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

/** @typedef {import("../../declarations/WebpackOptions").OutputNormalized} Output */
/** @typedef {import("../Compiler")} Compiler */
/** @typedef {import("../Module")} Module */

/**
 * @typedef {object} NamedModuleIdsPluginOptions
 * @property {string=} context context
 */

const PLUGIN_NAME = "NamedModuleIdsPlugin";

class NamedModuleIdsPlugin {
	/**
	 * @param {NamedModuleIdsPluginOptions=} options options
	 */
	constructor(options = {}) {
		this.options = options;
	}

	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		const { root } = compiler;
		compiler.hooks.compilation.tap(PLUGIN_NAME, compilation => {
			const hashFunction =
				/** @type {NonNullable<Output["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;