceTrailingCommaIfMultiline,
+            "only-multiline": allowTrailingCommaIfMultiline,
+            never: forbidTrailingComma,
+            ignore: () => {}
+        };
+
+        return {
+            ObjectExpression: predicate[options.objects],
+            ObjectPattern: predicate[options.objects],
+
+            ArrayExpression: predicate[options.arrays],
+            ArrayPattern: predicate[options.arrays],
+
+            ImportDeclaration: predicate[options.imports],
+
+            ExportNamedDeclaration: predicate[options.exports],
+
+            FunctionDeclaration: predicate[options.functions],
+            FunctionExpression: predicate[options.functions],
+            ArrowFunctionExpression: predicate[options.functions],
+            CallExpression: predicate[options.functions],
+            NewExpression: predicate[options.functions]
+        };
+    }
+};

node_modules/eslint/lib/rules/comma-spacing.js

@@ -0,0 +1,195 @@
+/**
+ * @fileoverview Comma spacing - validates spacing before and after comma
+ * @author Vignesh Anand aka vegetableman.
+ */
+"use strict";
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce consistent spacing before and after commas",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/comma-spacing"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                type: "object",
+                properties: {
+                    before: {
+                        type: "boolean",
+                        default: false
+                    },
+                    after: {
+                        type: "boolean",
+                        default: true
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+
+        messages: {
+            missing: "A space is required {{loc}} ','.",
+            unexpected: "There should be no space {{loc}} ','."
+        }
+    },
+
+    create(context) {
+
+        const sourceCode = context.getSourceCode();
+        const tokensAndComments = sourceCode.tokensAndComments;
+
+        const options = {
+            before: context.options[0] ? context.options[0].before : false,
+            after: context.options[0] ? context.options[0].after : true
+        };
+
+        //--------------------------------------------------------------------------
+        // Helpers
+        //--------------------------------------------------------------------------
+
+        // list of comma tokens to ignore for the check of leading whitespace
+        const commaTokensToIgnore = [];
+
+        /**
+         * Reports a spacing error with an appropriate message.
+         * @param {ASTNode} node The binary expression node to report.
+         * @param {string} loc Is the error "before" or "after" the comma?
+         * @param {ASTNode} otherNode The node at the left or right of `node`
+         * @returns {void}
+         * @private
+         */
+        function report(node, loc, otherNode) {
+            context.report({
+                node,
+                fix(fixer) {
+                    if (options[loc]) {
+                        if (loc === "before") {
+                            return fixer.insertTextBefore(node, " ");
+                        }
+                        return fixer.insertTextAfter(node, " ");
+
+                    }
+                    let start, end;
+                    const newText = "";
+
+                    if (loc === "before") {
+                        start = otherNode.range[1];
+                        end = node.range[0];
+                    } else {
+                        start = node.range[1];
+                        end = otherNode.range[0];
+                    }
+
+                    return fixer.replaceTextRange([start, end], newText);
+
+                },
+                messageId: options[loc] ? "missing" : "unexpected",
+                data: {
+                    loc
+                }
+            });
+        }
+
+        /**
+         * Validates the spacing around a comma token.
+         * @param {Object} tokens The tokens to be validated.
+         * @param {Token} tokens.comma The token representing the comma.
+         * @param {Token} [tokens.left] The last token before the comma.
+         * @param {Token} [tokens.right] The first token after the comma.
+         * @param {Token|ASTNode} reportItem The item to use when reporting an error.
+         * @returns {void}
+         * @private
+         */
+        function validateCommaItemSpacing(tokens, reportItem) {
+            if (tokens.left && astUtils.isTokenOnSameLine(tokens.left, tokens.comma) &&
+                    (options.before !== sourceCode.isSpaceBetweenTokens(tokens.left, tokens.comma))
+            ) {
+                report(reportItem, "before", tokens.left);
+            }
+
+            if (tokens.right && astUtils.isClosingParenToken(tokens.right)) {
+                return;
+            }
+
+            if (tokens.right && !options.after && tokens.right.type === "Line") {
+                return;
+            }
+
+            if (tokens.right && astUtils.isTokenOnSameLine(tokens.comma, tokens.right) &&
+                    (options.after !== sourceCode.isSpaceBetweenTokens(tokens.comma, tokens.right))
+            ) {
+                report(reportItem, "after", tokens.right);
+            }
+        }
+
+        /**
+         * Adds null elements of the given ArrayExpression or ArrayPattern node to the ignore list.
+         * @param {ASTNode} node An ArrayExpression or ArrayPattern node.
+         * @returns {void}
+         */
+        function addNullElementsToIgnoreList(node) {
+            let previousToken = sourceCode.getFirstToken(node);
+
+            node.elements.forEach(element => {
+                let token;
+
+                if (element === null) {
+                    token = sourceCode.getTokenAfter(previousToken);
+
+                    if (astUtils.isCommaToken(token)) {
+                        commaTokensToIgnore.push(token);
+                    }
+                } else {
+                    token = sourceCode.getTokenAfter(element);
+                }
+
+                previousToken = token;
+            });
+        }
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+            "Program:exit"() {
+                tokensAndComments.forEach((token, i) => {
+
+                    if (!astUtils.isCommaToken(token)) {
+                        return;
+                    }
+
+                    if (token && token.type === "JSXText") {
+                        return;
+                    }
+
+                    const previousToken = tokensAndComments[i - 1];
+                    const nextToken = tokensAndComments[i + 1];
+
+                    validateCommaItemSpacing({
+                        comma: token,
+                        left: astUtils.isCommaToken(previousToken) || commaTokensToIgnore.includes(token) ? null : previousToken,
+                        right: astUtils.isCommaToken(nextToken) ? null : nextToken
+                    }, token);
+                });
+            },
+            ArrayExpression: addNullElementsToIgnoreList,
+            ArrayPattern: addNullElementsToIgnoreList
+
+        };
+
+    }
+};

node_modules/eslint/lib/rules/comma-style.js

@@ -0,0 +1,311 @@
+/**
+ * @fileoverview Comma style - enforces comma styles of two types: last and first
+ * @author Vignesh Anand aka vegetableman
+ */
+
+"use strict";
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce consistent comma style",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/comma-style"
+        },
+
+        fixable: "code",
+
+        schema: [
+            {
+                enum: ["first", "last"]
+            },
+            {
+                type: "object",
+                properties: {
+                    exceptions: {
+                        type: "object",
+                        additionalProperties: {
+                            type: "boolean"
+                        }
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+
+        messages: {
+            unexpectedLineBeforeAndAfterComma: "Bad line breaking before and after ','.",
+            expectedCommaFirst: "',' should be placed first.",
+            expectedCommaLast: "',' should be placed last."
+        }
+    },
+
+    create(context) {
+        const style = context.options[0] || "last",
+            sourceCode = context.getSourceCode();
+        const exceptions = {
+            ArrayPattern: true,
+            ArrowFunctionExpression: true,
+            CallExpression: true,
+            FunctionDeclaration: true,
+            FunctionExpression: true,
+            ImportDeclaration: true,
+            ObjectPattern: true,
+            NewExpression: true
+        };
+
+        if (context.options.length === 2 && Object.prototype.hasOwnProperty.call(context.options[1], "exceptions")) {
+            const keys = Object.keys(context.options[1].exceptions);
+
+            for (let i = 0; i < keys.length; i++) {
+                exceptions[keys[i]] = context.options[1].exceptions[keys[i]];
+            }
+        }
+
+        //--------------------------------------------------------------------------
+        // Helpers
+        //--------------------------------------------------------------------------
+
+        /**
+         * Modified text based on the style
+         * @param {string} styleType Style type
+         * @param {string} text Source code text
+         * @returns {string} modified text
+         * @private
+         */
+        function getReplacedText(styleType, text) {
+            switch (styleType) {
+                case "between":
+                    return `,${text.replace(astUtils.LINEBREAK_MATCHER, "")}`;
+
+                case "first":
+                    return `${text},`;
+
+                case "last":
+                    return `,${text}`;
+
+                default:
+                    return "";
+            }
+        }
+
+        /**
+         * Determines the fixer function for a given style.
+         * @param {string} styleType comma style
+         * @param {ASTNode} previousItemToken The token to check.
+         * @param {ASTNode} commaToken The token to check.
+         * @param {ASTNode} currentItemToken The token to check.
+         * @returns {Function} Fixer function
+         * @private
+         */
+        function getFixerFunction(styleType, previousItemToken, commaToken, currentItemToken) {
+            const text =
+                sourceCode.text.slice(previousItemToken.range[1], commaToken.range[0]) +
+                sourceCode.text.slice(commaToken.range[1], currentItemToken.range[0]);
+            const range = [previousItemToken.range[1], currentItemToken.range[0]];
+
+            return function(fixer) {
+                return fixer.replaceTextRange(range, getReplacedText(styleType, text));
+            };
+        }
+
+        /**
+         * Validates the spacing around single items in lists.
+         * @param {Token} previousItemToken The last token from the previous item.
+         * @param {Token} commaToken The token representing the comma.
+         * @param {Token} currentItemToken The first token of the current item.
+         * @param {Token} reportItem The item to use when reporting an error.
+         * @returns {void}
+         * @private
+         */
+        function validateCommaItemSpacing(previousItemToken, commaToken, currentItemToken, reportItem) {
+
+            // if single line
+            if (astUtils.isTokenOnSameLine(commaToken, currentItemToken) &&
+                    astUtils.isTokenOnSameLine(previousItemToken, commaToken)) {
+
+                // do nothing.
+
+            } else if (!astUtils.isTokenOnSameLine(commaToken, currentItemToken) &&
+                    !astUtils.isTokenOnSameLine(previousItemToken, commaToken)) {
+
+                const comment = sourceCode.getCommentsAfter(commaToken)[0];
+                const styleType = comment && comment.type === "Block" && astUtils.isTokenOnSameLine(commaToken, comment)
+                    ? style
+                    : "between";
+
+                // lone comma
+                context.report({
+                    node: reportItem,
+                    loc: commaToken.loc,
+                    messageId: "unexpectedLineBeforeAndAfterComma",
+                    fix: getFixerFunction(styleType, previousItemToken, commaToken, currentItemToken)
+                });
+
+            } else if (style === "first" && !astUtils.isTokenOnSameLine(commaToken, currentItemToken)) {
+
+                context.report({
+                    node: reportItem,
+                    loc: commaToken.loc,
+                    messageId: "expectedCommaFirst",
+                    fix: getFixerFunction(style, previousItemToken, commaToken, currentItemToken)
+                });
+
+            } else if (style === "last" && astUtils.isTokenOnSameLine(commaToken, currentItemToken)) {
+
+                context.report({
+                    node: reportItem,
+                    loc: commaToken.loc,
+                    messageId: "expectedCommaLast",
+                    fix: getFixerFunction(style, previousItemToken, commaToken, currentItemToken)
+                });
+            }
+        }
+
+        /**
+         * Checks the comma placement with regards to a declaration/property/element
+         * @param {ASTNode} node The binary expression node to check
+         * @param {string} property The property of the node containing child nodes.
+         * @private
+         * @returns {void}
+         */
+        function validateComma(node, property) {
+            const items = node[property],
+                arrayLiteral = (node.type === "ArrayExpression" || node.type === "ArrayPattern");
+
+            if (items.length > 1 || arrayLiteral) {
+
+                // seed as opening [
+                let previousItemToken = sourceCode.getFirstToken(node);
+
+                items.forEach(item => {
+                    const commaToken = item ? sourceCode.getTokenBefore(item) : previousItemToken,
+                        currentItemToken = item ? sourceCode.getFirstToken(item) : sourceCode.getTokenAfter(commaToken),
+                        reportItem = item || currentItemToken;
+
+                    /*
+                     * This works by comparing three token locations:
+                     * - previousItemToken is the last token of the previous item
+                     * - commaToken is the location of the comma before the current item
+                     * - currentItemToken is the first token of the current item
+                     *
+                     * These values get switched around if item is undefined.
+                     * previousItemToken will refer to the last token not belonging
+                     * to the current item, which could be a comma or an opening
+                     * square bracket. currentItemToken could be a comma.
+                     *
+                     * All comparisons are done based on these tokens directly, so
+                     * they are always valid regardless of an undefined item.
+                     */
+                    if (astUtils.isCommaToken(commaToken)) {
+                        validateCommaItemSpacing(previousItemToken, commaToken, currentItemToken, reportItem);
+                    }
+
+                    if (item) {
+                        const tokenAfterItem = sourceCode.getTokenAfter(item, astUtils.isNotClosingParenToken);
+
+                        previousItemToken = tokenAfterItem
+                            ? sourceCode.getTokenBefore(tokenAfterItem)
+                            : sourceCode.ast.tokens[sourceCode.ast.tokens.length - 1];
+                    } else {
+                        previousItemToken = currentItemToken;
+                    }
+                });
+
+                /*
+                 * Special case for array literals that have empty last items, such
+                 * as [ 1, 2, ]. These arrays only have two items show up in the
+                 * AST, so we need to look at the token to verify that there's no
+                 * dangling comma.
+                 */
+                if (arrayLiteral) {
+
+                    const lastToken = sourceCode.getLastToken(node),
+                        nextToLastToken = sourceCode.getTokenBefore(lastToken);
+
+                    if (astUtils.isCommaToken(nextToLastToken)) {
+                        validateCommaItemSpacing(
+                            sourceCode.getTokenBefore(nextToLastToken),
+                            nextToLastToken,
+                            lastToken,
+                            lastToken
+                        );
+                    }
+                }
+            }
+        }
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        const nodes = {};
+
+        if (!exceptions.VariableDeclaration) {
+            nodes.VariableDeclaration = function(node) {
+                validateComma(node, "declarations");
+            };
+        }
+        if (!exceptions.ObjectExpression) {
+            nodes.ObjectExpression = function(node) {
+                validateComma(node, "properties");
+            };
+        }
+        if (!exceptions.ObjectPattern) {
+            nodes.ObjectPattern = function(node) {
+                validateComma(node, "properties");
+            };
+        }
+        if (!exceptions.ArrayExpression) {
+            nodes.ArrayExpression = function(node) {
+                validateComma(node, "elements");
+            };
+        }
+        if (!exceptions.ArrayPattern) {
+            nodes.ArrayPattern = function(node) {
+                validateComma(node, "elements");
+            };
+        }
+        if (!exceptions.FunctionDeclaration) {
+            nodes.FunctionDeclaration = function(node) {
+                validateComma(node, "params");
+            };
+        }
+        if (!exceptions.FunctionExpression) {
+            nodes.FunctionExpression = function(node) {
+                validateComma(node, "params");
+            };
+        }
+        if (!exceptions.ArrowFunctionExpression) {
+            nodes.ArrowFunctionExpression = function(node) {
+                validateComma(node, "params");
+            };
+        }
+        if (!exceptions.CallExpression) {
+            nodes.CallExpression = function(node) {
+                validateComma(node, "arguments");
+            };
+        }
+        if (!exceptions.ImportDeclaration) {
+            nodes.ImportDeclaration = function(node) {
+                validateComma(node, "specifiers");
+            };
+        }
+        if (!exceptions.NewExpression) {
+            nodes.NewExpression = function(node) {
+                validateComma(node, "arguments");
+            };
+        }
+
+        return nodes;
+    }
+};

node_modules/eslint/lib/rules/complexity.js

@@ -0,0 +1,165 @@
+/**
+ * @fileoverview Counts the cyclomatic complexity of each function of the script. See http://en.wikipedia.org/wiki/Cyclomatic_complexity.
+ * Counts the number of if, conditional, for, while, try, switch/case,
+ * @author Patrick Brosset
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+const { upperCaseFirst } = require("../shared/string-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "enforce a maximum cyclomatic complexity allowed in a program",
+            category: "Best Practices",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/complexity"
+        },
+
+        schema: [
+            {
+                oneOf: [
+                    {
+                        type: "integer",
+                        minimum: 0
+                    },
+                    {
+                        type: "object",
+                        properties: {
+                            maximum: {
+                                type: "integer",
+                                minimum: 0
+                            },
+                            max: {
+                                type: "integer",
+                                minimum: 0
+                            }
+                        },
+                        additionalProperties: false
+                    }
+                ]
+            }
+        ],
+
+        messages: {
+            complex: "{{name}} has a complexity of {{complexity}}. Maximum allowed is {{max}}."
+        }
+    },
+
+    create(context) {
+        const option = context.options[0];
+        let THRESHOLD = 20;
+
+        if (
+            typeof option === "object" &&
+            (Object.prototype.hasOwnProperty.call(option, "maximum") || Object.prototype.hasOwnProperty.call(option, "max"))
+        ) {
+            THRESHOLD = option.maximum || option.max;
+        } else if (typeof option === "number") {
+            THRESHOLD = option;
+        }
+
+        //--------------------------------------------------------------------------
+        // Helpers
+        //--------------------------------------------------------------------------
+
+        // Using a stack to store complexity (handling nested functions)
+        const fns = [];
+
+        /**
+         * When parsing a new function, store it in our function stack
+         * @returns {void}
+         * @private
+         */
+        function startFunction() {
+            fns.push(1);
+        }
+
+        /**
+         * Evaluate the node at the end of function
+         * @param {ASTNode} node node to evaluate
+         * @returns {void}
+         * @private
+         */
+        function endFunction(node) {
+            const name = upperCaseFirst(astUtils.getFunctionNameWithKind(node));
+            const complexity = fns.pop();
+
+            if (complexity > THRESHOLD) {
+                context.report({
+                    node,
+                    messageId: "complex",
+                    data: { name, complexity, max: THRESHOLD }
+                });
+            }
+        }
+
+        /**
+         * Increase the complexity of the function in context
+         * @returns {void}
+         * @private
+         */
+        function increaseComplexity() {
+            if (fns.length) {
+                fns[fns.length - 1]++;
+            }
+        }
+
+        /**
+         * Increase the switch complexity in context
+         * @param {ASTNode} node node to evaluate
+         * @returns {void}
+         * @private
+         */
+        function increaseSwitchComplexity(node) {
+
+            // Avoiding `default`
+            if (node.test) {
+                increaseComplexity();
+            }
+        }
+
+        //--------------------------------------------------------------------------
+        // Public API
+        //--------------------------------------------------------------------------
+
+        return {
+            FunctionDeclaration: startFunction,
+            FunctionExpression: startFunction,
+            ArrowFunctionExpression: startFunction,
+            "FunctionDeclaration:exit": endFunction,
+            "FunctionExpression:exit": endFunction,
+            "ArrowFunctionExpression:exit": endFunction,
+
+            CatchClause: increaseComplexity,
+            ConditionalExpression: increaseComplexity,
+            LogicalExpression: increaseComplexity,
+            ForStatement: increaseComplexity,
+            ForInStatement: increaseComplexity,
+            ForOfStatement: increaseComplexity,
+            IfStatement: increaseComplexity,
+            SwitchCase: increaseSwitchComplexity,
+            WhileStatement: increaseComplexity,
+            DoWhileStatement: increaseComplexity,
+
+            AssignmentExpression(node) {
+                if (astUtils.isLogicalAssignmentOperator(node.operator)) {
+                    increaseComplexity();
+                }
+            }
+        };
+
+    }
+};

