webpack/lib/library/AmdLibraryPlugin.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support 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 ExternalModule = require("../ExternalModule");
const Template = require("../Template");
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("../javascript/JavascriptModulesPlugin").RenderContext} RenderContext */
/** @typedef {import("../util/Hash")} Hash */
/** @template T @typedef {import("./AbstractLibraryPlugin").LibraryContext<T>} LibraryContext<T> */

/**
 * @typedef {Object} AmdLibraryPluginOptions
 * @property {LibraryType} type
 * @property {boolean=} requireAsWrapper
 */

/**
 * @typedef {Object} AmdLibraryPluginParsed
 * @property {string} name
 */

/**
 * @typedef {AmdLibraryPluginParsed} T
 * @extends {AbstractLibraryPlugin<AmdLibraryPluginParsed>}
 */
class AmdLibraryPlugin extends AbstractLibraryPlugin {
	/**
	 * @param {AmdLibraryPluginOptions} options the plugin options
	 */
	constructor(options) {
		super({
			pluginName: "AmdLibraryPlugin",
			type: options.type
		});
		this.requireAsWrapper = options.requireAsWrapper;
	}

	/**
	 * @param {LibraryOptions} library normalized library option
	 * @returns {T | false} preprocess as needed by overriding
	 */
	parseOptions(library) {
		const { name } = library;
		if (this.requireAsWrapper) {
			if (name) {
				throw new Error(
					`AMD library name must be unset. ${AbstractLibraryPlugin.COMMON_LIBRARY_NAME_MESSAGE}`
				);
			}
		} else {
			if (name && typeof name !== "string") {
				throw new Error(
					`AMD library name must be a simple string or unset. ${AbstractLibraryPlugin.COMMON_LIBRARY_NAME_MESSAGE}`
				);
			}
		}
		return {
			name: /** @type {string=} */ (name)
		};
	}

	/**
	 * @param {Source} source source
	 * @param {RenderContext} renderContext render context
	 * @param {LibraryContext<T>} libraryContext context
	 * @returns {Source} source with library export
	 */
	render(
		source,
		{ chunkGraph, chunk, runtimeTemplate },
		{ options, compilation }
	) {
		const modern = runtimeTemplate.supportsArrowFunction();
		const modules = chunkGraph
			.getChunkModules(chunk)
			.filter(m => m instanceof ExternalModule);
		const externals = /** @type {ExternalModule[]} */ (modules);
		const externalsDepsArray = JSON.stringify(
			externals.map(m =>
				typeof m.request === "object" && !Array.isArray(m.request)
					? m.request.amd
					: m.request
			)
		);
		const externalsArguments = externals
			.map(
				m =>
					`__WEBPACK_EXTERNAL_MODULE_${Template.toIdentifier(
						`${chunkGraph.getModuleId(m)}`
					)}__`
			)
			.join(", ");

		const iife = runtimeTemplate.isIIFE();
		const fnStart =
			(modern
				? `(${externalsArguments}) => {`
				: `function(${externalsArguments}) {`) +
			(iife || !chunk.hasRuntime() ? " return " : "\n");
		const fnEnd = iife ? ";\n}" : "\n}";

		if (this.requireAsWrapper) {
			return new ConcatSource(
				`require(${externalsDepsArray}, ${fnStart}`,
				source,
				`${fnEnd});`
			);
		} else if (options.name) {
			const name = compilation.getPath(options.name, {
				chunk
			});

			return new ConcatSource(
				`define(${JSON.stringify(name)}, ${externalsDepsArray}, ${fnStart}`,
				source,
				`${fnEnd});`
			);
		} else if (externalsArguments) {
			return new ConcatSource(
				`define(${externalsDepsArray}, ${fnStart}`,
				source,
				`${fnEnd});`
			);
		} else {
			return new ConcatSource(`define(${fnStart}`, source, `${fnEnd});`);
		}
	}

	/**
	 * @param {Chunk} chunk the chunk
	 * @param {Hash} hash hash
	 * @param {ChunkHashContext} chunkHashContext chunk hash context
	 * @param {LibraryContext<T>} libraryContext context
	 * @returns {void}
	 */
	chunkHash(chunk, hash, chunkHashContext, { options, compilation }) {
		hash.update("AmdLibraryPlugin");
		if (this.requireAsWrapper) {
			hash.update("requireAsWrapper");
		} else if (options.name) {
			hash.update("named");
			const name = compilation.getPath(options.name, {
				chunk
			});
			hash.update(name);
		}
	}
}

module.exports = AmdLibraryPlugin;