webpack/lib/dependencies/SystemRuntimeModule.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 Florent Cailhol @ooflorent
*/

"use strict";

const RuntimeGlobals = require("../RuntimeGlobals");
const RuntimeModule = require("../RuntimeModule");
const Template = require("../Template");

class SystemRuntimeModule extends RuntimeModule {
	constructor() {
		super("system");
	}

	/**
	 * Returns true, if the runtime module should get it's own scope.
	 * When false, `generate()` must emit complete statements ending with `;`
	 * so a following runtime IIFE is not parsed as a call (ASI).
	 * @returns {boolean} true, if the runtime module should get it's own scope
	 */
	shouldIsolate() {
		return false;
	}

	/**
	 * The `[handlerMap, key]` pairs this module installs onto a chunk handler map
	 * such as `__webpack_require__.f`, or `null` where it cannot name them.
	 * @returns {[string, string][] | null} installed chunk handlers (do not mutate)
	 */
	getInstalledChunkHandlers() {
		return RuntimeModule.NO_CHUNK_HANDLERS;
	}

	/**
	 * Generates runtime code for this runtime module.
	 * @returns {string | null} runtime code
	 */
	generate() {
		return Template.asString([
			`${RuntimeGlobals.system} = {`,
			Template.indent([
				"import: function () {",
				Template.indent(
					"throw new Error('System.import cannot be used indirectly');"
				),
				"}"
			]),
			"};"
		]);
	}
}

module.exports = SystemRuntimeModule;