node_modules/eslint/lib/rules/computed-property-spacing.js

@@ -0,0 +1,204 @@
+/**
+ * @fileoverview Disallows or enforces spaces inside computed properties.
+ * @author Jamund Ferguson
+ */
+"use strict";
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce consistent spacing inside computed property brackets",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/computed-property-spacing"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                enum: ["always", "never"]
+            },
+            {
+                type: "object",
+                properties: {
+                    enforceForClassMembers: {
+                        type: "boolean",
+                        default: true
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+
+        messages: {
+            unexpectedSpaceBefore: "There should be no space before '{{tokenValue}}'.",
+            unexpectedSpaceAfter: "There should be no space after '{{tokenValue}}'.",
+
+            missingSpaceBefore: "A space is required before '{{tokenValue}}'.",
+            missingSpaceAfter: "A space is required after '{{tokenValue}}'."
+        }
+    },
+
+    create(context) {
+        const sourceCode = context.getSourceCode();
+        const propertyNameMustBeSpaced = context.options[0] === "always"; // default is "never"
+        const enforceForClassMembers = !context.options[1] || context.options[1].enforceForClassMembers;
+
+        //--------------------------------------------------------------------------
+        // Helpers
+        //--------------------------------------------------------------------------
+
+        /**
+         * Reports that there shouldn't be a space after the first token
+         * @param {ASTNode} node The node to report in the event of an error.
+         * @param {Token} token The token to use for the report.
+         * @param {Token} tokenAfter The token after `token`.
+         * @returns {void}
+         */
+        function reportNoBeginningSpace(node, token, tokenAfter) {
+            context.report({
+                node,
+                loc: { start: token.loc.end, end: tokenAfter.loc.start },
+                messageId: "unexpectedSpaceAfter",
+                data: {
+                    tokenValue: token.value
+                },
+                fix(fixer) {
+                    return fixer.removeRange([token.range[1], tokenAfter.range[0]]);
+                }
+            });
+        }
+
+        /**
+         * Reports that there shouldn't be a space before the last token
+         * @param {ASTNode} node The node to report in the event of an error.
+         * @param {Token} token The token to use for the report.
+         * @param {Token} tokenBefore The token before `token`.
+         * @returns {void}
+         */
+        function reportNoEndingSpace(node, token, tokenBefore) {
+            context.report({
+                node,
+                loc: { start: tokenBefore.loc.end, end: token.loc.start },
+                messageId: "unexpectedSpaceBefore",
+                data: {
+                    tokenValue: token.value
+                },
+                fix(fixer) {
+                    return fixer.removeRange([tokenBefore.range[1], token.range[0]]);
+                }
+            });
+        }
+
+        /**
+         * Reports that there should be a space after the first token
+         * @param {ASTNode} node The node to report in the event of an error.
+         * @param {Token} token The token to use for the report.
+         * @returns {void}
+         */
+        function reportRequiredBeginningSpace(node, token) {
+            context.report({
+                node,
+                loc: token.loc,
+                messageId: "missingSpaceAfter",
+                data: {
+                    tokenValue: token.value
+                },
+                fix(fixer) {
+                    return fixer.insertTextAfter(token, " ");
+                }
+            });
+        }
+
+        /**
+         * Reports that there should be a space before the last token
+         * @param {ASTNode} node The node to report in the event of an error.
+         * @param {Token} token The token to use for the report.
+         * @returns {void}
+         */
+        function reportRequiredEndingSpace(node, token) {
+            context.report({
+                node,
+                loc: token.loc,
+                messageId: "missingSpaceBefore",
+                data: {
+                    tokenValue: token.value
+                },
+                fix(fixer) {
+                    return fixer.insertTextBefore(token, " ");
+                }
+            });
+        }
+
+        /**
+         * Returns a function that checks the spacing of a node on the property name
+         * that was passed in.
+         * @param {string} propertyName The property on the node to check for spacing
+         * @returns {Function} A function that will check spacing on a node
+         */
+        function checkSpacing(propertyName) {
+            return function(node) {
+                if (!node.computed) {
+                    return;
+                }
+
+                const property = node[propertyName];
+
+                const before = sourceCode.getTokenBefore(property, astUtils.isOpeningBracketToken),
+                    first = sourceCode.getTokenAfter(before, { includeComments: true }),
+                    after = sourceCode.getTokenAfter(property, astUtils.isClosingBracketToken),
+                    last = sourceCode.getTokenBefore(after, { includeComments: true });
+
+                if (astUtils.isTokenOnSameLine(before, first)) {
+                    if (propertyNameMustBeSpaced) {
+                        if (!sourceCode.isSpaceBetweenTokens(before, first) && astUtils.isTokenOnSameLine(before, first)) {
+                            reportRequiredBeginningSpace(node, before);
+                        }
+                    } else {
+                        if (sourceCode.isSpaceBetweenTokens(before, first)) {
+                            reportNoBeginningSpace(node, before, first);
+                        }
+                    }
+                }
+
+                if (astUtils.isTokenOnSameLine(last, after)) {
+                    if (propertyNameMustBeSpaced) {
+                        if (!sourceCode.isSpaceBetweenTokens(last, after) && astUtils.isTokenOnSameLine(last, after)) {
+                            reportRequiredEndingSpace(node, after);
+                        }
+                    } else {
+                        if (sourceCode.isSpaceBetweenTokens(last, after)) {
+                            reportNoEndingSpace(node, after, last);
+                        }
+                    }
+                }
+            };
+        }
+
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        const listeners = {
+            Property: checkSpacing("key"),
+            MemberExpression: checkSpacing("property")
+        };
+
+        if (enforceForClassMembers) {
+            listeners.MethodDefinition = checkSpacing("key");
+        }
+
+        return listeners;
+
+    }
+};

node_modules/eslint/lib/rules/consistent-return.js

@@ -0,0 +1,185 @@
+/**
+ * @fileoverview Rule to flag consistent return values
+ * @author Nicholas C. Zakas
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+const { upperCaseFirst } = require("../shared/string-utils");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Checks whether or not a given code path segment is unreachable.
+ * @param {CodePathSegment} segment A CodePathSegment to check.
+ * @returns {boolean} `true` if the segment is unreachable.
+ */
+function isUnreachable(segment) {
+    return !segment.reachable;
+}
+
+/**
+ * Checks whether a given node is a `constructor` method in an ES6 class
+ * @param {ASTNode} node A node to check
+ * @returns {boolean} `true` if the node is a `constructor` method
+ */
+function isClassConstructor(node) {
+    return node.type === "FunctionExpression" &&
+        node.parent &&
+        node.parent.type === "MethodDefinition" &&
+        node.parent.kind === "constructor";
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "require `return` statements to either always or never specify values",
+            category: "Best Practices",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/consistent-return"
+        },
+
+        schema: [{
+            type: "object",
+            properties: {
+                treatUndefinedAsUnspecified: {
+                    type: "boolean",
+                    default: false
+                }
+            },
+            additionalProperties: false
+        }],
+
+        messages: {
+            missingReturn: "Expected to return a value at the end of {{name}}.",
+            missingReturnValue: "{{name}} expected a return value.",
+            unexpectedReturnValue: "{{name}} expected no return value."
+        }
+    },
+
+    create(context) {
+        const options = context.options[0] || {};
+        const treatUndefinedAsUnspecified = options.treatUndefinedAsUnspecified === true;
+        let funcInfo = null;
+
+        /**
+         * Checks whether of not the implicit returning is consistent if the last
+         * code path segment is reachable.
+         * @param {ASTNode} node A program/function node to check.
+         * @returns {void}
+         */
+        function checkLastSegment(node) {
+            let loc, name;
+
+            /*
+             * Skip if it expected no return value or unreachable.
+             * When unreachable, all paths are returned or thrown.
+             */
+            if (!funcInfo.hasReturnValue ||
+                funcInfo.codePath.currentSegments.every(isUnreachable) ||
+                astUtils.isES5Constructor(node) ||
+                isClassConstructor(node)
+            ) {
+                return;
+            }
+
+            // Adjust a location and a message.
+            if (node.type === "Program") {
+
+                // The head of program.
+                loc = { line: 1, column: 0 };
+                name = "program";
+            } else if (node.type === "ArrowFunctionExpression") {
+
+                // `=>` token
+                loc = context.getSourceCode().getTokenBefore(node.body, astUtils.isArrowToken).loc;
+            } else if (
+                node.parent.type === "MethodDefinition" ||
+                (node.parent.type === "Property" && node.parent.method)
+            ) {
+
+                // Method name.
+                loc = node.parent.key.loc;
+            } else {
+
+                // Function name or `function` keyword.
+                loc = (node.id || context.getSourceCode().getFirstToken(node)).loc;
+            }
+
+            if (!name) {
+                name = astUtils.getFunctionNameWithKind(node);
+            }
+
+            // Reports.
+            context.report({
+                node,
+                loc,
+                messageId: "missingReturn",
+                data: { name }
+            });
+        }
+
+        return {
+
+            // Initializes/Disposes state of each code path.
+            onCodePathStart(codePath, node) {
+                funcInfo = {
+                    upper: funcInfo,
+                    codePath,
+                    hasReturn: false,
+                    hasReturnValue: false,
+                    messageId: "",
+                    node
+                };
+            },
+            onCodePathEnd() {
+                funcInfo = funcInfo.upper;
+            },
+
+            // Reports a given return statement if it's inconsistent.
+            ReturnStatement(node) {
+                const argument = node.argument;
+                let hasReturnValue = Boolean(argument);
+
+                if (treatUndefinedAsUnspecified && hasReturnValue) {
+                    hasReturnValue = !astUtils.isSpecificId(argument, "undefined") && argument.operator !== "void";
+                }
+
+                if (!funcInfo.hasReturn) {
+                    funcInfo.hasReturn = true;
+                    funcInfo.hasReturnValue = hasReturnValue;
+                    funcInfo.messageId = hasReturnValue ? "missingReturnValue" : "unexpectedReturnValue";
+                    funcInfo.data = {
+                        name: funcInfo.node.type === "Program"
+                            ? "Program"
+                            : upperCaseFirst(astUtils.getFunctionNameWithKind(funcInfo.node))
+                    };
+                } else if (funcInfo.hasReturnValue !== hasReturnValue) {
+                    context.report({
+                        node,
+                        messageId: funcInfo.messageId,
+                        data: funcInfo.data
+                    });
+                }
+            },
+
+            // Reports a given program/function if the implicit returning is not consistent.
+            "Program:exit": checkLastSegment,
+            "FunctionDeclaration:exit": checkLastSegment,
+            "FunctionExpression:exit": checkLastSegment,
+            "ArrowFunctionExpression:exit": checkLastSegment
+        };
+    }
+};

node_modules/eslint/lib/rules/consistent-this.js

@@ -0,0 +1,151 @@
+/**
+ * @fileoverview Rule to enforce consistent naming of "this" context variables
+ * @author Raphael Pigulla
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "enforce consistent naming when capturing the current execution context",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/consistent-this"
+        },
+
+        schema: {
+            type: "array",
+            items: {
+                type: "string",
+                minLength: 1
+            },
+            uniqueItems: true
+        },
+
+        messages: {
+            aliasNotAssignedToThis: "Designated alias '{{name}}' is not assigned to 'this'.",
+            unexpectedAlias: "Unexpected alias '{{name}}' for 'this'."
+        }
+    },
+
+    create(context) {
+        let aliases = [];
+
+        if (context.options.length === 0) {
+            aliases.push("that");
+        } else {
+            aliases = context.options;
+        }
+
+        /**
+         * Reports that a variable declarator or assignment expression is assigning
+         * a non-'this' value to the specified alias.
+         * @param {ASTNode} node The assigning node.
+         * @param {string}  name the name of the alias that was incorrectly used.
+         * @returns {void}
+         */
+        function reportBadAssignment(node, name) {
+            context.report({ node, messageId: "aliasNotAssignedToThis", data: { name } });
+        }
+
+        /**
+         * Checks that an assignment to an identifier only assigns 'this' to the
+         * appropriate alias, and the alias is only assigned to 'this'.
+         * @param {ASTNode} node The assigning node.
+         * @param {Identifier} name The name of the variable assigned to.
+         * @param {Expression} value The value of the assignment.
+         * @returns {void}
+         */
+        function checkAssignment(node, name, value) {
+            const isThis = value.type === "ThisExpression";
+
+            if (aliases.indexOf(name) !== -1) {
+                if (!isThis || node.operator && node.operator !== "=") {
+                    reportBadAssignment(node, name);
+                }
+            } else if (isThis) {
+                context.report({ node, messageId: "unexpectedAlias", data: { name } });
+            }
+        }
+
+        /**
+         * Ensures that a variable declaration of the alias in a program or function
+         * is assigned to the correct value.
+         * @param {string} alias alias the check the assignment of.
+         * @param {Object} scope scope of the current code we are checking.
+         * @private
+         * @returns {void}
+         */
+        function checkWasAssigned(alias, scope) {
+            const variable = scope.set.get(alias);
+
+            if (!variable) {
+                return;
+            }
+
+            if (variable.defs.some(def => def.node.type === "VariableDeclarator" &&
+                def.node.init !== null)) {
+                return;
+            }
+
+            /*
+             * The alias has been declared and not assigned: check it was
+             * assigned later in the same scope.
+             */
+            if (!variable.references.some(reference => {
+                const write = reference.writeExpr;
+
+                return (
+                    reference.from === scope &&
+                    write && write.type === "ThisExpression" &&
+                    write.parent.operator === "="
+                );
+            })) {
+                variable.defs.map(def => def.node).forEach(node => {
+                    reportBadAssignment(node, alias);
+                });
+            }
+        }
+
+        /**
+         * Check each alias to ensure that is was assigned to the correct value.
+         * @returns {void}
+         */
+        function ensureWasAssigned() {
+            const scope = context.getScope();
+
+            aliases.forEach(alias => {
+                checkWasAssigned(alias, scope);
+            });
+        }
+
+        return {
+            "Program:exit": ensureWasAssigned,
+            "FunctionExpression:exit": ensureWasAssigned,
+            "FunctionDeclaration:exit": ensureWasAssigned,
+
+            VariableDeclarator(node) {
+                const id = node.id;
+                const isDestructuring =
+                    id.type === "ArrayPattern" || id.type === "ObjectPattern";
+
+                if (node.init !== null && !isDestructuring) {
+                    checkAssignment(node, id.name, node.init);
+                }
+            },
+
+            AssignmentExpression(node) {
+                if (node.left.type === "Identifier") {
+                    checkAssignment(node, node.left.name, node.right);
+                }
+            }
+        };
+
+    }
+};

