FlagAllModulesAsUsedPlugin.js
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FlagAllModulesAsUsedPlugin.js
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			/*
			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;