Updated the files.

my-app/node_modules/webpack/lib/async-modules/InferAsyncModulesPlugin.js

@@ -0,0 +1,55 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const HarmonyImportDependency = require("../dependencies/HarmonyImportDependency");
+
+/** @typedef {import("../Compiler")} Compiler */
+/** @typedef {import("../Module")} Module */
+
+class InferAsyncModulesPlugin {
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.compilation.tap("InferAsyncModulesPlugin", compilation => {
+			const { moduleGraph } = compilation;
+			compilation.hooks.finishModules.tap(
+				"InferAsyncModulesPlugin",
+				modules => {
+					/** @type {Set<Module>} */
+					const queue = new Set();
+					for (const module of modules) {
+						if (module.buildMeta && module.buildMeta.async) {
+							queue.add(module);
+						}
+					}
+					for (const module of queue) {
+						moduleGraph.setAsync(module);
+						for (const [
+							originModule,
+							connections
+						] of moduleGraph.getIncomingConnectionsByOriginModule(module)) {
+							if (
+								connections.some(
+									c =>
+										c.dependency instanceof HarmonyImportDependency &&
+										c.isTargetActive(undefined)
+								)
+							) {
+								queue.add(/** @type {Module} */ (originModule));
+							}
+						}
+					}
+				}
+			);
+		});
+	}
+}
+
+module.exports = InferAsyncModulesPlugin;