node_modules/eslint/lib/rules/constructor-super.js

@@ -0,0 +1,423 @@
+/**
+ * @fileoverview A rule to verify `super()` callings in constructor.
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Checks whether a given code path segment is reachable or not.
+ * @param {CodePathSegment} segment A code path segment to check.
+ * @returns {boolean} `true` if the segment is reachable.
+ */
+function isReachable(segment) {
+    return segment.reachable;
+}
+
+/**
+ * Checks whether or not a given node is a constructor.
+ * @param {ASTNode} node A node to check. This node type is one of
+ *   `Program`, `FunctionDeclaration`, `FunctionExpression`, and
+ *   `ArrowFunctionExpression`.
+ * @returns {boolean} `true` if the node is a constructor.
+ */
+function isConstructorFunction(node) {
+    return (
+        node.type === "FunctionExpression" &&
+        node.parent.type === "MethodDefinition" &&
+        node.parent.kind === "constructor"
+    );
+}
+
+/**
+ * Checks whether a given node can be a constructor or not.
+ * @param {ASTNode} node A node to check.
+ * @returns {boolean} `true` if the node can be a constructor.
+ */
+function isPossibleConstructor(node) {
+    if (!node) {
+        return false;
+    }
+
+    switch (node.type) {
+        case "ClassExpression":
+        case "FunctionExpression":
+        case "ThisExpression":
+        case "MemberExpression":
+        case "CallExpression":
+        case "NewExpression":
+        case "ChainExpression":
+        case "YieldExpression":
+        case "TaggedTemplateExpression":
+        case "MetaProperty":
+            return true;
+
+        case "Identifier":
+            return node.name !== "undefined";
+
+        case "AssignmentExpression":
+            if (["=", "&&="].includes(node.operator)) {
+                return isPossibleConstructor(node.right);
+            }
+
+            if (["||=", "??="].includes(node.operator)) {
+                return (
+                    isPossibleConstructor(node.left) ||
+                    isPossibleConstructor(node.right)
+                );
+            }
+
+            /**
+             * All other assignment operators are mathematical assignment operators (arithmetic or bitwise).
+             * An assignment expression with a mathematical operator can either evaluate to a primitive value,
+             * or throw, depending on the operands. Thus, it cannot evaluate to a constructor function.
+             */
+            return false;
+
+        case "LogicalExpression":
+
+            /*
+             * If the && operator short-circuits, the left side was falsy and therefore not a constructor, and if
+             * it doesn't short-circuit, it takes the value from the right side, so the right side must always be a
+             * possible constructor. A future improvement could verify that the left side could be truthy by
+             * excluding falsy literals.
+             */
+            if (node.operator === "&&") {
+                return isPossibleConstructor(node.right);
+            }
+
+            return (
+                isPossibleConstructor(node.left) ||
+                isPossibleConstructor(node.right)
+            );
+
+        case "ConditionalExpression":
+            return (
+                isPossibleConstructor(node.alternate) ||
+                isPossibleConstructor(node.consequent)
+            );
+
+        case "SequenceExpression": {
+            const lastExpression = node.expressions[node.expressions.length - 1];
+
+            return isPossibleConstructor(lastExpression);
+        }
+
+        default:
+            return false;
+    }
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "problem",
+
+        docs: {
+            description: "require `super()` calls in constructors",
+            category: "ECMAScript 6",
+            recommended: true,
+            url: "https://eslint.org/docs/rules/constructor-super"
+        },
+
+        schema: [],
+
+        messages: {
+            missingSome: "Lacked a call of 'super()' in some code paths.",
+            missingAll: "Expected to call 'super()'.",
+
+            duplicate: "Unexpected duplicate 'super()'.",
+            badSuper: "Unexpected 'super()' because 'super' is not a constructor.",
+            unexpected: "Unexpected 'super()'."
+        }
+    },
+
+    create(context) {
+
+        /*
+         * {{hasExtends: boolean, scope: Scope, codePath: CodePath}[]}
+         * Information for each constructor.
+         * - upper:      Information of the upper constructor.
+         * - hasExtends: A flag which shows whether own class has a valid `extends`
+         *               part.
+         * - scope:      The scope of own class.
+         * - codePath:   The code path object of the constructor.
+         */
+        let funcInfo = null;
+
+        /*
+         * {Map<string, {calledInSomePaths: boolean, calledInEveryPaths: boolean}>}
+         * Information for each code path segment.
+         * - calledInSomePaths:  A flag of be called `super()` in some code paths.
+         * - calledInEveryPaths: A flag of be called `super()` in all code paths.
+         * - validNodes:
+         */
+        let segInfoMap = Object.create(null);
+
+        /**
+         * Gets the flag which shows `super()` is called in some paths.
+         * @param {CodePathSegment} segment A code path segment to get.
+         * @returns {boolean} The flag which shows `super()` is called in some paths
+         */
+        function isCalledInSomePath(segment) {
+            return segment.reachable && segInfoMap[segment.id].calledInSomePaths;
+        }
+
+        /**
+         * Gets the flag which shows `super()` is called in all paths.
+         * @param {CodePathSegment} segment A code path segment to get.
+         * @returns {boolean} The flag which shows `super()` is called in all paths.
+         */
+        function isCalledInEveryPath(segment) {
+
+            /*
+             * If specific segment is the looped segment of the current segment,
+             * skip the segment.
+             * If not skipped, this never becomes true after a loop.
+             */
+            if (segment.nextSegments.length === 1 &&
+                segment.nextSegments[0].isLoopedPrevSegment(segment)
+            ) {
+                return true;
+            }
+            return segment.reachable && segInfoMap[segment.id].calledInEveryPaths;
+        }
+
+        return {
+
+            /**
+             * Stacks a constructor information.
+             * @param {CodePath} codePath A code path which was started.
+             * @param {ASTNode} node The current node.
+             * @returns {void}
+             */
+            onCodePathStart(codePath, node) {
+                if (isConstructorFunction(node)) {
+
+                    // Class > ClassBody > MethodDefinition > FunctionExpression
+                    const classNode = node.parent.parent.parent;
+                    const superClass = classNode.superClass;
+
+                    funcInfo = {
+                        upper: funcInfo,
+                        isConstructor: true,
+                        hasExtends: Boolean(superClass),
+                        superIsConstructor: isPossibleConstructor(superClass),
+                        codePath
+                    };
+                } else {
+                    funcInfo = {
+                        upper: funcInfo,
+                        isConstructor: false,
+                        hasExtends: false,
+                        superIsConstructor: false,
+                        codePath
+                    };
+                }
+            },
+
+            /**
+             * Pops a constructor information.
+             * And reports if `super()` lacked.
+             * @param {CodePath} codePath A code path which was ended.
+             * @param {ASTNode} node The current node.
+             * @returns {void}
+             */
+            onCodePathEnd(codePath, node) {
+                const hasExtends = funcInfo.hasExtends;
+
+                // Pop.
+                funcInfo = funcInfo.upper;
+
+                if (!hasExtends) {
+                    return;
+                }
+
+                // Reports if `super()` lacked.
+                const segments = codePath.returnedSegments;
+                const calledInEveryPaths = segments.every(isCalledInEveryPath);
+                const calledInSomePaths = segments.some(isCalledInSomePath);
+
+                if (!calledInEveryPaths) {
+                    context.report({
+                        messageId: calledInSomePaths
+                            ? "missingSome"
+                            : "missingAll",
+                        node: node.parent
+                    });
+                }
+            },
+
+            /**
+             * Initialize information of a given code path segment.
+             * @param {CodePathSegment} segment A code path segment to initialize.
+             * @returns {void}
+             */
+            onCodePathSegmentStart(segment) {
+                if (!(funcInfo && funcInfo.isConstructor && funcInfo.hasExtends)) {
+                    return;
+                }
+
+                // Initialize info.
+                const info = segInfoMap[segment.id] = {
+                    calledInSomePaths: false,
+                    calledInEveryPaths: false,
+                    validNodes: []
+                };
+
+                // When there are previous segments, aggregates these.
+                const prevSegments = segment.prevSegments;
+
+                if (prevSegments.length > 0) {
+                    info.calledInSomePaths = prevSegments.some(isCalledInSomePath);
+                    info.calledInEveryPaths = prevSegments.every(isCalledInEveryPath);
+                }
+            },
+
+            /**
+             * Update information of the code path segment when a code path was
+             * looped.
+             * @param {CodePathSegment} fromSegment The code path segment of the
+             *      end of a loop.
+             * @param {CodePathSegment} toSegment A code path segment of the head
+             *      of a loop.
+             * @returns {void}
+             */
+            onCodePathSegmentLoop(fromSegment, toSegment) {
+                if (!(funcInfo && funcInfo.isConstructor && funcInfo.hasExtends)) {
+                    return;
+                }
+
+                // Update information inside of the loop.
+                const isRealLoop = toSegment.prevSegments.length >= 2;
+
+                funcInfo.codePath.traverseSegments(
+                    { first: toSegment, last: fromSegment },
+                    segment => {
+                        const info = segInfoMap[segment.id];
+                        const prevSegments = segment.prevSegments;
+
+                        // Updates flags.
+                        info.calledInSomePaths = prevSegments.some(isCalledInSomePath);
+                        info.calledInEveryPaths = prevSegments.every(isCalledInEveryPath);
+
+                        // If flags become true anew, reports the valid nodes.
+                        if (info.calledInSomePaths || isRealLoop) {
+                            const nodes = info.validNodes;
+
+                            info.validNodes = [];
+
+                            for (let i = 0; i < nodes.length; ++i) {
+                                const node = nodes[i];
+
+                                context.report({
+                                    messageId: "duplicate",
+                                    node
+                                });
+                            }
+                        }
+                    }
+                );
+            },
+
+            /**
+             * Checks for a call of `super()`.
+             * @param {ASTNode} node A CallExpression node to check.
+             * @returns {void}
+             */
+            "CallExpression:exit"(node) {
+                if (!(funcInfo && funcInfo.isConstructor)) {
+                    return;
+                }
+
+                // Skips except `super()`.
+                if (node.callee.type !== "Super") {
+                    return;
+                }
+
+                // Reports if needed.
+                if (funcInfo.hasExtends) {
+                    const segments = funcInfo.codePath.currentSegments;
+                    let duplicate = false;
+                    let info = null;
+
+                    for (let i = 0; i < segments.length; ++i) {
+                        const segment = segments[i];
+
+                        if (segment.reachable) {
+                            info = segInfoMap[segment.id];
+
+                            duplicate = duplicate || info.calledInSomePaths;
+                            info.calledInSomePaths = info.calledInEveryPaths = true;
+                        }
+                    }
+
+                    if (info) {
+                        if (duplicate) {
+                            context.report({
+                                messageId: "duplicate",
+                                node
+                            });
+                        } else if (!funcInfo.superIsConstructor) {
+                            context.report({
+                                messageId: "badSuper",
+                                node
+                            });
+                        } else {
+                            info.validNodes.push(node);
+                        }
+                    }
+                } else if (funcInfo.codePath.currentSegments.some(isReachable)) {
+                    context.report({
+                        messageId: "unexpected",
+                        node
+                    });
+                }
+            },
+
+            /**
+             * Set the mark to the returned path as `super()` was called.
+             * @param {ASTNode} node A ReturnStatement node to check.
+             * @returns {void}
+             */
+            ReturnStatement(node) {
+                if (!(funcInfo && funcInfo.isConstructor && funcInfo.hasExtends)) {
+                    return;
+                }
+
+                // Skips if no argument.
+                if (!node.argument) {
+                    return;
+                }
+
+                // Returning argument is a substitute of 'super()'.
+                const segments = funcInfo.codePath.currentSegments;
+
+                for (let i = 0; i < segments.length; ++i) {
+                    const segment = segments[i];
+
+                    if (segment.reachable) {
+                        const info = segInfoMap[segment.id];
+
+                        info.calledInSomePaths = info.calledInEveryPaths = true;
+                    }
+                }
+            },
+
+            /**
+             * Resets state.
+             * @returns {void}
+             */
+            "Program:exit"() {
+                segInfoMap = Object.create(null);
+            }
+        };
+    }
+};

