source: frontend/node_modules/webpack/lib/FlagAllModulesAsUsedPlugin.js

/*
        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 {
        /**
         * Creates an instance of FlagAllModulesAsUsedPlugin.
         * @param {string} explanation explanation
         */
        constructor(explanation) {
                this.explanation = explanation;
        }

        /**
         * Applies the plugin by registering its hooks on the compiler.
         * @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;
                                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;