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node_modules/webpack/lib/dependencies/LoaderPlugin.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const NormalModule = require("../NormalModule");
+const LazySet = require("../util/LazySet");
+const LoaderDependency = require("./LoaderDependency");
+const LoaderImportDependency = require("./LoaderImportDependency");
+
+/** @typedef {import("../Compilation").DepConstructor} DepConstructor */
+/** @typedef {import("../Compiler")} Compiler */
+/** @typedef {import("../Module")} Module */
+
+/**
+ * @callback LoadModuleCallback
+ * @param {(Error | null)=} err error object
+ * @param {string | Buffer=} source source code
+ * @param {object=} map source map
+ * @param {Module=} module loaded module if successful
+ */
+
+/**
+ * @callback ImportModuleCallback
+ * @param {(Error | null)=} err error object
+ * @param {any=} exports exports of the evaluated module
+ */
+
+/**
+ * @typedef {Object} ImportModuleOptions
+ * @property {string=} layer the target layer
+ * @property {string=} publicPath the target public path
+ * @property {string=} baseUri target base uri
+ */
+
+class LoaderPlugin {
+	/**
+	 * @param {Object} options options
+	 */
+	constructor(options = {}) {}
+
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.compilation.tap(
+			"LoaderPlugin",
+			(compilation, { normalModuleFactory }) => {
+				compilation.dependencyFactories.set(
+					LoaderDependency,
+					normalModuleFactory
+				);
+				compilation.dependencyFactories.set(
+					LoaderImportDependency,
+					normalModuleFactory
+				);
+			}
+		);
+
+		compiler.hooks.compilation.tap("LoaderPlugin", compilation => {
+			const moduleGraph = compilation.moduleGraph;
+			NormalModule.getCompilationHooks(compilation).loader.tap(
+				"LoaderPlugin",
+				loaderContext => {
+					/**
+					 * @param {string} request the request string to load the module from
+					 * @param {LoadModuleCallback} callback callback returning the loaded module or error
+					 * @returns {void}
+					 */
+					loaderContext.loadModule = (request, callback) => {
+						const dep = new LoaderDependency(request);
+						dep.loc = {
+							name: request
+						};
+						const factory = compilation.dependencyFactories.get(
+							/** @type {DepConstructor} */ (dep.constructor)
+						);
+						if (factory === undefined) {
+							return callback(
+								new Error(
+									`No module factory available for dependency type: ${dep.constructor.name}`
+								)
+							);
+						}
+						compilation.buildQueue.increaseParallelism();
+						compilation.handleModuleCreation(
+							{
+								factory,
+								dependencies: [dep],
+								originModule: loaderContext._module,
+								context: loaderContext.context,
+								recursive: false
+							},
+							err => {
+								compilation.buildQueue.decreaseParallelism();
+								if (err) {
+									return callback(err);
+								}
+								const referencedModule = moduleGraph.getModule(dep);
+								if (!referencedModule) {
+									return callback(new Error("Cannot load the module"));
+								}
+								if (referencedModule.getNumberOfErrors() > 0) {
+									return callback(
+										new Error("The loaded module contains errors")
+									);
+								}
+								const moduleSource = referencedModule.originalSource();
+								if (!moduleSource) {
+									return callback(
+										new Error(
+											"The module created for a LoaderDependency must have an original source"
+										)
+									);
+								}
+								let source, map;
+								if (moduleSource.sourceAndMap) {
+									const sourceAndMap = moduleSource.sourceAndMap();
+									map = sourceAndMap.map;
+									source = sourceAndMap.source;
+								} else {
+									map = moduleSource.map();
+									source = moduleSource.source();
+								}
+								const fileDependencies = new LazySet();
+								const contextDependencies = new LazySet();
+								const missingDependencies = new LazySet();
+								const buildDependencies = new LazySet();
+								referencedModule.addCacheDependencies(
+									fileDependencies,
+									contextDependencies,
+									missingDependencies,
+									buildDependencies
+								);
+
+								for (const d of fileDependencies) {
+									loaderContext.addDependency(d);
+								}
+								for (const d of contextDependencies) {
+									loaderContext.addContextDependency(d);
+								}
+								for (const d of missingDependencies) {
+									loaderContext.addMissingDependency(d);
+								}
+								for (const d of buildDependencies) {
+									loaderContext.addBuildDependency(d);
+								}
+								return callback(null, source, map, referencedModule);
+							}
+						);
+					};
+
+					/**
+					 * @param {string} request the request string to load the module from
+					 * @param {ImportModuleOptions=} options options
+					 * @param {ImportModuleCallback=} callback callback returning the exports
+					 * @returns {void}
+					 */
+					const importModule = (request, options, callback) => {
+						const dep = new LoaderImportDependency(request);
+						dep.loc = {
+							name: request
+						};
+						const factory = compilation.dependencyFactories.get(
+							/** @type {DepConstructor} */ (dep.constructor)
+						);
+						if (factory === undefined) {
+							return callback(
+								new Error(
+									`No module factory available for dependency type: ${dep.constructor.name}`
+								)
+							);
+						}
+						compilation.buildQueue.increaseParallelism();
+						compilation.handleModuleCreation(
+							{
+								factory,
+								dependencies: [dep],
+								originModule: loaderContext._module,
+								contextInfo: {
+									issuerLayer: options.layer
+								},
+								context: loaderContext.context,
+								connectOrigin: false
+							},
+							err => {
+								compilation.buildQueue.decreaseParallelism();
+								if (err) {
+									return callback(err);
+								}
+								const referencedModule = moduleGraph.getModule(dep);
+								if (!referencedModule) {
+									return callback(new Error("Cannot load the module"));
+								}
+								compilation.executeModule(
+									referencedModule,
+									{
+										entryOptions: {
+											baseUri: options.baseUri,
+											publicPath: options.publicPath
+										}
+									},
+									(err, result) => {
+										if (err) return callback(err);
+										for (const d of result.fileDependencies) {
+											loaderContext.addDependency(d);
+										}
+										for (const d of result.contextDependencies) {
+											loaderContext.addContextDependency(d);
+										}
+										for (const d of result.missingDependencies) {
+											loaderContext.addMissingDependency(d);
+										}
+										for (const d of result.buildDependencies) {
+											loaderContext.addBuildDependency(d);
+										}
+										if (result.cacheable === false)
+											loaderContext.cacheable(false);
+										for (const [name, { source, info }] of result.assets) {
+											const { buildInfo } = loaderContext._module;
+											if (!buildInfo.assets) {
+												buildInfo.assets = Object.create(null);
+												buildInfo.assetsInfo = new Map();
+											}
+											buildInfo.assets[name] = source;
+											buildInfo.assetsInfo.set(name, info);
+										}
+										callback(null, result.exports);
+									}
+								);
+							}
+						);
+					};
+
+					/**
+					 * @param {string} request the request string to load the module from
+					 * @param {ImportModuleOptions} options options
+					 * @param {ImportModuleCallback=} callback callback returning the exports
+					 * @returns {Promise<any> | void} exports
+					 */
+					loaderContext.importModule = (request, options, callback) => {
+						if (!callback) {
+							return new Promise((resolve, reject) => {
+								importModule(request, options || {}, (err, result) => {
+									if (err) reject(err);
+									else resolve(result);
+								});
+							});
+						}
+						return importModule(request, options || {}, callback);
+					};
+				}
+			);
+		});
+	}
+}
+module.exports = LoaderPlugin;