node_modules/eslint/lib/rules/curly.js

@@ -0,0 +1,486 @@
+/**
+ * @fileoverview Rule to flag statements without curly braces
+ * @author Nicholas C. Zakas
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "enforce consistent brace style for all control statements",
+            category: "Best Practices",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/curly"
+        },
+
+        schema: {
+            anyOf: [
+                {
+                    type: "array",
+                    items: [
+                        {
+                            enum: ["all"]
+                        }
+                    ],
+                    minItems: 0,
+                    maxItems: 1
+                },
+                {
+                    type: "array",
+                    items: [
+                        {
+                            enum: ["multi", "multi-line", "multi-or-nest"]
+                        },
+                        {
+                            enum: ["consistent"]
+                        }
+                    ],
+                    minItems: 0,
+                    maxItems: 2
+                }
+            ]
+        },
+
+        fixable: "code",
+
+        messages: {
+            missingCurlyAfter: "Expected { after '{{name}}'.",
+            missingCurlyAfterCondition: "Expected { after '{{name}}' condition.",
+            unexpectedCurlyAfter: "Unnecessary { after '{{name}}'.",
+            unexpectedCurlyAfterCondition: "Unnecessary { after '{{name}}' condition."
+        }
+    },
+
+    create(context) {
+
+        const multiOnly = (context.options[0] === "multi");
+        const multiLine = (context.options[0] === "multi-line");
+        const multiOrNest = (context.options[0] === "multi-or-nest");
+        const consistent = (context.options[1] === "consistent");
+
+        const sourceCode = context.getSourceCode();
+
+        //--------------------------------------------------------------------------
+        // Helpers
+        //--------------------------------------------------------------------------
+
+        /**
+         * Determines if a given node is a one-liner that's on the same line as it's preceding code.
+         * @param {ASTNode} node The node to check.
+         * @returns {boolean} True if the node is a one-liner that's on the same line as it's preceding code.
+         * @private
+         */
+        function isCollapsedOneLiner(node) {
+            const before = sourceCode.getTokenBefore(node);
+            const last = sourceCode.getLastToken(node);
+            const lastExcludingSemicolon = astUtils.isSemicolonToken(last) ? sourceCode.getTokenBefore(last) : last;
+
+            return before.loc.start.line === lastExcludingSemicolon.loc.end.line;
+        }
+
+        /**
+         * Determines if a given node is a one-liner.
+         * @param {ASTNode} node The node to check.
+         * @returns {boolean} True if the node is a one-liner.
+         * @private
+         */
+        function isOneLiner(node) {
+            if (node.type === "EmptyStatement") {
+                return true;
+            }
+
+            const first = sourceCode.getFirstToken(node);
+            const last = sourceCode.getLastToken(node);
+            const lastExcludingSemicolon = astUtils.isSemicolonToken(last) ? sourceCode.getTokenBefore(last) : last;
+
+            return first.loc.start.line === lastExcludingSemicolon.loc.end.line;
+        }
+
+        /**
+         * Determines if the given node is a lexical declaration (let, const, function, or class)
+         * @param {ASTNode} node The node to check
+         * @returns {boolean} True if the node is a lexical declaration
+         * @private
+         */
+        function isLexicalDeclaration(node) {
+            if (node.type === "VariableDeclaration") {
+                return node.kind === "const" || node.kind === "let";
+            }
+
+            return node.type === "FunctionDeclaration" || node.type === "ClassDeclaration";
+        }
+
+        /**
+         * Checks if the given token is an `else` token or not.
+         * @param {Token} token The token to check.
+         * @returns {boolean} `true` if the token is an `else` token.
+         */
+        function isElseKeywordToken(token) {
+            return token.value === "else" && token.type === "Keyword";
+        }
+
+        /**
+         * Determines whether the given node has an `else` keyword token as the first token after.
+         * @param {ASTNode} node The node to check.
+         * @returns {boolean} `true` if the node is followed by an `else` keyword token.
+         */
+        function isFollowedByElseKeyword(node) {
+            const nextToken = sourceCode.getTokenAfter(node);
+
+            return Boolean(nextToken) && isElseKeywordToken(nextToken);
+        }
+
+        /**
+         * Determines if a semicolon needs to be inserted after removing a set of curly brackets, in order to avoid a SyntaxError.
+         * @param {Token} closingBracket The } token
+         * @returns {boolean} `true` if a semicolon needs to be inserted after the last statement in the block.
+         */
+        function needsSemicolon(closingBracket) {
+            const tokenBefore = sourceCode.getTokenBefore(closingBracket);
+            const tokenAfter = sourceCode.getTokenAfter(closingBracket);
+            const lastBlockNode = sourceCode.getNodeByRangeIndex(tokenBefore.range[0]);
+
+            if (astUtils.isSemicolonToken(tokenBefore)) {
+
+                // If the last statement already has a semicolon, don't add another one.
+                return false;
+            }
+
+            if (!tokenAfter) {
+
+                // If there are no statements after this block, there is no need to add a semicolon.
+                return false;
+            }
+
+            if (lastBlockNode.type === "BlockStatement" && lastBlockNode.parent.type !== "FunctionExpression" && lastBlockNode.parent.type !== "ArrowFunctionExpression") {
+
+                /*
+                 * If the last node surrounded by curly brackets is a BlockStatement (other than a FunctionExpression or an ArrowFunctionExpression),
+                 * don't insert a semicolon. Otherwise, the semicolon would be parsed as a separate statement, which would cause
+                 * a SyntaxError if it was followed by `else`.
+                 */
+                return false;
+            }
+
+            if (tokenBefore.loc.end.line === tokenAfter.loc.start.line) {
+
+                // If the next token is on the same line, insert a semicolon.
+                return true;
+            }
+
+            if (/^[([/`+-]/u.test(tokenAfter.value)) {
+
+                // If the next token starts with a character that would disrupt ASI, insert a semicolon.
+                return true;
+            }
+
+            if (tokenBefore.type === "Punctuator" && (tokenBefore.value === "++" || tokenBefore.value === "--")) {
+
+                // If the last token is ++ or --, insert a semicolon to avoid disrupting ASI.
+                return true;
+            }
+
+            // Otherwise, do not insert a semicolon.
+            return false;
+        }
+
+        /**
+         * Determines whether the code represented by the given node contains an `if` statement
+         * that would become associated with an `else` keyword directly appended to that code.
+         *
+         * Examples where it returns `true`:
+         *
+         *    if (a)
+         *        foo();
+         *
+         *    if (a) {
+         *        foo();
+         *    }
+         *
+         *    if (a)
+         *        foo();
+         *    else if (b)
+         *        bar();
+         *
+         *    while (a)
+         *        if (b)
+         *            if(c)
+         *                foo();
+         *            else
+         *                bar();
+         *
+         * Examples where it returns `false`:
+         *
+         *    if (a)
+         *        foo();
+         *    else
+         *        bar();
+         *
+         *    while (a) {
+         *        if (b)
+         *            if(c)
+         *                foo();
+         *            else
+         *                bar();
+         *    }
+         *
+         *    while (a)
+         *        if (b) {
+         *            if(c)
+         *                foo();
+         *        }
+         *        else
+         *            bar();
+         * @param {ASTNode} node Node representing the code to check.
+         * @returns {boolean} `true` if an `if` statement within the code would become associated with an `else` appended to that code.
+         */
+        function hasUnsafeIf(node) {
+            switch (node.type) {
+                case "IfStatement":
+                    if (!node.alternate) {
+                        return true;
+                    }
+                    return hasUnsafeIf(node.alternate);
+                case "ForStatement":
+                case "ForInStatement":
+                case "ForOfStatement":
+                case "LabeledStatement":
+                case "WithStatement":
+                case "WhileStatement":
+                    return hasUnsafeIf(node.body);
+                default:
+                    return false;
+            }
+        }
+
+        /**
+         * Determines whether the existing curly braces around the single statement are necessary to preserve the semantics of the code.
+         * The braces, which make the given block body, are necessary in either of the following situations:
+         *
+         * 1. The statement is a lexical declaration.
+         * 2. Without the braces, an `if` within the statement would become associated with an `else` after the closing brace:
+         *
+         *     if (a) {
+         *         if (b)
+         *             foo();
+         *     }
+         *     else
+         *         bar();
+         *
+         *     if (a)
+         *         while (b)
+         *             while (c) {
+         *                 while (d)
+         *                     if (e)
+         *                         while(f)
+         *                             foo();
+         *            }
+         *     else
+         *         bar();
+         * @param {ASTNode} node `BlockStatement` body with exactly one statement directly inside. The statement can have its own nested statements.
+         * @returns {boolean} `true` if the braces are necessary - removing them (replacing the given `BlockStatement` body with its single statement content)
+         * would change the semantics of the code or produce a syntax error.
+         */
+        function areBracesNecessary(node) {
+            const statement = node.body[0];
+
+            return isLexicalDeclaration(statement) ||
+                hasUnsafeIf(statement) && isFollowedByElseKeyword(node);
+        }
+
+        /**
+         * Prepares to check the body of a node to see if it's a block statement.
+         * @param {ASTNode} node The node to report if there's a problem.
+         * @param {ASTNode} body The body node to check for blocks.
+         * @param {string} name The name to report if there's a problem.
+         * @param {{ condition: boolean }} opts Options to pass to the report functions
+         * @returns {Object} a prepared check object, with "actual", "expected", "check" properties.
+         *   "actual" will be `true` or `false` whether the body is already a block statement.
+         *   "expected" will be `true` or `false` if the body should be a block statement or not, or
+         *   `null` if it doesn't matter, depending on the rule options. It can be modified to change
+         *   the final behavior of "check".
+         *   "check" will be a function reporting appropriate problems depending on the other
+         *   properties.
+         */
+        function prepareCheck(node, body, name, opts) {
+            const hasBlock = (body.type === "BlockStatement");
+            let expected = null;
+
+            if (hasBlock && (body.body.length !== 1 || areBracesNecessary(body))) {
+                expected = true;
+            } else if (multiOnly) {
+                expected = false;
+            } else if (multiLine) {
+                if (!isCollapsedOneLiner(body)) {
+                    expected = true;
+                }
+
+                // otherwise, the body is allowed to have braces or not to have braces
+
+            } else if (multiOrNest) {
+                if (hasBlock) {
+                    const statement = body.body[0];
+                    const leadingCommentsInBlock = sourceCode.getCommentsBefore(statement);
+
+                    expected = !isOneLiner(statement) || leadingCommentsInBlock.length > 0;
+                } else {
+                    expected = !isOneLiner(body);
+                }
+            } else {
+
+                // default "all"
+                expected = true;
+            }
+
+            return {
+                actual: hasBlock,
+                expected,
+                check() {
+                    if (this.expected !== null && this.expected !== this.actual) {
+                        if (this.expected) {
+                            context.report({
+                                node,
+                                loc: body.loc,
+                                messageId: opts && opts.condition ? "missingCurlyAfterCondition" : "missingCurlyAfter",
+                                data: {
+                                    name
+                                },
+                                fix: fixer => fixer.replaceText(body, `{${sourceCode.getText(body)}}`)
+                            });
+                        } else {
+                            context.report({
+                                node,
+                                loc: body.loc,
+                                messageId: opts && opts.condition ? "unexpectedCurlyAfterCondition" : "unexpectedCurlyAfter",
+                                data: {
+                                    name
+                                },
+                                fix(fixer) {
+
+                                    /*
+                                     * `do while` expressions sometimes need a space to be inserted after `do`.
+                                     * e.g. `do{foo()} while (bar)` should be corrected to `do foo() while (bar)`
+                                     */
+                                    const needsPrecedingSpace = node.type === "DoWhileStatement" &&
+                                        sourceCode.getTokenBefore(body).range[1] === body.range[0] &&
+                                        !astUtils.canTokensBeAdjacent("do", sourceCode.getFirstToken(body, { skip: 1 }));
+
+                                    const openingBracket = sourceCode.getFirstToken(body);
+                                    const closingBracket = sourceCode.getLastToken(body);
+                                    const lastTokenInBlock = sourceCode.getTokenBefore(closingBracket);
+
+                                    if (needsSemicolon(closingBracket)) {
+
+                                        /*
+                                         * If removing braces would cause a SyntaxError due to multiple statements on the same line (or
+                                         * change the semantics of the code due to ASI), don't perform a fix.
+                                         */
+                                        return null;
+                                    }
+
+                                    const resultingBodyText = sourceCode.getText().slice(openingBracket.range[1], lastTokenInBlock.range[0]) +
+                                        sourceCode.getText(lastTokenInBlock) +
+                                        sourceCode.getText().slice(lastTokenInBlock.range[1], closingBracket.range[0]);
+
+                                    return fixer.replaceText(body, (needsPrecedingSpace ? " " : "") + resultingBodyText);
+                                }
+                            });
+                        }
+                    }
+                }
+            };
+        }
+
+        /**
+         * Prepares to check the bodies of a "if", "else if" and "else" chain.
+         * @param {ASTNode} node The first IfStatement node of the chain.
+         * @returns {Object[]} prepared checks for each body of the chain. See `prepareCheck` for more
+         *   information.
+         */
+        function prepareIfChecks(node) {
+            const preparedChecks = [];
+
+            for (let currentNode = node; currentNode; currentNode = currentNode.alternate) {
+                preparedChecks.push(prepareCheck(currentNode, currentNode.consequent, "if", { condition: true }));
+                if (currentNode.alternate && currentNode.alternate.type !== "IfStatement") {
+                    preparedChecks.push(prepareCheck(currentNode, currentNode.alternate, "else"));
+                    break;
+                }
+            }
+
+            if (consistent) {
+
+                /*
+                 * If any node should have or already have braces, make sure they
+                 * all have braces.
+                 * If all nodes shouldn't have braces, make sure they don't.
+                 */
+                const expected = preparedChecks.some(preparedCheck => {
+                    if (preparedCheck.expected !== null) {
+                        return preparedCheck.expected;
+                    }
+                    return preparedCheck.actual;
+                });
+
+                preparedChecks.forEach(preparedCheck => {
+                    preparedCheck.expected = expected;
+                });
+            }
+
+            return preparedChecks;
+        }
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+            IfStatement(node) {
+                const parent = node.parent;
+                const isElseIf = parent.type === "IfStatement" && parent.alternate === node;
+
+                if (!isElseIf) {
+
+                    // This is a top `if`, check the whole `if-else-if` chain
+                    prepareIfChecks(node).forEach(preparedCheck => {
+                        preparedCheck.check();
+                    });
+                }
+
+                // Skip `else if`, it's already checked (when the top `if` was visited)
+            },
+
+            WhileStatement(node) {
+                prepareCheck(node, node.body, "while", { condition: true }).check();
+            },
+
+            DoWhileStatement(node) {
+                prepareCheck(node, node.body, "do").check();
+            },
+
+            ForStatement(node) {
+                prepareCheck(node, node.body, "for", { condition: true }).check();
+            },
+
+            ForInStatement(node) {
+                prepareCheck(node, node.body, "for-in").check();
+            },
+
+            ForOfStatement(node) {
+                prepareCheck(node, node.body, "for-of").check();
+            }
+        };
+    }
+};

node_modules/eslint/lib/rules/default-case-last.js

@@ -0,0 +1,44 @@
+/**
+ * @fileoverview Rule to enforce default clauses in switch statements to be last
+ * @author Milos Djermanovic
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "enforce default clauses in switch statements to be last",
+            category: "Best Practices",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/default-case-last"
+        },
+
+        schema: [],
+
+        messages: {
+            notLast: "Default clause should be the last clause."
+        }
+    },
+
+    create(context) {
+        return {
+            SwitchStatement(node) {
+                const cases = node.cases,
+                    indexOfDefault = cases.findIndex(c => c.test === null);
+
+                if (indexOfDefault !== -1 && indexOfDefault !== cases.length - 1) {
+                    const defaultClause = cases[indexOfDefault];
+
+                    context.report({ node: defaultClause, messageId: "notLast" });
+                }
+            }
+        };
+    }
+};

node_modules/eslint/lib/rules/default-case.js

@@ -0,0 +1,97 @@
+/**
+ * @fileoverview require default case in switch statements
+ * @author Aliaksei Shytkin
+ */
+"use strict";
+
+const DEFAULT_COMMENT_PATTERN = /^no default$/iu;
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "require `default` cases in `switch` statements",
+            category: "Best Practices",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/default-case"
+        },
+
+        schema: [{
+            type: "object",
+            properties: {
+                commentPattern: {
+                    type: "string"
+                }
+            },
+            additionalProperties: false
+        }],
+
+        messages: {
+            missingDefaultCase: "Expected a default case."
+        }
+    },
+
+    create(context) {
+        const options = context.options[0] || {};
+        const commentPattern = options.commentPattern
+            ? new RegExp(options.commentPattern, "u")
+            : DEFAULT_COMMENT_PATTERN;
+
+        const sourceCode = context.getSourceCode();
+
+        //--------------------------------------------------------------------------
+        // Helpers
+        //--------------------------------------------------------------------------
+
+        /**
+         * Shortcut to get last element of array
+         * @param  {*[]} collection Array
+         * @returns {*} Last element
+         */
+        function last(collection) {
+            return collection[collection.length - 1];
+        }
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+
+            SwitchStatement(node) {
+
+                if (!node.cases.length) {
+
+                    /*
+                     * skip check of empty switch because there is no easy way
+                     * to extract comments inside it now
+                     */
+                    return;
+                }
+
+                const hasDefault = node.cases.some(v => v.test === null);
+
+                if (!hasDefault) {
+
+                    let comment;
+
+                    const lastCase = last(node.cases);
+                    const comments = sourceCode.getCommentsAfter(lastCase);
+
+                    if (comments.length) {
+                        comment = last(comments);
+                    }
+
+                    if (!comment || !commentPattern.test(comment.value.trim())) {
+                        context.report({ node, messageId: "missingDefaultCase" });
+                    }
+                }
+            }
+        };
+    }
+};

node_modules/eslint/lib/rules/default-param-last.js

@@ -0,0 +1,62 @@
+/**
+ * @fileoverview enforce default parameters to be last
+ * @author Chiawen Chen
+ */
+
+"use strict";
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "enforce default parameters to be last",
+            category: "Best Practices",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/default-param-last"
+        },
+
+        schema: [],
+
+        messages: {
+            shouldBeLast: "Default parameters should be last."
+        }
+    },
+
+    create(context) {
+
+        // eslint-disable-next-line jsdoc/require-description
+        /**
+         * @param {ASTNode} node function node
+         * @returns {void}
+         */
+        function handleFunction(node) {
+            let hasSeenPlainParam = false;
+
+            for (let i = node.params.length - 1; i >= 0; i -= 1) {
+                const param = node.params[i];
+
+                if (
+                    param.type !== "AssignmentPattern" &&
+                    param.type !== "RestElement"
+                ) {
+                    hasSeenPlainParam = true;
+                    continue;
+                }
+
+                if (hasSeenPlainParam && param.type === "AssignmentPattern") {
+                    context.report({
+                        node: param,
+                        messageId: "shouldBeLast"
+                    });
+                }
+            }
+        }
+
+        return {
+            FunctionDeclaration: handleFunction,
+            FunctionExpression: handleFunction,
+            ArrowFunctionExpression: handleFunction
+        };
+    }
+};

node_modules/eslint/lib/rules/dot-location.js

@@ -0,0 +1,105 @@
+/**
+ * @fileoverview Validates newlines before and after dots
+ * @author Greg Cochard
+ */
+
+"use strict";
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce consistent newlines before and after dots",
+            category: "Best Practices",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/dot-location"
+        },
+
+        schema: [
+            {
+                enum: ["object", "property"]
+            }
+        ],
+
+        fixable: "code",
+
+        messages: {
+            expectedDotAfterObject: "Expected dot to be on same line as object.",
+            expectedDotBeforeProperty: "Expected dot to be on same line as property."
+        }
+    },
+
+    create(context) {
+
+        const config = context.options[0];
+
+        // default to onObject if no preference is passed
+        const onObject = config === "object" || !config;
+
+        const sourceCode = context.getSourceCode();
+
+        /**
+         * Reports if the dot between object and property is on the correct location.
+         * @param {ASTNode} node The `MemberExpression` node.
+         * @returns {void}
+         */
+        function checkDotLocation(node) {
+            const property = node.property;
+            const dotToken = sourceCode.getTokenBefore(property);
+
+            if (onObject) {
+
+                // `obj` expression can be parenthesized, but those paren tokens are not a part of the `obj` node.
+                const tokenBeforeDot = sourceCode.getTokenBefore(dotToken);
+
+                if (!astUtils.isTokenOnSameLine(tokenBeforeDot, dotToken)) {
+                    context.report({
+                        node,
+                        loc: dotToken.loc,
+                        messageId: "expectedDotAfterObject",
+                        *fix(fixer) {
+                            if (dotToken.value.startsWith(".") && astUtils.isDecimalIntegerNumericToken(tokenBeforeDot)) {
+                                yield fixer.insertTextAfter(tokenBeforeDot, ` ${dotToken.value}`);
+                            } else {
+                                yield fixer.insertTextAfter(tokenBeforeDot, dotToken.value);
+                            }
+                            yield fixer.remove(dotToken);
+                        }
+                    });
+                }
+            } else if (!astUtils.isTokenOnSameLine(dotToken, property)) {
+                context.report({
+                    node,
+                    loc: dotToken.loc,
+                    messageId: "expectedDotBeforeProperty",
+                    *fix(fixer) {
+                        yield fixer.remove(dotToken);
+                        yield fixer.insertTextBefore(property, dotToken.value);
+                    }
+                });
+            }
+        }
+
+        /**
+         * Checks the spacing of the dot within a member expression.
+         * @param {ASTNode} node The node to check.
+         * @returns {void}
+         */
+        function checkNode(node) {
+            if (!node.computed) {
+                checkDotLocation(node);
+            }
+        }
+
+        return {
+            MemberExpression: checkNode
+        };
+    }
+};

