1 files changed, 51 insertions, 0 deletions
diff --git a/node_modules/webpack/lib/prefetch/ChunkPrefetchTriggerRuntimeModule.js b/node_modules/webpack/lib/prefetch/ChunkPrefetchTriggerRuntimeModule.js
new file mode 100644
index 00000000..74eb2bc6
--- /dev/null
+++ b/node_modules/webpack/lib/prefetch/ChunkPrefetchTriggerRuntimeModule.js
@@ -0,0 +1,51 @@
+/*
+	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 ChunkPrefetchTriggerRuntimeModule extends RuntimeModule {
+	/**
+	 * @param {Record<string|number, (string|number)[]>} chunkMap map from chunk to
+	 */
+	constructor(chunkMap) {
+		super("chunk prefetch 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.prefetchChunk});`
+		];
+		return Template.asString([
+			Template.asString([
+				`var chunkToChildrenMap = ${JSON.stringify(chunkMap, null, "\t")};`,
+				`${
+					RuntimeGlobals.ensureChunkHandlers
+				}.prefetch = ${runtimeTemplate.expressionFunction(
+					`Promise.all(promises).then(${runtimeTemplate.basicFunction(
+						"",
+						body
+					)})`,
+					"chunkId, promises"
+				)};`
+			])
+		]);
+	}
+}
+
+module.exports = ChunkPrefetchTriggerRuntimeModule;