webpack/lib/ExternalsPlugin.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 ExternalModuleFactoryPlugin = require("./ExternalModuleFactoryPlugin");

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

class ExternalsPlugin {
	/**
	 * @param {string | undefined} type default external type
	 * @param {Externals} externals externals config
	 */
	constructor(type, externals) {
		this.type = type;
		this.externals = externals;
	}

	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.compile.tap("ExternalsPlugin", ({ normalModuleFactory }) => {
			new ExternalModuleFactoryPlugin(this.type, this.externals).apply(
				normalModuleFactory
			);
		});
	}
}

module.exports = ExternalsPlugin;