webpack/lib/library/ModernModuleLibraryPlugin.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 { ConcatSource } = require("webpack-sources");
const ConcatenatedModule = require("../optimize/ConcatenatedModule");
const AbstractLibraryPlugin = require("./AbstractLibraryPlugin");

/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("../../declarations/WebpackOptions").LibraryOptions} LibraryOptions */
/** @typedef {import("../../declarations/WebpackOptions").LibraryType} LibraryType */
/** @typedef {import("../Chunk")} Chunk */
/** @typedef {import("../Compilation").ChunkHashContext} ChunkHashContext */
/** @typedef {import("../Compiler")} Compiler */
/** @typedef {import("../Module")} Module */
/** @typedef {import("../javascript/JavascriptModulesPlugin").StartupRenderContext} StartupRenderContext */
/** @typedef {import("../util/Hash")} Hash */
/** @template T @typedef {import("./AbstractLibraryPlugin").LibraryContext<T>} LibraryContext<T> */

/**
 * @typedef {object} ModernModuleLibraryPluginOptions
 * @property {LibraryType} type
 */

/**
 * @typedef {object} ModernModuleLibraryPluginParsed
 * @property {string} name
 */

/**
 * @typedef {ModernModuleLibraryPluginParsed} T
 * @extends {AbstractLibraryPlugin<ModernModuleLibraryPluginParsed>}
 */
class ModernModuleLibraryPlugin extends AbstractLibraryPlugin {
	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		super.apply(compiler);

		compiler.hooks.compilation.tap("ModernModuleLibraryPlugin", compilation => {
			const { exportsDefinitions } =
				ConcatenatedModule.getCompilationHooks(compilation);
			exportsDefinitions.tap("ModernModuleLibraryPlugin", () => {
				return true;
			});
		});
	}

	/**
	 * @param {ModernModuleLibraryPluginOptions} options the plugin options
	 */
	constructor(options) {
		super({
			pluginName: "ModernModuleLibraryPlugin",
			type: options.type
		});
	}

	/**
	 * @param {LibraryOptions} library normalized library option
	 * @returns {T | false} preprocess as needed by overriding
	 */
	parseOptions(library) {
		const { name } = library;
		if (name) {
			throw new Error(
				`Library name must be unset. ${AbstractLibraryPlugin.COMMON_LIBRARY_NAME_MESSAGE}`
			);
		}
		return {
			name: /** @type {string} */ (name)
		};
	}

	/**
	 * @param {Source} source source
	 * @param {Module} module module
	 * @param {StartupRenderContext} renderContext render context
	 * @param {LibraryContext<T>} libraryContext context
	 * @returns {Source} source with library export
	 */
	renderStartup(
		source,
		module,
		{ moduleGraph, chunk },
		{ options, compilation }
	) {
		const result = new ConcatSource(source);
		const exportsInfo = moduleGraph.getExportsInfo(module);
		const definitions = module.buildMeta.exportsFinalName;
		const exports = [];

		for (const exportInfo of exportsInfo.orderedExports) {
			let shouldContinue = false;
			const reexport = exportInfo.findTarget(moduleGraph, _m => true);

			if (reexport) {
				const exp = moduleGraph.getExportsInfo(reexport.module);

				for (const reexportInfo of exp.orderedExports) {
					if (
						!reexportInfo.provided &&
						reexportInfo.name === reexport.export[0]
					) {
						shouldContinue = true;
					}
				}
			}

			if (shouldContinue) continue;

			const webpackExportsProperty = exportInfo.getUsedName(
				exportInfo.name,
				chunk.runtime
			);
			const finalName =
				definitions[
					/** @type {string} */
					(webpackExportsProperty)
				];
			exports.push(
				finalName === exportInfo.name
					? finalName
					: `${finalName} as ${exportInfo.name}`
			);
		}

		if (exports.length > 0) {
			result.add(`export { ${exports.join(", ")} };\n`);
		}

		return result;
	}
}

module.exports = ModernModuleLibraryPlugin;