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node_modules/webpack/lib/prefetch/ChunkPreloadTriggerRuntimeModule.js

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+/*
+	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<string|number, (string|number)[]>} 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;