webpack/lib/FlagAllModulesAsUsedPlugin.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 { getEntryRuntime, mergeRuntimeOwned } = require("./util/runtime");

/** @typedef {import("./Compiler")} Compiler */
/** @typedef {import("./Module").FactoryMeta} FactoryMeta */
/** @typedef {import("./util/runtime").RuntimeSpec} RuntimeSpec */

const PLUGIN_NAME = "FlagAllModulesAsUsedPlugin";
class FlagAllModulesAsUsedPlugin {
	/**
	 * @param {string} explanation explanation
	 */
	constructor(explanation) {
		this.explanation = explanation;
	}

	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.compilation.tap(PLUGIN_NAME, compilation => {
			const moduleGraph = compilation.moduleGraph;
			compilation.hooks.optimizeDependencies.tap(PLUGIN_NAME, modules => {
				/** @type {RuntimeSpec} */
				let runtime = undefined;
				for (const [name, { options }] of compilation.entries) {
					runtime = mergeRuntimeOwned(
						runtime,
						getEntryRuntime(compilation, name, options)
					);
				}
				for (const module of modules) {
					const exportsInfo = moduleGraph.getExportsInfo(module);
					exportsInfo.setUsedInUnknownWay(runtime);
					moduleGraph.addExtraReason(module, this.explanation);
					if (module.factoryMeta === undefined) {
						module.factoryMeta = {};
					}
					/** @type {FactoryMeta} */
					(module.factoryMeta).sideEffectFree = false;
				}
			});
		});
	}
}

module.exports = FlagAllModulesAsUsedPlugin;