Updated the files.

my-app/node_modules/webpack/lib/container/FallbackDependency.js

@@ -0,0 +1,64 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const Dependency = require("../Dependency");
+const makeSerializable = require("../util/makeSerializable");
+
+/** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
+/** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
+
+class FallbackDependency extends Dependency {
+	/**
+	 * @param {string[]} requests requests
+	 */
+	constructor(requests) {
+		super();
+		this.requests = requests;
+	}
+
+	/**
+	 * @returns {string | null} an identifier to merge equal requests
+	 */
+	getResourceIdentifier() {
+		return `fallback ${this.requests.join(" ")}`;
+	}
+
+	get type() {
+		return "fallback";
+	}
+
+	get category() {
+		return "esm";
+	}
+
+	/**
+	 * @param {ObjectSerializerContext} context context
+	 */
+	serialize(context) {
+		const { write } = context;
+		write(this.requests);
+		super.serialize(context);
+	}
+
+	/**
+	 * @param {ObjectDeserializerContext} context context
+	 * @returns {FallbackDependency} deserialize fallback dependency
+	 */
+	static deserialize(context) {
+		const { read } = context;
+		const obj = new FallbackDependency(read());
+		obj.deserialize(context);
+		return obj;
+	}
+}
+
+makeSerializable(
+	FallbackDependency,
+	"webpack/lib/container/FallbackDependency"
+);
+
+module.exports = FallbackDependency;