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node_modules/eslint/lib/rules/id-blacklist.js

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+/**
+ * @fileoverview Rule that warns when identifier names that are
+ * specified in the configuration are used.
+ * @author Keith Cirkel (http://keithcirkel.co.uk)
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Checks whether the given node represents assignment target in a normal assignment or destructuring.
+ * @param {ASTNode} node The node to check.
+ * @returns {boolean} `true` if the node is assignment target.
+ */
+function isAssignmentTarget(node) {
+    const parent = node.parent;
+
+    return (
+
+        // normal assignment
+        (
+            parent.type === "AssignmentExpression" &&
+            parent.left === node
+        ) ||
+
+        // destructuring
+        parent.type === "ArrayPattern" ||
+        parent.type === "RestElement" ||
+        (
+            parent.type === "Property" &&
+            parent.value === node &&
+            parent.parent.type === "ObjectPattern"
+        ) ||
+        (
+            parent.type === "AssignmentPattern" &&
+            parent.left === node
+        )
+    );
+}
+
+/**
+ * Checks whether the given node represents an imported name that is renamed in the same import/export specifier.
+ *
+ * Examples:
+ * import { a as b } from 'mod'; // node `a` is renamed import
+ * export { a as b } from 'mod'; // node `a` is renamed import
+ * @param {ASTNode} node `Identifier` node to check.
+ * @returns {boolean} `true` if the node is a renamed import.
+ */
+function isRenamedImport(node) {
+    const parent = node.parent;
+
+    return (
+        (
+            parent.type === "ImportSpecifier" &&
+            parent.imported !== parent.local &&
+            parent.imported === node
+        ) ||
+        (
+            parent.type === "ExportSpecifier" &&
+            parent.parent.source && // re-export
+            parent.local !== parent.exported &&
+            parent.local === node
+        )
+    );
+}
+
+/**
+ * Checks whether the given node is a renamed identifier node in an ObjectPattern destructuring.
+ *
+ * Examples:
+ * const { a : b } = foo; // node `a` is renamed node.
+ * @param {ASTNode} node `Identifier` node to check.
+ * @returns {boolean} `true` if the node is a renamed node in an ObjectPattern destructuring.
+ */
+function isRenamedInDestructuring(node) {
+    const parent = node.parent;
+
+    return (
+        (
+            !parent.computed &&
+            parent.type === "Property" &&
+            parent.parent.type === "ObjectPattern" &&
+            parent.value !== node &&
+            parent.key === node
+        )
+    );
+}
+
+/**
+ * Checks whether the given node represents shorthand definition of a property in an object literal.
+ * @param {ASTNode} node `Identifier` node to check.
+ * @returns {boolean} `true` if the node is a shorthand property definition.
+ */
+function isShorthandPropertyDefinition(node) {
+    const parent = node.parent;
+
+    return (
+        parent.type === "Property" &&
+        parent.parent.type === "ObjectExpression" &&
+        parent.shorthand
+    );
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        deprecated: true,
+        replacedBy: ["id-denylist"],
+
+        type: "suggestion",
+
+        docs: {
+            description: "disallow specified identifiers",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/id-blacklist"
+        },
+
+        schema: {
+            type: "array",
+            items: {
+                type: "string"
+            },
+            uniqueItems: true
+        },
+        messages: {
+            restricted: "Identifier '{{name}}' is restricted."
+        }
+    },
+
+    create(context) {
+
+        const denyList = new Set(context.options);
+        const reportedNodes = new Set();
+
+        let globalScope;
+
+        /**
+         * Checks whether the given name is restricted.
+         * @param {string} name The name to check.
+         * @returns {boolean} `true` if the name is restricted.
+         * @private
+         */
+        function isRestricted(name) {
+            return denyList.has(name);
+        }
+
+        /**
+         * 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);
+        }
+
+        /**
+         * Determines whether the given node should be checked.
+         * @param {ASTNode} node `Identifier` node.
+         * @returns {boolean} `true` if the node should be checked.
+         */
+        function shouldCheck(node) {
+            const parent = node.parent;
+
+            /*
+             * Member access has special rules for checking property names.
+             * Read access to a property with a restricted name is allowed, because it can be on an object that user has no control over.
+             * Write access isn't allowed, because it potentially creates a new property with a restricted name.
+             */
+            if (
+                parent.type === "MemberExpression" &&
+                parent.property === node &&
+                !parent.computed
+            ) {
+                return isAssignmentTarget(parent);
+            }
+
+            return (
+                parent.type !== "CallExpression" &&
+                parent.type !== "NewExpression" &&
+                !isRenamedImport(node) &&
+                !isRenamedInDestructuring(node) &&
+                !(
+                    isReferenceToGlobalVariable(node) &&
+                    !isShorthandPropertyDefinition(node)
+                )
+            );
+        }
+
+        /**
+         * Reports an AST node as a rule violation.
+         * @param {ASTNode} node The node to report.
+         * @returns {void}
+         * @private
+         */
+        function report(node) {
+            if (!reportedNodes.has(node)) {
+                context.report({
+                    node,
+                    messageId: "restricted",
+                    data: {
+                        name: node.name
+                    }
+                });
+                reportedNodes.add(node);
+            }
+        }
+
+        return {
+
+            Program() {
+                globalScope = context.getScope();
+            },
+
+            Identifier(node) {
+                if (isRestricted(node.name) && shouldCheck(node)) {
+                    report(node);
+                }
+            }
+        };
+    }
+};