node_modules/eslint/lib/rules/dot-notation.js

@@ -0,0 +1,176 @@
+/**
+ * @fileoverview Rule to warn about using dot notation instead of square bracket notation when possible.
+ * @author Josh Perez
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+const keywords = require("./utils/keywords");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+const validIdentifier = /^[a-zA-Z_$][a-zA-Z0-9_$]*$/u;
+
+// `null` literal must be handled separately.
+const literalTypesToCheck = new Set(["string", "boolean"]);
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "enforce dot notation whenever possible",
+            category: "Best Practices",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/dot-notation"
+        },
+
+        schema: [
+            {
+                type: "object",
+                properties: {
+                    allowKeywords: {
+                        type: "boolean",
+                        default: true
+                    },
+                    allowPattern: {
+                        type: "string",
+                        default: ""
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+
+        fixable: "code",
+
+        messages: {
+            useDot: "[{{key}}] is better written in dot notation.",
+            useBrackets: ".{{key}} is a syntax error."
+        }
+    },
+
+    create(context) {
+        const options = context.options[0] || {};
+        const allowKeywords = options.allowKeywords === void 0 || options.allowKeywords;
+        const sourceCode = context.getSourceCode();
+
+        let allowPattern;
+
+        if (options.allowPattern) {
+            allowPattern = new RegExp(options.allowPattern, "u");
+        }
+
+        /**
+         * Check if the property is valid dot notation
+         * @param {ASTNode} node The dot notation node
+         * @param {string} value Value which is to be checked
+         * @returns {void}
+         */
+        function checkComputedProperty(node, value) {
+            if (
+                validIdentifier.test(value) &&
+                (allowKeywords || keywords.indexOf(String(value)) === -1) &&
+                !(allowPattern && allowPattern.test(value))
+            ) {
+                const formattedValue = node.property.type === "Literal" ? JSON.stringify(value) : `\`${value}\``;
+
+                context.report({
+                    node: node.property,
+                    messageId: "useDot",
+                    data: {
+                        key: formattedValue
+                    },
+                    *fix(fixer) {
+                        const leftBracket = sourceCode.getTokenAfter(node.object, astUtils.isOpeningBracketToken);
+                        const rightBracket = sourceCode.getLastToken(node);
+                        const nextToken = sourceCode.getTokenAfter(node);
+
+                        // Don't perform any fixes if there are comments inside the brackets.
+                        if (sourceCode.commentsExistBetween(leftBracket, rightBracket)) {
+                            return;
+                        }
+
+                        // Replace the brackets by an identifier.
+                        if (!node.optional) {
+                            yield fixer.insertTextBefore(
+                                leftBracket,
+                                astUtils.isDecimalInteger(node.object) ? " ." : "."
+                            );
+                        }
+                        yield fixer.replaceTextRange(
+                            [leftBracket.range[0], rightBracket.range[1]],
+                            value
+                        );
+
+                        // Insert a space after the property if it will be connected to the next token.
+                        if (
+                            nextToken &&
+                            rightBracket.range[1] === nextToken.range[0] &&
+                            !astUtils.canTokensBeAdjacent(String(value), nextToken)
+                        ) {
+                            yield fixer.insertTextAfter(node, " ");
+                        }
+                    }
+                });
+            }
+        }
+
+        return {
+            MemberExpression(node) {
+                if (
+                    node.computed &&
+                    node.property.type === "Literal" &&
+                    (literalTypesToCheck.has(typeof node.property.value) || astUtils.isNullLiteral(node.property))
+                ) {
+                    checkComputedProperty(node, node.property.value);
+                }
+                if (
+                    node.computed &&
+                    node.property.type === "TemplateLiteral" &&
+                    node.property.expressions.length === 0
+                ) {
+                    checkComputedProperty(node, node.property.quasis[0].value.cooked);
+                }
+                if (
+                    !allowKeywords &&
+                    !node.computed &&
+                    keywords.indexOf(String(node.property.name)) !== -1
+                ) {
+                    context.report({
+                        node: node.property,
+                        messageId: "useBrackets",
+                        data: {
+                            key: node.property.name
+                        },
+                        *fix(fixer) {
+                            const dotToken = sourceCode.getTokenBefore(node.property);
+
+                            // A statement that starts with `let[` is parsed as a destructuring variable declaration, not a MemberExpression.
+                            if (node.object.type === "Identifier" && node.object.name === "let" && !node.optional) {
+                                return;
+                            }
+
+                            // Don't perform any fixes if there are comments between the dot and the property name.
+                            if (sourceCode.commentsExistBetween(dotToken, node.property)) {
+                                return;
+                            }
+
+                            // Replace the identifier to brackets.
+                            if (!node.optional) {
+                                yield fixer.remove(dotToken);
+                            }
+                            yield fixer.replaceText(node.property, `["${node.property.name}"]`);
+                        }
+                    });
+                }
+            }
+        };
+    }
+};

node_modules/eslint/lib/rules/eol-last.js

@@ -0,0 +1,107 @@
+/**
+ * @fileoverview Require or disallow newline at the end of files
+ * @author Nodeca Team <https://github.com/nodeca>
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "require or disallow newline at the end of files",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/eol-last"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                enum: ["always", "never", "unix", "windows"]
+            }
+        ],
+
+        messages: {
+            missing: "Newline required at end of file but not found.",
+            unexpected: "Newline not allowed at end of file."
+        }
+    },
+    create(context) {
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+            Program: function checkBadEOF(node) {
+                const sourceCode = context.getSourceCode(),
+                    src = sourceCode.getText(),
+                    lastLine = sourceCode.lines[sourceCode.lines.length - 1],
+                    location = {
+                        column: lastLine.length,
+                        line: sourceCode.lines.length
+                    },
+                    LF = "\n",
+                    CRLF = `\r${LF}`,
+                    endsWithNewline = src.endsWith(LF);
+
+                /*
+                 * Empty source is always valid: No content in file so we don't
+                 * need to lint for a newline on the last line of content.
+                 */
+                if (!src.length) {
+                    return;
+                }
+
+                let mode = context.options[0] || "always",
+                    appendCRLF = false;
+
+                if (mode === "unix") {
+
+                    // `"unix"` should behave exactly as `"always"`
+                    mode = "always";
+                }
+                if (mode === "windows") {
+
+                    // `"windows"` should behave exactly as `"always"`, but append CRLF in the fixer for backwards compatibility
+                    mode = "always";
+                    appendCRLF = true;
+                }
+                if (mode === "always" && !endsWithNewline) {
+
+                    // File is not newline-terminated, but should be
+                    context.report({
+                        node,
+                        loc: location,
+                        messageId: "missing",
+                        fix(fixer) {
+                            return fixer.insertTextAfterRange([0, src.length], appendCRLF ? CRLF : LF);
+                        }
+                    });
+                } else if (mode === "never" && endsWithNewline) {
+
+                    // File is newline-terminated, but shouldn't be
+                    context.report({
+                        node,
+                        loc: location,
+                        messageId: "unexpected",
+                        fix(fixer) {
+                            const finalEOLs = /(?:\r?\n)+$/u,
+                                match = finalEOLs.exec(sourceCode.text),
+                                start = match.index,
+                                end = sourceCode.text.length;
+
+                            return fixer.replaceTextRange([start, end], "");
+                        }
+                    });
+                }
+            }
+        };
+    }
+};

node_modules/eslint/lib/rules/eqeqeq.js

@@ -0,0 +1,174 @@
+/**
+ * @fileoverview Rule to flag statements that use != and == instead of !== and ===
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "require the use of `===` and `!==`",
+            category: "Best Practices",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/eqeqeq"
+        },
+
+        schema: {
+            anyOf: [
+                {
+                    type: "array",
+                    items: [
+                        {
+                            enum: ["always"]
+                        },
+                        {
+                            type: "object",
+                            properties: {
+                                null: {
+                                    enum: ["always", "never", "ignore"]
+                                }
+                            },
+                            additionalProperties: false
+                        }
+                    ],
+                    additionalItems: false
+                },
+                {
+                    type: "array",
+                    items: [
+                        {
+                            enum: ["smart", "allow-null"]
+                        }
+                    ],
+                    additionalItems: false
+                }
+            ]
+        },
+
+        fixable: "code",
+
+        messages: {
+            unexpected: "Expected '{{expectedOperator}}' and instead saw '{{actualOperator}}'."
+        }
+    },
+
+    create(context) {
+        const config = context.options[0] || "always";
+        const options = context.options[1] || {};
+        const sourceCode = context.getSourceCode();
+
+        const nullOption = (config === "always")
+            ? options.null || "always"
+            : "ignore";
+        const enforceRuleForNull = (nullOption === "always");
+        const enforceInverseRuleForNull = (nullOption === "never");
+
+        /**
+         * Checks if an expression is a typeof expression
+         * @param  {ASTNode} node The node to check
+         * @returns {boolean} if the node is a typeof expression
+         */
+        function isTypeOf(node) {
+            return node.type === "UnaryExpression" && node.operator === "typeof";
+        }
+
+        /**
+         * Checks if either operand of a binary expression is a typeof operation
+         * @param {ASTNode} node The node to check
+         * @returns {boolean} if one of the operands is typeof
+         * @private
+         */
+        function isTypeOfBinary(node) {
+            return isTypeOf(node.left) || isTypeOf(node.right);
+        }
+
+        /**
+         * Checks if operands are literals of the same type (via typeof)
+         * @param {ASTNode} node The node to check
+         * @returns {boolean} if operands are of same type
+         * @private
+         */
+        function areLiteralsAndSameType(node) {
+            return node.left.type === "Literal" && node.right.type === "Literal" &&
+                    typeof node.left.value === typeof node.right.value;
+        }
+
+        /**
+         * Checks if one of the operands is a literal null
+         * @param {ASTNode} node The node to check
+         * @returns {boolean} if operands are null
+         * @private
+         */
+        function isNullCheck(node) {
+            return astUtils.isNullLiteral(node.right) || astUtils.isNullLiteral(node.left);
+        }
+
+        /**
+         * Reports a message for this rule.
+         * @param {ASTNode} node The binary expression node that was checked
+         * @param {string} expectedOperator The operator that was expected (either '==', '!=', '===', or '!==')
+         * @returns {void}
+         * @private
+         */
+        function report(node, expectedOperator) {
+            const operatorToken = sourceCode.getFirstTokenBetween(
+                node.left,
+                node.right,
+                token => token.value === node.operator
+            );
+
+            context.report({
+                node,
+                loc: operatorToken.loc,
+                messageId: "unexpected",
+                data: { expectedOperator, actualOperator: node.operator },
+                fix(fixer) {
+
+                    // If the comparison is a `typeof` comparison or both sides are literals with the same type, then it's safe to fix.
+                    if (isTypeOfBinary(node) || areLiteralsAndSameType(node)) {
+                        return fixer.replaceText(operatorToken, expectedOperator);
+                    }
+                    return null;
+                }
+            });
+        }
+
+        return {
+            BinaryExpression(node) {
+                const isNull = isNullCheck(node);
+
+                if (node.operator !== "==" && node.operator !== "!=") {
+                    if (enforceInverseRuleForNull && isNull) {
+                        report(node, node.operator.slice(0, -1));
+                    }
+                    return;
+                }
+
+                if (config === "smart" && (isTypeOfBinary(node) ||
+                        areLiteralsAndSameType(node) || isNull)) {
+                    return;
+                }
+
+                if (!enforceRuleForNull && isNull) {
+                    return;
+                }
+
+                report(node, `${node.operator}=`);
+            }
+        };
+
+    }
+};

node_modules/eslint/lib/rules/for-direction.js

@@ -0,0 +1,126 @@
+/**
+ * @fileoverview enforce "for" loop update clause moving the counter in the right direction.(for-direction)
+ * @author Aladdin-ADD<hh_2013@foxmail.com>
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "problem",
+
+        docs: {
+            description: "enforce \"for\" loop update clause moving the counter in the right direction.",
+            category: "Possible Errors",
+            recommended: true,
+            url: "https://eslint.org/docs/rules/for-direction"
+        },
+
+        fixable: null,
+        schema: [],
+
+        messages: {
+            incorrectDirection: "The update clause in this loop moves the variable in the wrong direction."
+        }
+    },
+
+    create(context) {
+
+        /**
+         * report an error.
+         * @param {ASTNode} node the node to report.
+         * @returns {void}
+         */
+        function report(node) {
+            context.report({
+                node,
+                messageId: "incorrectDirection"
+            });
+        }
+
+        /**
+         * check the right side of the assignment
+         * @param {ASTNode} update UpdateExpression to check
+         * @param {int} dir expected direction that could either be turned around or invalidated
+         * @returns {int} return dir, the negated dir or zero if it's not clear for identifiers
+         */
+        function getRightDirection(update, dir) {
+            if (update.right.type === "UnaryExpression") {
+                if (update.right.operator === "-") {
+                    return -dir;
+                }
+            } else if (update.right.type === "Identifier") {
+                return 0;
+            }
+            return dir;
+        }
+
+        /**
+         * check UpdateExpression add/sub the counter
+         * @param {ASTNode} update UpdateExpression to check
+         * @param {string} counter variable name to check
+         * @returns {int} if add return 1, if sub return -1, if nochange, return 0
+         */
+        function getUpdateDirection(update, counter) {
+            if (update.argument.type === "Identifier" && update.argument.name === counter) {
+                if (update.operator === "++") {
+                    return 1;
+                }
+                if (update.operator === "--") {
+                    return -1;
+                }
+            }
+            return 0;
+        }
+
+        /**
+         * check AssignmentExpression add/sub the counter
+         * @param {ASTNode} update AssignmentExpression to check
+         * @param {string} counter variable name to check
+         * @returns {int} if add return 1, if sub return -1, if nochange, return 0
+         */
+        function getAssignmentDirection(update, counter) {
+            if (update.left.name === counter) {
+                if (update.operator === "+=") {
+                    return getRightDirection(update, 1);
+                }
+                if (update.operator === "-=") {
+                    return getRightDirection(update, -1);
+                }
+            }
+            return 0;
+        }
+        return {
+            ForStatement(node) {
+
+                if (node.test && node.test.type === "BinaryExpression" && node.test.left.type === "Identifier" && node.update) {
+                    const counter = node.test.left.name;
+                    const operator = node.test.operator;
+                    const update = node.update;
+
+                    let wrongDirection;
+
+                    if (operator === "<" || operator === "<=") {
+                        wrongDirection = -1;
+                    } else if (operator === ">" || operator === ">=") {
+                        wrongDirection = 1;
+                    } else {
+                        return;
+                    }
+
+                    if (update.type === "UpdateExpression") {
+                        if (getUpdateDirection(update, counter) === wrongDirection) {
+                            report(node);
+                        }
+                    } else if (update.type === "AssignmentExpression" && getAssignmentDirection(update, counter) === wrongDirection) {
+                        report(node);
+                    }
+                }
+            }
+        };
+    }
+};

node_modules/eslint/lib/rules/func-call-spacing.js

@@ -0,0 +1,230 @@
+/**
+ * @fileoverview Rule to control spacing within function calls
+ * @author Matt DuVall <http://www.mattduvall.com>
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "require or disallow spacing between function identifiers and their invocations",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/func-call-spacing"
+        },
+
+        fixable: "whitespace",
+
+        schema: {
+            anyOf: [
+                {
+                    type: "array",
+                    items: [
+                        {
+                            enum: ["never"]
+                        }
+                    ],
+                    minItems: 0,
+                    maxItems: 1
+                },
+                {
+                    type: "array",
+                    items: [
+                        {
+                            enum: ["always"]
+                        },
+                        {
+                            type: "object",
+                            properties: {
+                                allowNewlines: {
+                                    type: "boolean"
+                                }
+                            },
+                            additionalProperties: false
+                        }
+                    ],
+                    minItems: 0,
+                    maxItems: 2
+                }
+            ]
+        },
+
+        messages: {
+            unexpectedWhitespace: "Unexpected whitespace between function name and paren.",
+            unexpectedNewline: "Unexpected newline between function name and paren.",
+            missing: "Missing space between function name and paren."
+        }
+    },
+
+    create(context) {
+
+        const never = context.options[0] !== "always";
+        const allowNewlines = !never && context.options[1] && context.options[1].allowNewlines;
+        const sourceCode = context.getSourceCode();
+        const text = sourceCode.getText();
+
+        /**
+         * Check if open space is present in a function name
+         * @param {ASTNode} node node to evaluate
+         * @param {Token} leftToken The last token of the callee. This may be the closing parenthesis that encloses the callee.
+         * @param {Token} rightToken Tha first token of the arguments. this is the opening parenthesis that encloses the arguments.
+         * @returns {void}
+         * @private
+         */
+        function checkSpacing(node, leftToken, rightToken) {
+            const textBetweenTokens = text.slice(leftToken.range[1], rightToken.range[0]).replace(/\/\*.*?\*\//gu, "");
+            const hasWhitespace = /\s/u.test(textBetweenTokens);
+            const hasNewline = hasWhitespace && astUtils.LINEBREAK_MATCHER.test(textBetweenTokens);
+
+            /*
+             * never allowNewlines hasWhitespace hasNewline message
+             * F     F             F             F          Missing space between function name and paren.
+             * F     F             F             T          (Invalid `!hasWhitespace && hasNewline`)
+             * F     F             T             T          Unexpected newline between function name and paren.
+             * F     F             T             F          (OK)
+             * F     T             T             F          (OK)
+             * F     T             T             T          (OK)
+             * F     T             F             T          (Invalid `!hasWhitespace && hasNewline`)
+             * F     T             F             F          Missing space between function name and paren.
+             * T     T             F             F          (Invalid `never && allowNewlines`)
+             * T     T             F             T          (Invalid `!hasWhitespace && hasNewline`)
+             * T     T             T             T          (Invalid `never && allowNewlines`)
+             * T     T             T             F          (Invalid `never && allowNewlines`)
+             * T     F             T             F          Unexpected space between function name and paren.
+             * T     F             T             T          Unexpected space between function name and paren.
+             * T     F             F             T          (Invalid `!hasWhitespace && hasNewline`)
+             * T     F             F             F          (OK)
+             *
+             * T                   T                        Unexpected space between function name and paren.
+             * F                   F                        Missing space between function name and paren.
+             * F     F                           T          Unexpected newline between function name and paren.
+             */
+
+            if (never && hasWhitespace) {
+                context.report({
+                    node,
+                    loc: {
+                        start: leftToken.loc.end,
+                        end: {
+                            line: rightToken.loc.start.line,
+                            column: rightToken.loc.start.column - 1
+                        }
+                    },
+                    messageId: "unexpectedWhitespace",
+                    fix(fixer) {
+
+                        // Don't remove comments.
+                        if (sourceCode.commentsExistBetween(leftToken, rightToken)) {
+                            return null;
+                        }
+
+                        // If `?.` exists, it doesn't hide no-unexpected-multiline errors
+                        if (node.optional) {
+                            return fixer.replaceTextRange([leftToken.range[1], rightToken.range[0]], "?.");
+                        }
+
+                        /*
+                         * Only autofix if there is no newline
+                         * https://github.com/eslint/eslint/issues/7787
+                         */
+                        if (hasNewline) {
+                            return null;
+                        }
+                        return fixer.removeRange([leftToken.range[1], rightToken.range[0]]);
+                    }
+                });
+            } else if (!never && !hasWhitespace) {
+                context.report({
+                    node,
+                    loc: {
+                        start: {
+                            line: leftToken.loc.end.line,
+                            column: leftToken.loc.end.column - 1
+                        },
+                        end: rightToken.loc.start
+                    },
+                    messageId: "missing",
+                    fix(fixer) {
+                        if (node.optional) {
+                            return null; // Not sure if inserting a space to either before/after `?.` token.
+                        }
+                        return fixer.insertTextBefore(rightToken, " ");
+                    }
+                });
+            } else if (!never && !allowNewlines && hasNewline) {
+                context.report({
+                    node,
+                    loc: {
+                        start: leftToken.loc.end,
+                        end: rightToken.loc.start
+                    },
+                    messageId: "unexpectedNewline",
+                    fix(fixer) {
+
+                        /*
+                         * Only autofix if there is no newline
+                         * https://github.com/eslint/eslint/issues/7787
+                         * But if `?.` exists, it doesn't hide no-unexpected-multiline errors
+                         */
+                        if (!node.optional) {
+                            return null;
+                        }
+
+                        // Don't remove comments.
+                        if (sourceCode.commentsExistBetween(leftToken, rightToken)) {
+                            return null;
+                        }
+
+                        const range = [leftToken.range[1], rightToken.range[0]];
+                        const qdToken = sourceCode.getTokenAfter(leftToken);
+
+                        if (qdToken.range[0] === leftToken.range[1]) {
+                            return fixer.replaceTextRange(range, "?. ");
+                        }
+                        if (qdToken.range[1] === rightToken.range[0]) {
+                            return fixer.replaceTextRange(range, " ?.");
+                        }
+                        return fixer.replaceTextRange(range, " ?. ");
+                    }
+                });
+            }
+        }
+
+        return {
+            "CallExpression, NewExpression"(node) {
+                const lastToken = sourceCode.getLastToken(node);
+                const lastCalleeToken = sourceCode.getLastToken(node.callee);
+                const parenToken = sourceCode.getFirstTokenBetween(lastCalleeToken, lastToken, astUtils.isOpeningParenToken);
+                const prevToken = parenToken && sourceCode.getTokenBefore(parenToken, astUtils.isNotQuestionDotToken);
+
+                // Parens in NewExpression are optional
+                if (!(parenToken && parenToken.range[1] < node.range[1])) {
+                    return;
+                }
+
+                checkSpacing(node, prevToken, parenToken);
+            },
+
+            ImportExpression(node) {
+                const leftToken = sourceCode.getFirstToken(node);
+                const rightToken = sourceCode.getTokenAfter(leftToken);
+
+                checkSpacing(node, leftToken, rightToken);
+            }
+        };
+
+    }
+};

