webpack/lib/prefetch/ChunkPrefetchFunctionRuntimeModule.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
*/

"use strict";

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

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

class ChunkPrefetchFunctionRuntimeModule extends RuntimeModule {
	/**
	 * @param {string} childType TODO
	 * @param {string} runtimeFunction TODO
	 * @param {string} runtimeHandlers TODO
	 */
	constructor(childType, runtimeFunction, runtimeHandlers) {
		super(`chunk ${childType} function`);
		this.childType = childType;
		this.runtimeFunction = runtimeFunction;
		this.runtimeHandlers = runtimeHandlers;
	}

	/**
	 * @returns {string} runtime code
	 */
	generate() {
		const { runtimeFunction, runtimeHandlers } = this;
		const { runtimeTemplate } = this.compilation;
		return Template.asString([
			`${runtimeHandlers} = {};`,
			`${runtimeFunction} = ${runtimeTemplate.basicFunction("chunkId", [
				// map is shorter than forEach
				`Object.keys(${runtimeHandlers}).map(${runtimeTemplate.basicFunction(
					"key",
					`${runtimeHandlers}[key](chunkId);`
				)});`
			])}`
		]);
	}
}

module.exports = ChunkPrefetchFunctionRuntimeModule;