webpack/lib/MultiModule.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 Module = require("./Module");
const Template = require("./Template");
const { RawSource } = require("webpack-sources");

/** @typedef {import("./util/createHash").Hash} Hash */

class MultiModule extends Module {
	constructor(context, dependencies, name) {
		super("javascript/dynamic", context);

		// Info from Factory
		this.dependencies = dependencies;
		this.name = name;
		this._identifier = `multi ${this.dependencies
			.map(d => d.request)
			.join(" ")}`;
	}

	identifier() {
		return this._identifier;
	}

	readableIdentifier(requestShortener) {
		return `multi ${this.dependencies
			.map(d => requestShortener.shorten(d.request))
			.join(" ")}`;
	}

	build(options, compilation, resolver, fs, callback) {
		this.built = true;
		this.buildMeta = {};
		this.buildInfo = {};
		return callback();
	}

	needRebuild() {
		return false;
	}

	size() {
		return 16 + this.dependencies.length * 12;
	}

	/**
	 * @param {Hash} hash the hash used to track dependencies
	 * @returns {void}
	 */
	updateHash(hash) {
		hash.update("multi module");
		hash.update(this.name || "");
		super.updateHash(hash);
	}

	source(dependencyTemplates, runtimeTemplate) {
		const str = [];
		let idx = 0;
		for (const dep of this.dependencies) {
			if (dep.module) {
				if (idx === this.dependencies.length - 1) {
					str.push("module.exports = ");
				}
				str.push("__webpack_require__(");
				if (runtimeTemplate.outputOptions.pathinfo) {
					str.push(Template.toComment(dep.request));
				}
				str.push(`${JSON.stringify(dep.module.id)}`);
				str.push(")");
			} else {
				const content = require("./dependencies/WebpackMissingModule").module(
					dep.request
				);
				str.push(content);
			}
			str.push(";\n");
			idx++;
		}
		return new RawSource(str.join(""));
	}
}

module.exports = MultiModule;