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

/*
        MIT License http://www.opensource.org/licenses/mit-license.php
        Author Tobias Koppers @sokra
*/

"use strict";

const { getEntryRuntime } = require("./util/runtime");

/** @typedef {import("./Compiler")} Compiler */

const PLUGIN_NAME = "FlagEntryExportAsUsedPlugin";

class FlagEntryExportAsUsedPlugin {
        /**
         * Creates an instance of FlagEntryExportAsUsedPlugin.
         * @param {boolean} nsObjectUsed true, if the ns object is used
         * @param {string} explanation explanation for the reason
         */
        constructor(nsObjectUsed, explanation) {
                this.nsObjectUsed = nsObjectUsed;
                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.thisCompilation.tap(PLUGIN_NAME, (compilation) => {
                        const moduleGraph = compilation.moduleGraph;
                        compilation.hooks.seal.tap(PLUGIN_NAME, () => {
                                for (const [
                                        entryName,
                                        { dependencies: deps, options }
                                ] of compilation.entries) {
                                        const runtime = getEntryRuntime(compilation, entryName, options);
                                        for (const dep of deps) {
                                                const module = moduleGraph.getModule(dep);
                                                if (module) {
                                                        const exportsInfo = moduleGraph.getExportsInfo(module);
                                                        if (this.nsObjectUsed) {
                                                                exportsInfo.setUsedInUnknownWay(runtime);
                                                        } else {
                                                                exportsInfo.setAllKnownExportsUsed(runtime);
                                                        }
                                                        moduleGraph.addExtraReason(module, this.explanation);
                                                }
                                        }
                                }
                        });
                });
        }
}

module.exports = FlagEntryExportAsUsedPlugin;