node_modules/eslint/lib/rules/func-name-matching.js

@@ -0,0 +1,249 @@
+/**
+ * @fileoverview Rule to require function names to match the name of the variable or property to which they are assigned.
+ * @author Annie Zhang, Pavel Strashkin
+ */
+
+"use strict";
+
+//--------------------------------------------------------------------------
+// Requirements
+//--------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+const esutils = require("esutils");
+
+//--------------------------------------------------------------------------
+// Helpers
+//--------------------------------------------------------------------------
+
+/**
+ * Determines if a pattern is `module.exports` or `module["exports"]`
+ * @param {ASTNode} pattern The left side of the AssignmentExpression
+ * @returns {boolean} True if the pattern is `module.exports` or `module["exports"]`
+ */
+function isModuleExports(pattern) {
+    if (pattern.type === "MemberExpression" && pattern.object.type === "Identifier" && pattern.object.name === "module") {
+
+        // module.exports
+        if (pattern.property.type === "Identifier" && pattern.property.name === "exports") {
+            return true;
+        }
+
+        // module["exports"]
+        if (pattern.property.type === "Literal" && pattern.property.value === "exports") {
+            return true;
+        }
+    }
+    return false;
+}
+
+/**
+ * Determines if a string name is a valid identifier
+ * @param {string} name The string to be checked
+ * @param {int} ecmaVersion The ECMAScript version if specified in the parserOptions config
+ * @returns {boolean} True if the string is a valid identifier
+ */
+function isIdentifier(name, ecmaVersion) {
+    if (ecmaVersion >= 6) {
+        return esutils.keyword.isIdentifierES6(name);
+    }
+    return esutils.keyword.isIdentifierES5(name);
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+const alwaysOrNever = { enum: ["always", "never"] };
+const optionsObject = {
+    type: "object",
+    properties: {
+        considerPropertyDescriptor: {
+            type: "boolean"
+        },
+        includeCommonJSModuleExports: {
+            type: "boolean"
+        }
+    },
+    additionalProperties: false
+};
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "require function names to match the name of the variable or property to which they are assigned",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/func-name-matching"
+        },
+
+        schema: {
+            anyOf: [{
+                type: "array",
+                additionalItems: false,
+                items: [alwaysOrNever, optionsObject]
+            }, {
+                type: "array",
+                additionalItems: false,
+                items: [optionsObject]
+            }]
+        },
+
+        messages: {
+            matchProperty: "Function name `{{funcName}}` should match property name `{{name}}`.",
+            matchVariable: "Function name `{{funcName}}` should match variable name `{{name}}`.",
+            notMatchProperty: "Function name `{{funcName}}` should not match property name `{{name}}`.",
+            notMatchVariable: "Function name `{{funcName}}` should not match variable name `{{name}}`."
+        }
+    },
+
+    create(context) {
+        const options = (typeof context.options[0] === "object" ? context.options[0] : context.options[1]) || {};
+        const nameMatches = typeof context.options[0] === "string" ? context.options[0] : "always";
+        const considerPropertyDescriptor = options.considerPropertyDescriptor;
+        const includeModuleExports = options.includeCommonJSModuleExports;
+        const ecmaVersion = context.parserOptions && context.parserOptions.ecmaVersion ? context.parserOptions.ecmaVersion : 5;
+
+        /**
+         * Check whether node is a certain CallExpression.
+         * @param {string} objName object name
+         * @param {string} funcName function name
+         * @param {ASTNode} node The node to check
+         * @returns {boolean} `true` if node matches CallExpression
+         */
+        function isPropertyCall(objName, funcName, node) {
+            if (!node) {
+                return false;
+            }
+            return node.type === "CallExpression" && astUtils.isSpecificMemberAccess(node.callee, objName, funcName);
+        }
+
+        /**
+         * Compares identifiers based on the nameMatches option
+         * @param {string} x the first identifier
+         * @param {string} y the second identifier
+         * @returns {boolean} whether the two identifiers should warn.
+         */
+        function shouldWarn(x, y) {
+            return (nameMatches === "always" && x !== y) || (nameMatches === "never" && x === y);
+        }
+
+        /**
+         * Reports
+         * @param {ASTNode} node The node to report
+         * @param {string} name The variable or property name
+         * @param {string} funcName The function name
+         * @param {boolean} isProp True if the reported node is a property assignment
+         * @returns {void}
+         */
+        function report(node, name, funcName, isProp) {
+            let messageId;
+
+            if (nameMatches === "always" && isProp) {
+                messageId = "matchProperty";
+            } else if (nameMatches === "always") {
+                messageId = "matchVariable";
+            } else if (isProp) {
+                messageId = "notMatchProperty";
+            } else {
+                messageId = "notMatchVariable";
+            }
+            context.report({
+                node,
+                messageId,
+                data: {
+                    name,
+                    funcName
+                }
+            });
+        }
+
+        /**
+         * Determines whether a given node is a string literal
+         * @param {ASTNode} node The node to check
+         * @returns {boolean} `true` if the node is a string literal
+         */
+        function isStringLiteral(node) {
+            return node.type === "Literal" && typeof node.value === "string";
+        }
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+            VariableDeclarator(node) {
+                if (!node.init || node.init.type !== "FunctionExpression" || node.id.type !== "Identifier") {
+                    return;
+                }
+                if (node.init.id && shouldWarn(node.id.name, node.init.id.name)) {
+                    report(node, node.id.name, node.init.id.name, false);
+                }
+            },
+
+            AssignmentExpression(node) {
+                if (
+                    node.right.type !== "FunctionExpression" ||
+                    (node.left.computed && node.left.property.type !== "Literal") ||
+                    (!includeModuleExports && isModuleExports(node.left)) ||
+                    (node.left.type !== "Identifier" && node.left.type !== "MemberExpression")
+                ) {
+                    return;
+                }
+
+                const isProp = node.left.type === "MemberExpression";
+                const name = isProp ? astUtils.getStaticPropertyName(node.left) : node.left.name;
+
+                if (node.right.id && isIdentifier(name) && shouldWarn(name, node.right.id.name)) {
+                    report(node, name, node.right.id.name, isProp);
+                }
+            },
+
+            Property(node) {
+                if (node.value.type !== "FunctionExpression" || !node.value.id || node.computed && !isStringLiteral(node.key)) {
+                    return;
+                }
+
+                if (node.key.type === "Identifier") {
+                    const functionName = node.value.id.name;
+                    let propertyName = node.key.name;
+
+                    if (considerPropertyDescriptor && propertyName === "value") {
+                        if (isPropertyCall("Object", "defineProperty", node.parent.parent) || isPropertyCall("Reflect", "defineProperty", node.parent.parent)) {
+                            const property = node.parent.parent.arguments[1];
+
+                            if (isStringLiteral(property) && shouldWarn(property.value, functionName)) {
+                                report(node, property.value, functionName, true);
+                            }
+                        } else if (isPropertyCall("Object", "defineProperties", node.parent.parent.parent.parent)) {
+                            propertyName = node.parent.parent.key.name;
+                            if (!node.parent.parent.computed && shouldWarn(propertyName, functionName)) {
+                                report(node, propertyName, functionName, true);
+                            }
+                        } else if (isPropertyCall("Object", "create", node.parent.parent.parent.parent)) {
+                            propertyName = node.parent.parent.key.name;
+                            if (!node.parent.parent.computed && shouldWarn(propertyName, functionName)) {
+                                report(node, propertyName, functionName, true);
+                            }
+                        } else if (shouldWarn(propertyName, functionName)) {
+                            report(node, propertyName, functionName, true);
+                        }
+                    } else if (shouldWarn(propertyName, functionName)) {
+                        report(node, propertyName, functionName, true);
+                    }
+                    return;
+                }
+
+                if (
+                    isStringLiteral(node.key) &&
+                    isIdentifier(node.key.value, ecmaVersion) &&
+                    shouldWarn(node.key.value, node.value.id.name)
+                ) {
+                    report(node, node.key.value, node.value.id.name, true);
+                }
+            }
+        };
+    }
+};

node_modules/eslint/lib/rules/func-names.js

@@ -0,0 +1,190 @@
+/**
+ * @fileoverview Rule to warn when a function expression does not have a name.
+ * @author Kyle T. Nunery
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+/**
+ * Checks whether or not a given variable is a function name.
+ * @param {eslint-scope.Variable} variable A variable to check.
+ * @returns {boolean} `true` if the variable is a function name.
+ */
+function isFunctionName(variable) {
+    return variable && variable.defs[0].type === "FunctionName";
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "require or disallow named `function` expressions",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/func-names"
+        },
+
+        schema: {
+            definitions: {
+                value: {
+                    enum: [
+                        "always",
+                        "as-needed",
+                        "never"
+                    ]
+                }
+            },
+            items: [
+                {
+                    $ref: "#/definitions/value"
+                },
+                {
+                    type: "object",
+                    properties: {
+                        generators: {
+                            $ref: "#/definitions/value"
+                        }
+                    },
+                    additionalProperties: false
+                }
+            ]
+        },
+
+        messages: {
+            unnamed: "Unexpected unnamed {{name}}.",
+            named: "Unexpected named {{name}}."
+        }
+    },
+
+    create(context) {
+
+        const sourceCode = context.getSourceCode();
+
+        /**
+         * Returns the config option for the given node.
+         * @param {ASTNode} node A node to get the config for.
+         * @returns {string} The config option.
+         */
+        function getConfigForNode(node) {
+            if (
+                node.generator &&
+                context.options.length > 1 &&
+                context.options[1].generators
+            ) {
+                return context.options[1].generators;
+            }
+
+            return context.options[0] || "always";
+        }
+
+        /**
+         * Determines whether the current FunctionExpression node is a get, set, or
+         * shorthand method in an object literal or a class.
+         * @param {ASTNode} node A node to check.
+         * @returns {boolean} True if the node is a get, set, or shorthand method.
+         */
+        function isObjectOrClassMethod(node) {
+            const parent = node.parent;
+
+            return (parent.type === "MethodDefinition" || (
+                parent.type === "Property" && (
+                    parent.method ||
+                    parent.kind === "get" ||
+                    parent.kind === "set"
+                )
+            ));
+        }
+
+        /**
+         * Determines whether the current FunctionExpression node has a name that would be
+         * inferred from context in a conforming ES6 environment.
+         * @param {ASTNode} node A node to check.
+         * @returns {boolean} True if the node would have a name assigned automatically.
+         */
+        function hasInferredName(node) {
+            const parent = node.parent;
+
+            return isObjectOrClassMethod(node) ||
+                (parent.type === "VariableDeclarator" && parent.id.type === "Identifier" && parent.init === node) ||
+                (parent.type === "Property" && parent.value === node) ||
+                (parent.type === "AssignmentExpression" && parent.left.type === "Identifier" && parent.right === node) ||
+                (parent.type === "AssignmentPattern" && parent.left.type === "Identifier" && parent.right === node);
+        }
+
+        /**
+         * Reports that an unnamed function should be named
+         * @param {ASTNode} node The node to report in the event of an error.
+         * @returns {void}
+         */
+        function reportUnexpectedUnnamedFunction(node) {
+            context.report({
+                node,
+                messageId: "unnamed",
+                loc: astUtils.getFunctionHeadLoc(node, sourceCode),
+                data: { name: astUtils.getFunctionNameWithKind(node) }
+            });
+        }
+
+        /**
+         * Reports that a named function should be unnamed
+         * @param {ASTNode} node The node to report in the event of an error.
+         * @returns {void}
+         */
+        function reportUnexpectedNamedFunction(node) {
+            context.report({
+                node,
+                messageId: "named",
+                loc: astUtils.getFunctionHeadLoc(node, sourceCode),
+                data: { name: astUtils.getFunctionNameWithKind(node) }
+            });
+        }
+
+        /**
+         * The listener for function nodes.
+         * @param {ASTNode} node function node
+         * @returns {void}
+         */
+        function handleFunction(node) {
+
+            // Skip recursive functions.
+            const nameVar = context.getDeclaredVariables(node)[0];
+
+            if (isFunctionName(nameVar) && nameVar.references.length > 0) {
+                return;
+            }
+
+            const hasName = Boolean(node.id && node.id.name);
+            const config = getConfigForNode(node);
+
+            if (config === "never") {
+                if (hasName && node.type !== "FunctionDeclaration") {
+                    reportUnexpectedNamedFunction(node);
+                }
+            } else if (config === "as-needed") {
+                if (!hasName && !hasInferredName(node)) {
+                    reportUnexpectedUnnamedFunction(node);
+                }
+            } else {
+                if (!hasName && !isObjectOrClassMethod(node)) {
+                    reportUnexpectedUnnamedFunction(node);
+                }
+            }
+        }
+
+        return {
+            "FunctionExpression:exit": handleFunction,
+            "ExportDefaultDeclaration > FunctionDeclaration": handleFunction
+        };
+    }
+};

node_modules/eslint/lib/rules/func-style.js

@@ -0,0 +1,98 @@
+/**
+ * @fileoverview Rule to enforce a particular function style
+ * @author Nicholas C. Zakas
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "enforce the consistent use of either `function` declarations or expressions",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/func-style"
+        },
+
+        schema: [
+            {
+                enum: ["declaration", "expression"]
+            },
+            {
+                type: "object",
+                properties: {
+                    allowArrowFunctions: {
+                        type: "boolean",
+                        default: false
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+
+        messages: {
+            expression: "Expected a function expression.",
+            declaration: "Expected a function declaration."
+        }
+    },
+
+    create(context) {
+
+        const style = context.options[0],
+            allowArrowFunctions = context.options[1] && context.options[1].allowArrowFunctions,
+            enforceDeclarations = (style === "declaration"),
+            stack = [];
+
+        const nodesToCheck = {
+            FunctionDeclaration(node) {
+                stack.push(false);
+
+                if (!enforceDeclarations && node.parent.type !== "ExportDefaultDeclaration") {
+                    context.report({ node, messageId: "expression" });
+                }
+            },
+            "FunctionDeclaration:exit"() {
+                stack.pop();
+            },
+
+            FunctionExpression(node) {
+                stack.push(false);
+
+                if (enforceDeclarations && node.parent.type === "VariableDeclarator") {
+                    context.report({ node: node.parent, messageId: "declaration" });
+                }
+            },
+            "FunctionExpression:exit"() {
+                stack.pop();
+            },
+
+            ThisExpression() {
+                if (stack.length > 0) {
+                    stack[stack.length - 1] = true;
+                }
+            }
+        };
+
+        if (!allowArrowFunctions) {
+            nodesToCheck.ArrowFunctionExpression = function() {
+                stack.push(false);
+            };
+
+            nodesToCheck["ArrowFunctionExpression:exit"] = function(node) {
+                const hasThisExpr = stack.pop();
+
+                if (enforceDeclarations && !hasThisExpr && node.parent.type === "VariableDeclarator") {
+                    context.report({ node: node.parent, messageId: "declaration" });
+                }
+            };
+        }
+
+        return nodesToCheck;
+
+    }
+};

