package.lib.prefetch.ChunkPreloadTriggerRuntimeModule.js Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of webpack Show documentation

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.

The newest version!

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
*/

"use strict";

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

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

class ChunkPreloadTriggerRuntimeModule extends RuntimeModule {
	/**
	 * @param {Record} chunkMap map from chunk to chunks
	 */
	constructor(chunkMap) {
		super(`chunk preload trigger`, RuntimeModule.STAGE_TRIGGER);
		this.chunkMap = chunkMap;
	}

	/**
	 * @returns {string | null} runtime code
	 */
	generate() {
		const { chunkMap } = this;
		const compilation = /** @type {Compilation} */ (this.compilation);
		const { runtimeTemplate } = compilation;
		const body = [
			"var chunks = chunkToChildrenMap[chunkId];",
			`Array.isArray(chunks) && chunks.map(${RuntimeGlobals.preloadChunk});`
		];
		return Template.asString([
			Template.asString([
				`var chunkToChildrenMap = ${JSON.stringify(chunkMap, null, "\t")};`,
				`${
					RuntimeGlobals.ensureChunkHandlers
				}.preload = ${runtimeTemplate.basicFunction("chunkId", body)};`
			])
		]);
	}
}

module.exports = ChunkPreloadTriggerRuntimeModule;