webpack/lib/ids/NamedModuleIdsPlugin.js

Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/

"use strict";

const { compareModulesByIdentifier } = require("../util/comparators");
const {
	assignAscendingModuleIds,
	assignNames,
	getLongModuleName,
	getShortModuleName,
	getUsedModuleIdsAndModules
} = require("./IdHelpers");

/** @typedef {import("../Compiler")} Compiler */

/**
 * Defines the named module ids plugin options type used by this module.
 * @typedef {object} NamedModuleIdsPluginOptions
 * @property {string=} context context
 */

const PLUGIN_NAME = "NamedModuleIdsPlugin";

class NamedModuleIdsPlugin {
	/**
	 * Creates an instance of NamedModuleIdsPlugin.
	 * @param {NamedModuleIdsPluginOptions=} options options
	 */
	constructor(options = {}) {
		/** @type {NamedModuleIdsPluginOptions} */
		this.options = options;
	}

	/**
	 * Applies the plugin by registering its hooks on the compiler.
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		const { root } = compiler;
		compiler.hooks.compilation.tap(PLUGIN_NAME, (compilation) => {
			const hashFunction = compilation.outputOptions.hashFunction;
			compilation.hooks.moduleIds.tap(PLUGIN_NAME, () => {
				const chunkGraph = compilation.chunkGraph;
				const context = this.options.context
					? this.options.context
					: compiler.context;

				const [usedIds, modules] = getUsedModuleIdsAndModules(compilation);
				const unnamedModules = assignNames(
					modules,
					(m) => getShortModuleName(m, context, root),
					(m, shortName) =>
						getLongModuleName(shortName, m, context, hashFunction, root),
					compareModulesByIdentifier,
					usedIds,
					(m, name) => chunkGraph.setModuleId(m, name)
				);
				if (unnamedModules.length > 0) {
					assignAscendingModuleIds(usedIds, unnamedModules, compilation);
				}
			});
		});
	}
}

module.exports = NamedModuleIdsPlugin;