node_modules/eslint/lib/rules/function-call-argument-newline.js

@@ -0,0 +1,122 @@
+/**
+ * @fileoverview Rule to enforce line breaks between arguments of a function call
+ * @author Alexey Gonchar <https://github.com/finico>
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce line breaks between arguments of a function call",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/function-call-argument-newline"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                enum: ["always", "never", "consistent"]
+            }
+        ],
+
+        messages: {
+            unexpectedLineBreak: "There should be no line break here.",
+            missingLineBreak: "There should be a line break after this argument."
+        }
+    },
+
+    create(context) {
+        const sourceCode = context.getSourceCode();
+
+        const checkers = {
+            unexpected: {
+                messageId: "unexpectedLineBreak",
+                check: (prevToken, currentToken) => prevToken.loc.end.line !== currentToken.loc.start.line,
+                createFix: (token, tokenBefore) => fixer =>
+                    fixer.replaceTextRange([tokenBefore.range[1], token.range[0]], " ")
+            },
+            missing: {
+                messageId: "missingLineBreak",
+                check: (prevToken, currentToken) => prevToken.loc.end.line === currentToken.loc.start.line,
+                createFix: (token, tokenBefore) => fixer =>
+                    fixer.replaceTextRange([tokenBefore.range[1], token.range[0]], "\n")
+            }
+        };
+
+        /**
+         * Check all arguments for line breaks in the CallExpression
+         * @param {CallExpression} node node to evaluate
+         * @param {{ messageId: string, check: Function }} checker selected checker
+         * @returns {void}
+         * @private
+         */
+        function checkArguments(node, checker) {
+            for (let i = 1; i < node.arguments.length; i++) {
+                const prevArgToken = sourceCode.getLastToken(node.arguments[i - 1]);
+                const currentArgToken = sourceCode.getFirstToken(node.arguments[i]);
+
+                if (checker.check(prevArgToken, currentArgToken)) {
+                    const tokenBefore = sourceCode.getTokenBefore(
+                        currentArgToken,
+                        { includeComments: true }
+                    );
+
+                    const hasLineCommentBefore = tokenBefore.type === "Line";
+
+                    context.report({
+                        node,
+                        loc: {
+                            start: tokenBefore.loc.end,
+                            end: currentArgToken.loc.start
+                        },
+                        messageId: checker.messageId,
+                        fix: hasLineCommentBefore ? null : checker.createFix(currentArgToken, tokenBefore)
+                    });
+                }
+            }
+        }
+
+        /**
+         * Check if open space is present in a function name
+         * @param {CallExpression} node node to evaluate
+         * @returns {void}
+         * @private
+         */
+        function check(node) {
+            if (node.arguments.length < 2) {
+                return;
+            }
+
+            const option = context.options[0] || "always";
+
+            if (option === "never") {
+                checkArguments(node, checkers.unexpected);
+            } else if (option === "always") {
+                checkArguments(node, checkers.missing);
+            } else if (option === "consistent") {
+                const firstArgToken = sourceCode.getLastToken(node.arguments[0]);
+                const secondArgToken = sourceCode.getFirstToken(node.arguments[1]);
+
+                if (firstArgToken.loc.end.line === secondArgToken.loc.start.line) {
+                    checkArguments(node, checkers.unexpected);
+                } else {
+                    checkArguments(node, checkers.missing);
+                }
+            }
+        }
+
+        return {
+            CallExpression: check,
+            NewExpression: check
+        };
+    }
+};

node_modules/eslint/lib/rules/function-paren-newline.js

@@ -0,0 +1,281 @@
+/**
+ * @fileoverview enforce consistent line breaks inside function parentheses
+ * @author Teddy Katz
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce consistent line breaks inside function parentheses",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/function-paren-newline"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                oneOf: [
+                    {
+                        enum: ["always", "never", "consistent", "multiline", "multiline-arguments"]
+                    },
+                    {
+                        type: "object",
+                        properties: {
+                            minItems: {
+                                type: "integer",
+                                minimum: 0
+                            }
+                        },
+                        additionalProperties: false
+                    }
+                ]
+            }
+        ],
+
+        messages: {
+            expectedBefore: "Expected newline before ')'.",
+            expectedAfter: "Expected newline after '('.",
+            expectedBetween: "Expected newline between arguments/params.",
+            unexpectedBefore: "Unexpected newline before ')'.",
+            unexpectedAfter: "Unexpected newline after '('."
+        }
+    },
+
+    create(context) {
+        const sourceCode = context.getSourceCode();
+        const rawOption = context.options[0] || "multiline";
+        const multilineOption = rawOption === "multiline";
+        const multilineArgumentsOption = rawOption === "multiline-arguments";
+        const consistentOption = rawOption === "consistent";
+        let minItems;
+
+        if (typeof rawOption === "object") {
+            minItems = rawOption.minItems;
+        } else if (rawOption === "always") {
+            minItems = 0;
+        } else if (rawOption === "never") {
+            minItems = Infinity;
+        } else {
+            minItems = null;
+        }
+
+        //----------------------------------------------------------------------
+        // Helpers
+        //----------------------------------------------------------------------
+
+        /**
+         * Determines whether there should be newlines inside function parens
+         * @param {ASTNode[]} elements The arguments or parameters in the list
+         * @param {boolean} hasLeftNewline `true` if the left paren has a newline in the current code.
+         * @returns {boolean} `true` if there should be newlines inside the function parens
+         */
+        function shouldHaveNewlines(elements, hasLeftNewline) {
+            if (multilineArgumentsOption && elements.length === 1) {
+                return hasLeftNewline;
+            }
+            if (multilineOption || multilineArgumentsOption) {
+                return elements.some((element, index) => index !== elements.length - 1 && element.loc.end.line !== elements[index + 1].loc.start.line);
+            }
+            if (consistentOption) {
+                return hasLeftNewline;
+            }
+            return elements.length >= minItems;
+        }
+
+        /**
+         * Validates parens
+         * @param {Object} parens An object with keys `leftParen` for the left paren token, and `rightParen` for the right paren token
+         * @param {ASTNode[]} elements The arguments or parameters in the list
+         * @returns {void}
+         */
+        function validateParens(parens, elements) {
+            const leftParen = parens.leftParen;
+            const rightParen = parens.rightParen;
+            const tokenAfterLeftParen = sourceCode.getTokenAfter(leftParen);
+            const tokenBeforeRightParen = sourceCode.getTokenBefore(rightParen);
+            const hasLeftNewline = !astUtils.isTokenOnSameLine(leftParen, tokenAfterLeftParen);
+            const hasRightNewline = !astUtils.isTokenOnSameLine(tokenBeforeRightParen, rightParen);
+            const needsNewlines = shouldHaveNewlines(elements, hasLeftNewline);
+
+            if (hasLeftNewline && !needsNewlines) {
+                context.report({
+                    node: leftParen,
+                    messageId: "unexpectedAfter",
+                    fix(fixer) {
+                        return sourceCode.getText().slice(leftParen.range[1], tokenAfterLeftParen.range[0]).trim()
+
+                            // If there is a comment between the ( and the first element, don't do a fix.
+                            ? null
+                            : fixer.removeRange([leftParen.range[1], tokenAfterLeftParen.range[0]]);
+                    }
+                });
+            } else if (!hasLeftNewline && needsNewlines) {
+                context.report({
+                    node: leftParen,
+                    messageId: "expectedAfter",
+                    fix: fixer => fixer.insertTextAfter(leftParen, "\n")
+                });
+            }
+
+            if (hasRightNewline && !needsNewlines) {
+                context.report({
+                    node: rightParen,
+                    messageId: "unexpectedBefore",
+                    fix(fixer) {
+                        return sourceCode.getText().slice(tokenBeforeRightParen.range[1], rightParen.range[0]).trim()
+
+                            // If there is a comment between the last element and the ), don't do a fix.
+                            ? null
+                            : fixer.removeRange([tokenBeforeRightParen.range[1], rightParen.range[0]]);
+                    }
+                });
+            } else if (!hasRightNewline && needsNewlines) {
+                context.report({
+                    node: rightParen,
+                    messageId: "expectedBefore",
+                    fix: fixer => fixer.insertTextBefore(rightParen, "\n")
+                });
+            }
+        }
+
+        /**
+         * Validates a list of arguments or parameters
+         * @param {Object} parens An object with keys `leftParen` for the left paren token, and `rightParen` for the right paren token
+         * @param {ASTNode[]} elements The arguments or parameters in the list
+         * @returns {void}
+         */
+        function validateArguments(parens, elements) {
+            const leftParen = parens.leftParen;
+            const tokenAfterLeftParen = sourceCode.getTokenAfter(leftParen);
+            const hasLeftNewline = !astUtils.isTokenOnSameLine(leftParen, tokenAfterLeftParen);
+            const needsNewlines = shouldHaveNewlines(elements, hasLeftNewline);
+
+            for (let i = 0; i <= elements.length - 2; i++) {
+                const currentElement = elements[i];
+                const nextElement = elements[i + 1];
+                const hasNewLine = currentElement.loc.end.line !== nextElement.loc.start.line;
+
+                if (!hasNewLine && needsNewlines) {
+                    context.report({
+                        node: currentElement,
+                        messageId: "expectedBetween",
+                        fix: fixer => fixer.insertTextBefore(nextElement, "\n")
+                    });
+                }
+            }
+        }
+
+        /**
+         * Gets the left paren and right paren tokens of a node.
+         * @param {ASTNode} node The node with parens
+         * @returns {Object} An object with keys `leftParen` for the left paren token, and `rightParen` for the right paren token.
+         * Can also return `null` if an expression has no parens (e.g. a NewExpression with no arguments, or an ArrowFunctionExpression
+         * with a single parameter)
+         */
+        function getParenTokens(node) {
+            switch (node.type) {
+                case "NewExpression":
+                    if (!node.arguments.length && !(
+                        astUtils.isOpeningParenToken(sourceCode.getLastToken(node, { skip: 1 })) &&
+                        astUtils.isClosingParenToken(sourceCode.getLastToken(node))
+                    )) {
+
+                        // If the NewExpression does not have parens (e.g. `new Foo`), return null.
+                        return null;
+                    }
+
+                    // falls through
+
+                case "CallExpression":
+                    return {
+                        leftParen: sourceCode.getTokenAfter(node.callee, astUtils.isOpeningParenToken),
+                        rightParen: sourceCode.getLastToken(node)
+                    };
+
+                case "FunctionDeclaration":
+                case "FunctionExpression": {
+                    const leftParen = sourceCode.getFirstToken(node, astUtils.isOpeningParenToken);
+                    const rightParen = node.params.length
+                        ? sourceCode.getTokenAfter(node.params[node.params.length - 1], astUtils.isClosingParenToken)
+                        : sourceCode.getTokenAfter(leftParen);
+
+                    return { leftParen, rightParen };
+                }
+
+                case "ArrowFunctionExpression": {
+                    const firstToken = sourceCode.getFirstToken(node, { skip: (node.async ? 1 : 0) });
+
+                    if (!astUtils.isOpeningParenToken(firstToken)) {
+
+                        // If the ArrowFunctionExpression has a single param without parens, return null.
+                        return null;
+                    }
+
+                    return {
+                        leftParen: firstToken,
+                        rightParen: sourceCode.getTokenBefore(node.body, astUtils.isClosingParenToken)
+                    };
+                }
+
+                case "ImportExpression": {
+                    const leftParen = sourceCode.getFirstToken(node, 1);
+                    const rightParen = sourceCode.getLastToken(node);
+
+                    return { leftParen, rightParen };
+                }
+
+                default:
+                    throw new TypeError(`unexpected node with type ${node.type}`);
+            }
+        }
+
+        //----------------------------------------------------------------------
+        // Public
+        //----------------------------------------------------------------------
+
+        return {
+            [[
+                "ArrowFunctionExpression",
+                "CallExpression",
+                "FunctionDeclaration",
+                "FunctionExpression",
+                "ImportExpression",
+                "NewExpression"
+            ]](node) {
+                const parens = getParenTokens(node);
+                let params;
+
+                if (node.type === "ImportExpression") {
+                    params = [node.source];
+                } else if (astUtils.isFunction(node)) {
+                    params = node.params;
+                } else {
+                    params = node.arguments;
+                }
+
+                if (parens) {
+                    validateParens(parens, params);
+
+                    if (multilineArgumentsOption) {
+                        validateArguments(parens, params);
+                    }
+                }
+            }
+        };
+    }
+};

node_modules/eslint/lib/rules/generator-star-spacing.js

@@ -0,0 +1,206 @@
+/**
+ * @fileoverview Rule to check the spacing around the * in generator functions.
+ * @author Jamund Ferguson
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+const OVERRIDE_SCHEMA = {
+    oneOf: [
+        {
+            enum: ["before", "after", "both", "neither"]
+        },
+        {
+            type: "object",
+            properties: {
+                before: { type: "boolean" },
+                after: { type: "boolean" }
+            },
+            additionalProperties: false
+        }
+    ]
+};
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce consistent spacing around `*` operators in generator functions",
+            category: "ECMAScript 6",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/generator-star-spacing"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                oneOf: [
+                    {
+                        enum: ["before", "after", "both", "neither"]
+                    },
+                    {
+                        type: "object",
+                        properties: {
+                            before: { type: "boolean" },
+                            after: { type: "boolean" },
+                            named: OVERRIDE_SCHEMA,
+                            anonymous: OVERRIDE_SCHEMA,
+                            method: OVERRIDE_SCHEMA
+                        },
+                        additionalProperties: false
+                    }
+                ]
+            }
+        ],
+
+        messages: {
+            missingBefore: "Missing space before *.",
+            missingAfter: "Missing space after *.",
+            unexpectedBefore: "Unexpected space before *.",
+            unexpectedAfter: "Unexpected space after *."
+        }
+    },
+
+    create(context) {
+
+        const optionDefinitions = {
+            before: { before: true, after: false },
+            after: { before: false, after: true },
+            both: { before: true, after: true },
+            neither: { before: false, after: false }
+        };
+
+        /**
+         * Returns resolved option definitions based on an option and defaults
+         * @param {any} option The option object or string value
+         * @param {Object} defaults The defaults to use if options are not present
+         * @returns {Object} the resolved object definition
+         */
+        function optionToDefinition(option, defaults) {
+            if (!option) {
+                return defaults;
+            }
+
+            return typeof option === "string"
+                ? optionDefinitions[option]
+                : Object.assign({}, defaults, option);
+        }
+
+        const modes = (function(option) {
+            const defaults = optionToDefinition(option, optionDefinitions.before);
+
+            return {
+                named: optionToDefinition(option.named, defaults),
+                anonymous: optionToDefinition(option.anonymous, defaults),
+                method: optionToDefinition(option.method, defaults)
+            };
+        }(context.options[0] || {}));
+
+        const sourceCode = context.getSourceCode();
+
+        /**
+         * Checks if the given token is a star token or not.
+         * @param {Token} token The token to check.
+         * @returns {boolean} `true` if the token is a star token.
+         */
+        function isStarToken(token) {
+            return token.value === "*" && token.type === "Punctuator";
+        }
+
+        /**
+         * Gets the generator star token of the given function node.
+         * @param {ASTNode} node The function node to get.
+         * @returns {Token} Found star token.
+         */
+        function getStarToken(node) {
+            return sourceCode.getFirstToken(
+                (node.parent.method || node.parent.type === "MethodDefinition") ? node.parent : node,
+                isStarToken
+            );
+        }
+
+        /**
+         * capitalize a given string.
+         * @param {string} str the given string.
+         * @returns {string} the capitalized string.
+         */
+        function capitalize(str) {
+            return str[0].toUpperCase() + str.slice(1);
+        }
+
+        /**
+         * Checks the spacing between two tokens before or after the star token.
+         * @param {string} kind Either "named", "anonymous", or "method"
+         * @param {string} side Either "before" or "after".
+         * @param {Token} leftToken `function` keyword token if side is "before", or
+         *     star token if side is "after".
+         * @param {Token} rightToken Star token if side is "before", or identifier
+         *     token if side is "after".
+         * @returns {void}
+         */
+        function checkSpacing(kind, side, leftToken, rightToken) {
+            if (!!(rightToken.range[0] - leftToken.range[1]) !== modes[kind][side]) {
+                const after = leftToken.value === "*";
+                const spaceRequired = modes[kind][side];
+                const node = after ? leftToken : rightToken;
+                const messageId = `${spaceRequired ? "missing" : "unexpected"}${capitalize(side)}`;
+
+                context.report({
+                    node,
+                    messageId,
+                    fix(fixer) {
+                        if (spaceRequired) {
+                            if (after) {
+                                return fixer.insertTextAfter(node, " ");
+                            }
+                            return fixer.insertTextBefore(node, " ");
+                        }
+                        return fixer.removeRange([leftToken.range[1], rightToken.range[0]]);
+                    }
+                });
+            }
+        }
+
+        /**
+         * Enforces the spacing around the star if node is a generator function.
+         * @param {ASTNode} node A function expression or declaration node.
+         * @returns {void}
+         */
+        function checkFunction(node) {
+            if (!node.generator) {
+                return;
+            }
+
+            const starToken = getStarToken(node);
+            const prevToken = sourceCode.getTokenBefore(starToken);
+            const nextToken = sourceCode.getTokenAfter(starToken);
+
+            let kind = "named";
+
+            if (node.parent.type === "MethodDefinition" || (node.parent.type === "Property" && node.parent.method)) {
+                kind = "method";
+            } else if (!node.id) {
+                kind = "anonymous";
+            }
+
+            // Only check before when preceded by `function`|`static` keyword
+            if (!(kind === "method" && starToken === sourceCode.getFirstToken(node.parent))) {
+                checkSpacing(kind, "before", prevToken, starToken);
+            }
+
+            checkSpacing(kind, "after", starToken, nextToken);
+        }
+
+        return {
+            FunctionDeclaration: checkFunction,
+            FunctionExpression: checkFunction
+        };
+
+    }
+};

