webpack/lib/FlagAllModulesAsUsedPlugin.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support 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("./util/runtime").RuntimeSpec} RuntimeSpec */

class FlagAllModulesAsUsedPlugin {
	constructor(explanation) {
		this.explanation = explanation;
	}

	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.compilation.tap(
			"FlagAllModulesAsUsedPlugin",
			compilation => {
				const moduleGraph = compilation.moduleGraph;
				compilation.hooks.optimizeDependencies.tap(
					"FlagAllModulesAsUsedPlugin",
					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 = {};
							}
							module.factoryMeta.sideEffectFree = false;
						}
					}
				);
			}
		);
	}
}

module.exports = FlagAllModulesAsUsedPlugin;