webpack/lib/FlagEntryExportAsUsedPlugin.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 } = require("./util/runtime");

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

const PLUGIN_NAME = "FlagEntryExportAsUsedPlugin";

class 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;
	}

	/**
	 * Apply the plugin
	 * @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;