node_modules/eslint/lib/rules/getter-return.js

@@ -0,0 +1,173 @@
+/**
+ * @fileoverview Enforces that a return statement is present in property getters.
+ * @author Aladdin-ADD(hh_2013@foxmail.com)
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+const TARGET_NODE_TYPE = /^(?:Arrow)?FunctionExpression$/u;
+
+/**
+ * Checks a given code path segment is reachable.
+ * @param {CodePathSegment} segment A segment to check.
+ * @returns {boolean} `true` if the segment is reachable.
+ */
+function isReachable(segment) {
+    return segment.reachable;
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "problem",
+
+        docs: {
+            description: "enforce `return` statements in getters",
+            category: "Possible Errors",
+            recommended: true,
+            url: "https://eslint.org/docs/rules/getter-return"
+        },
+
+        fixable: null,
+
+        schema: [
+            {
+                type: "object",
+                properties: {
+                    allowImplicit: {
+                        type: "boolean",
+                        default: false
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+
+        messages: {
+            expected: "Expected to return a value in {{name}}.",
+            expectedAlways: "Expected {{name}} to always return a value."
+        }
+    },
+
+    create(context) {
+
+        const options = context.options[0] || { allowImplicit: false };
+        const sourceCode = context.getSourceCode();
+
+        let funcInfo = {
+            upper: null,
+            codePath: null,
+            hasReturn: false,
+            shouldCheck: false,
+            node: null
+        };
+
+        /**
+         * Checks whether or not the last code path segment is reachable.
+         * Then reports this function if the segment is reachable.
+         *
+         * If the last code path segment is reachable, there are paths which are not
+         * returned or thrown.
+         * @param {ASTNode} node A node to check.
+         * @returns {void}
+         */
+        function checkLastSegment(node) {
+            if (funcInfo.shouldCheck &&
+                funcInfo.codePath.currentSegments.some(isReachable)
+            ) {
+                context.report({
+                    node,
+                    loc: astUtils.getFunctionHeadLoc(node, sourceCode),
+                    messageId: funcInfo.hasReturn ? "expectedAlways" : "expected",
+                    data: {
+                        name: astUtils.getFunctionNameWithKind(funcInfo.node)
+                    }
+                });
+            }
+        }
+
+        /**
+         * Checks whether a node means a getter function.
+         * @param {ASTNode} node a node to check.
+         * @returns {boolean} if node means a getter, return true; else return false.
+         */
+        function isGetter(node) {
+            const parent = node.parent;
+
+            if (TARGET_NODE_TYPE.test(node.type) && node.body.type === "BlockStatement") {
+                if (parent.kind === "get") {
+                    return true;
+                }
+                if (parent.type === "Property" && astUtils.getStaticPropertyName(parent) === "get" && parent.parent.type === "ObjectExpression") {
+
+                    // Object.defineProperty()
+                    if (parent.parent.parent.type === "CallExpression" &&
+                        astUtils.getStaticPropertyName(parent.parent.parent.callee) === "defineProperty") {
+                        return true;
+                    }
+
+                    // Object.defineProperties()
+                    if (parent.parent.parent.type === "Property" &&
+                        parent.parent.parent.parent.type === "ObjectExpression" &&
+                        parent.parent.parent.parent.parent.type === "CallExpression" &&
+                        astUtils.getStaticPropertyName(parent.parent.parent.parent.parent.callee) === "defineProperties") {
+                        return true;
+                    }
+                }
+            }
+            return false;
+        }
+        return {
+
+            // Stacks this function's information.
+            onCodePathStart(codePath, node) {
+                funcInfo = {
+                    upper: funcInfo,
+                    codePath,
+                    hasReturn: false,
+                    shouldCheck: isGetter(node),
+                    node
+                };
+            },
+
+            // Pops this function's information.
+            onCodePathEnd() {
+                funcInfo = funcInfo.upper;
+            },
+
+            // Checks the return statement is valid.
+            ReturnStatement(node) {
+                if (funcInfo.shouldCheck) {
+                    funcInfo.hasReturn = true;
+
+                    // if allowImplicit: false, should also check node.argument
+                    if (!options.allowImplicit && !node.argument) {
+                        context.report({
+                            node,
+                            messageId: "expected",
+                            data: {
+                                name: astUtils.getFunctionNameWithKind(funcInfo.node)
+                            }
+                        });
+                    }
+                }
+            },
+
+            // Reports a given function if the last path is reachable.
+            "FunctionExpression:exit": checkLastSegment,
+            "ArrowFunctionExpression:exit": checkLastSegment
+        };
+    }
+};

node_modules/eslint/lib/rules/global-require.js

@@ -0,0 +1,86 @@
+/**
+ * @fileoverview Rule for disallowing require() outside of the top-level module context
+ * @author Jamund Ferguson
+ */
+
+"use strict";
+
+const ACCEPTABLE_PARENTS = [
+    "AssignmentExpression",
+    "VariableDeclarator",
+    "MemberExpression",
+    "ExpressionStatement",
+    "CallExpression",
+    "ConditionalExpression",
+    "Program",
+    "VariableDeclaration",
+    "ChainExpression"
+];
+
+/**
+ * Finds the eslint-scope reference in the given scope.
+ * @param {Object} scope The scope to search.
+ * @param {ASTNode} node The identifier node.
+ * @returns {Reference|null} Returns the found reference or null if none were found.
+ */
+function findReference(scope, node) {
+    const references = scope.references.filter(reference => reference.identifier.range[0] === node.range[0] &&
+            reference.identifier.range[1] === node.range[1]);
+
+    /* istanbul ignore else: correctly returns null */
+    if (references.length === 1) {
+        return references[0];
+    }
+    return null;
+
+}
+
+/**
+ * Checks if the given identifier node is shadowed in the given scope.
+ * @param {Object} scope The current scope.
+ * @param {ASTNode} node The identifier node to check.
+ * @returns {boolean} Whether or not the name is shadowed.
+ */
+function isShadowed(scope, node) {
+    const reference = findReference(scope, node);
+
+    return reference && reference.resolved && reference.resolved.defs.length > 0;
+}
+
+module.exports = {
+    meta: {
+        deprecated: true,
+
+        replacedBy: [],
+
+        type: "suggestion",
+
+        docs: {
+            description: "require `require()` calls to be placed at top-level module scope",
+            category: "Node.js and CommonJS",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/global-require"
+        },
+
+        schema: [],
+        messages: {
+            unexpected: "Unexpected require()."
+        }
+    },
+
+    create(context) {
+        return {
+            CallExpression(node) {
+                const currentScope = context.getScope();
+
+                if (node.callee.name === "require" && !isShadowed(currentScope, node.callee)) {
+                    const isGoodRequire = context.getAncestors().every(parent => ACCEPTABLE_PARENTS.indexOf(parent.type) > -1);
+
+                    if (!isGoodRequire) {
+                        context.report({ node, messageId: "unexpected" });
+                    }
+                }
+            }
+        };
+    }
+};

node_modules/eslint/lib/rules/grouped-accessor-pairs.js

@@ -0,0 +1,224 @@
+/**
+ * @fileoverview Rule to require grouped accessor pairs in object literals and classes
+ * @author Milos Djermanovic
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Typedefs
+//------------------------------------------------------------------------------
+
+/**
+ * Property name if it can be computed statically, otherwise the list of the tokens of the key node.
+ * @typedef {string|Token[]} Key
+ */
+
+/**
+ * Accessor nodes with the same key.
+ * @typedef {Object} AccessorData
+ * @property {Key} key Accessor's key
+ * @property {ASTNode[]} getters List of getter nodes.
+ * @property {ASTNode[]} setters List of setter nodes.
+ */
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Checks whether or not the given lists represent the equal tokens in the same order.
+ * Tokens are compared by their properties, not by instance.
+ * @param {Token[]} left First list of tokens.
+ * @param {Token[]} right Second list of tokens.
+ * @returns {boolean} `true` if the lists have same tokens.
+ */
+function areEqualTokenLists(left, right) {
+    if (left.length !== right.length) {
+        return false;
+    }
+
+    for (let i = 0; i < left.length; i++) {
+        const leftToken = left[i],
+            rightToken = right[i];
+
+        if (leftToken.type !== rightToken.type || leftToken.value !== rightToken.value) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+/**
+ * Checks whether or not the given keys are equal.
+ * @param {Key} left First key.
+ * @param {Key} right Second key.
+ * @returns {boolean} `true` if the keys are equal.
+ */
+function areEqualKeys(left, right) {
+    if (typeof left === "string" && typeof right === "string") {
+
+        // Statically computed names.
+        return left === right;
+    }
+    if (Array.isArray(left) && Array.isArray(right)) {
+
+        // Token lists.
+        return areEqualTokenLists(left, right);
+    }
+
+    return false;
+}
+
+/**
+ * Checks whether or not a given node is of an accessor kind ('get' or 'set').
+ * @param {ASTNode} node A node to check.
+ * @returns {boolean} `true` if the node is of an accessor kind.
+ */
+function isAccessorKind(node) {
+    return node.kind === "get" || node.kind === "set";
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "require grouped accessor pairs in object literals and classes",
+            category: "Best Practices",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/grouped-accessor-pairs"
+        },
+
+        schema: [
+            {
+                enum: ["anyOrder", "getBeforeSet", "setBeforeGet"]
+            }
+        ],
+
+        messages: {
+            notGrouped: "Accessor pair {{ formerName }} and {{ latterName }} should be grouped.",
+            invalidOrder: "Expected {{ latterName }} to be before {{ formerName }}."
+        }
+    },
+
+    create(context) {
+        const order = context.options[0] || "anyOrder";
+        const sourceCode = context.getSourceCode();
+
+        /**
+         * Reports the given accessor pair.
+         * @param {string} messageId messageId to report.
+         * @param {ASTNode} formerNode getter/setter node that is defined before `latterNode`.
+         * @param {ASTNode} latterNode getter/setter node that is defined after `formerNode`.
+         * @returns {void}
+         * @private
+         */
+        function report(messageId, formerNode, latterNode) {
+            context.report({
+                node: latterNode,
+                messageId,
+                loc: astUtils.getFunctionHeadLoc(latterNode.value, sourceCode),
+                data: {
+                    formerName: astUtils.getFunctionNameWithKind(formerNode.value),
+                    latterName: astUtils.getFunctionNameWithKind(latterNode.value)
+                }
+            });
+        }
+
+        /**
+         * Creates a new `AccessorData` object for the given getter or setter node.
+         * @param {ASTNode} node A getter or setter node.
+         * @returns {AccessorData} New `AccessorData` object that contains the given node.
+         * @private
+         */
+        function createAccessorData(node) {
+            const name = astUtils.getStaticPropertyName(node);
+            const key = (name !== null) ? name : sourceCode.getTokens(node.key);
+
+            return {
+                key,
+                getters: node.kind === "get" ? [node] : [],
+                setters: node.kind === "set" ? [node] : []
+            };
+        }
+
+        /**
+         * Merges the given `AccessorData` object into the given accessors list.
+         * @param {AccessorData[]} accessors The list to merge into.
+         * @param {AccessorData} accessorData The object to merge.
+         * @returns {AccessorData[]} The same instance with the merged object.
+         * @private
+         */
+        function mergeAccessorData(accessors, accessorData) {
+            const equalKeyElement = accessors.find(a => areEqualKeys(a.key, accessorData.key));
+
+            if (equalKeyElement) {
+                equalKeyElement.getters.push(...accessorData.getters);
+                equalKeyElement.setters.push(...accessorData.setters);
+            } else {
+                accessors.push(accessorData);
+            }
+
+            return accessors;
+        }
+
+        /**
+         * Checks accessor pairs in the given list of nodes.
+         * @param {ASTNode[]} nodes The list to check.
+         * @param {Function} shouldCheck – Predicate that returns `true` if the node should be checked.
+         * @returns {void}
+         * @private
+         */
+        function checkList(nodes, shouldCheck) {
+            const accessors = nodes
+                .filter(shouldCheck)
+                .filter(isAccessorKind)
+                .map(createAccessorData)
+                .reduce(mergeAccessorData, []);
+
+            for (const { getters, setters } of accessors) {
+
+                // Don't report accessor properties that have duplicate getters or setters.
+                if (getters.length === 1 && setters.length === 1) {
+                    const [getter] = getters,
+                        [setter] = setters,
+                        getterIndex = nodes.indexOf(getter),
+                        setterIndex = nodes.indexOf(setter),
+                        formerNode = getterIndex < setterIndex ? getter : setter,
+                        latterNode = getterIndex < setterIndex ? setter : getter;
+
+                    if (Math.abs(getterIndex - setterIndex) > 1) {
+                        report("notGrouped", formerNode, latterNode);
+                    } else if (
+                        (order === "getBeforeSet" && getterIndex > setterIndex) ||
+                        (order === "setBeforeGet" && getterIndex < setterIndex)
+                    ) {
+                        report("invalidOrder", formerNode, latterNode);
+                    }
+                }
+            }
+        }
+
+        return {
+            ObjectExpression(node) {
+                checkList(node.properties, n => n.type === "Property");
+            },
+            ClassBody(node) {
+                checkList(node.body, n => n.type === "MethodDefinition" && !n.static);
+                checkList(node.body, n => n.type === "MethodDefinition" && n.static);
+            }
+        };
+    }
+};

node_modules/eslint/lib/rules/guard-for-in.js

@@ -0,0 +1,76 @@
+/**
+ * @fileoverview Rule to flag for-in loops without if statements inside
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "require `for-in` loops to include an `if` statement",
+            category: "Best Practices",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/guard-for-in"
+        },
+
+        schema: [],
+        messages: {
+            wrap: "The body of a for-in should be wrapped in an if statement to filter unwanted properties from the prototype."
+        }
+    },
+
+    create(context) {
+
+        return {
+
+            ForInStatement(node) {
+                const body = node.body;
+
+                // empty statement
+                if (body.type === "EmptyStatement") {
+                    return;
+                }
+
+                // if statement
+                if (body.type === "IfStatement") {
+                    return;
+                }
+
+                // empty block
+                if (body.type === "BlockStatement" && body.body.length === 0) {
+                    return;
+                }
+
+                // block with just if statement
+                if (body.type === "BlockStatement" && body.body.length === 1 && body.body[0].type === "IfStatement") {
+                    return;
+                }
+
+                // block that starts with if statement
+                if (body.type === "BlockStatement" && body.body.length >= 1 && body.body[0].type === "IfStatement") {
+                    const i = body.body[0];
+
+                    // ... whose consequent is a continue
+                    if (i.consequent.type === "ContinueStatement") {
+                        return;
+                    }
+
+                    // ... whose consequent is a block that contains only a continue
+                    if (i.consequent.type === "BlockStatement" && i.consequent.body.length === 1 && i.consequent.body[0].type === "ContinueStatement") {
+                        return;
+                    }
+                }
+
+                context.report({ node, messageId: "wrap" });
+            }
+        };
+
+    }
+};

node_modules/eslint/lib/rules/handle-callback-err.js

@@ -0,0 +1,99 @@
+/**
+ * @fileoverview Ensure handling of errors when we know they exist.
+ * @author Jamund Ferguson
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        deprecated: true,
+
+        replacedBy: [],
+
+        type: "suggestion",
+
+        docs: {
+            description: "require error handling in callbacks",
+            category: "Node.js and CommonJS",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/handle-callback-err"
+        },
+
+        schema: [
+            {
+                type: "string"
+            }
+        ],
+        messages: {
+            expected: "Expected error to be handled."
+        }
+    },
+
+    create(context) {
+
+        const errorArgument = context.options[0] || "err";
+
+        /**
+         * Checks if the given argument should be interpreted as a regexp pattern.
+         * @param {string} stringToCheck The string which should be checked.
+         * @returns {boolean} Whether or not the string should be interpreted as a pattern.
+         */
+        function isPattern(stringToCheck) {
+            const firstChar = stringToCheck[0];
+
+            return firstChar === "^";
+        }
+
+        /**
+         * Checks if the given name matches the configured error argument.
+         * @param {string} name The name which should be compared.
+         * @returns {boolean} Whether or not the given name matches the configured error variable name.
+         */
+        function matchesConfiguredErrorName(name) {
+            if (isPattern(errorArgument)) {
+                const regexp = new RegExp(errorArgument, "u");
+
+                return regexp.test(name);
+            }
+            return name === errorArgument;
+        }
+
+        /**
+         * Get the parameters of a given function scope.
+         * @param {Object} scope The function scope.
+         * @returns {Array} All parameters of the given scope.
+         */
+        function getParameters(scope) {
+            return scope.variables.filter(variable => variable.defs[0] && variable.defs[0].type === "Parameter");
+        }
+
+        /**
+         * Check to see if we're handling the error object properly.
+         * @param {ASTNode} node The AST node to check.
+         * @returns {void}
+         */
+        function checkForError(node) {
+            const scope = context.getScope(),
+                parameters = getParameters(scope),
+                firstParameter = parameters[0];
+
+            if (firstParameter && matchesConfiguredErrorName(firstParameter.name)) {
+                if (firstParameter.references.length === 0) {
+                    context.report({ node, messageId: "expected" });
+                }
+            }
+        }
+
+        return {
+            FunctionDeclaration: checkForError,
+            FunctionExpression: checkForError,
+            ArrowFunctionExpression: checkForError
+        };
+
+    }
+};