webpack/lib/AmdMainTemplatePlugin.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 Template = require("./Template");

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

/**
 * @typedef {Object} AmdMainTemplatePluginOptions
 * @param {string=} name the library name
 * @property {boolean=} requireAsWrapper
 */

class AmdMainTemplatePlugin {
	/**
	 * @param {AmdMainTemplatePluginOptions} options the plugin options
	 */
	constructor(options) {
		if (!options || typeof options === "string") {
			this.name = options;
			this.requireAsWrapper = false;
		} else {
			this.name = options.name;
			this.requireAsWrapper = options.requireAsWrapper;
		}
	}

	/**
	 * @param {Compilation} compilation the compilation instance
	 * @returns {void}
	 */
	apply(compilation) {
		const { mainTemplate, chunkTemplate } = compilation;

		const onRenderWithEntry = (source, chunk, hash) => {
			const externals = chunk.getModules().filter(m => m.external);
			const externalsDepsArray = JSON.stringify(
				externals.map(m =>
					typeof m.request === "object" ? m.request.amd : m.request
				)
			);
			const externalsArguments = externals
				.map(
					m => `__WEBPACK_EXTERNAL_MODULE_${Template.toIdentifier(`${m.id}`)}__`
				)
				.join(", ");

			if (this.requireAsWrapper) {
				return new ConcatSource(
					`require(${externalsDepsArray}, function(${externalsArguments}) { return `,
					source,
					"});"
				);
			} else if (this.name) {
				const name = mainTemplate.getAssetPath(this.name, {
					hash,
					chunk
				});

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

		for (const template of [mainTemplate, chunkTemplate]) {
			template.hooks.renderWithEntry.tap(
				"AmdMainTemplatePlugin",
				onRenderWithEntry
			);
		}

		mainTemplate.hooks.globalHashPaths.tap("AmdMainTemplatePlugin", paths => {
			if (this.name) {
				paths.push(this.name);
			}
			return paths;
		});

		mainTemplate.hooks.hash.tap("AmdMainTemplatePlugin", hash => {
			hash.update("exports amd");
			if (this.name) {
				hash.update(this.name);
			}
		});
	}
}

module.exports = AmdMainTemplatePlugin;