Updated the files.

my-app/node_modules/@angular-devkit/build-webpack/src/builders/webpack-dev-server/index.d.ts

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+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+import { BuilderContext } from '@angular-devkit/architect';
+import { Observable } from 'rxjs';
+import webpack from 'webpack';
+import WebpackDevServer from 'webpack-dev-server';
+import { BuildResult, WebpackFactory, WebpackLoggingCallback } from '../webpack';
+import { Schema as WebpackDevServerBuilderSchema } from './schema';
+export type WebpackDevServerFactory = typeof WebpackDevServer;
+export type DevServerBuildOutput = BuildResult & {
+    port: number;
+    family: string;
+    address: string;
+};
+export declare function runWebpackDevServer(config: webpack.Configuration, context: BuilderContext, options?: {
+    shouldProvideStats?: boolean;
+    devServerConfig?: WebpackDevServer.Configuration;
+    logging?: WebpackLoggingCallback;
+    webpackFactory?: WebpackFactory;
+    webpackDevServerFactory?: WebpackDevServerFactory;
+}): Observable<DevServerBuildOutput>;
+declare const _default: import("../../../../architect/src/internal").Builder<WebpackDevServerBuilderSchema & import("../../../../core/src").JsonObject>;
+export default _default;

my-app/node_modules/@angular-devkit/build-webpack/src/builders/webpack-dev-server/index.js

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+"use strict";
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.runWebpackDevServer = void 0;
+const architect_1 = require("@angular-devkit/architect");
+const path_1 = require("path");
+const rxjs_1 = require("rxjs");
+const webpack_1 = __importDefault(require("webpack"));
+const webpack_dev_server_1 = __importDefault(require("webpack-dev-server"));
+const utils_1 = require("../../utils");
+function runWebpackDevServer(config, context, options = {}) {
+    const createWebpack = (c) => {
+        if (options.webpackFactory) {
+            const result = options.webpackFactory(c);
+            if ((0, rxjs_1.isObservable)(result)) {
+                return result;
+            }
+            else {
+                return (0, rxjs_1.of)(result);
+            }
+        }
+        else {
+            return (0, rxjs_1.of)((0, webpack_1.default)(c));
+        }
+    };
+    const createWebpackDevServer = (webpack, config) => {
+        if (options.webpackDevServerFactory) {
+            return new options.webpackDevServerFactory(config, webpack);
+        }
+        return new webpack_dev_server_1.default(config, webpack);
+    };
+    const log = options.logging || ((stats, config) => context.logger.info(stats.toString(config.stats)));
+    const shouldProvideStats = options.shouldProvideStats ?? true;
+    return createWebpack({ ...config, watch: false }).pipe((0, rxjs_1.switchMap)((webpackCompiler) => new rxjs_1.Observable((obs) => {
+        const devServerConfig = options.devServerConfig || config.devServer || {};
+        devServerConfig.host ??= 'localhost';
+        let result;
+        const statsOptions = typeof config.stats === 'boolean' ? undefined : config.stats;
+        webpackCompiler.hooks.done.tap('build-webpack', (stats) => {
+            // Log stats.
+            log(stats, config);
+            obs.next({
+                ...result,
+                webpackStats: shouldProvideStats ? stats.toJson(statsOptions) : undefined,
+                emittedFiles: (0, utils_1.getEmittedFiles)(stats.compilation),
+                success: !stats.hasErrors(),
+                outputPath: stats.compilation.outputOptions.path,
+            });
+        });
+        const devServer = createWebpackDevServer(webpackCompiler, devServerConfig);
+        devServer.startCallback((err) => {
+            if (err) {
+                obs.error(err);
+                return;
+            }
+            const address = devServer.server?.address();
+            if (!address) {
+                obs.error(new Error(`Dev-server address info is not defined.`));
+                return;
+            }
+            result = {
+                success: true,
+                port: typeof address === 'string' ? 0 : address.port,
+                family: typeof address === 'string' ? '' : address.family,
+                address: typeof address === 'string' ? address : address.address,
+            };
+        });
+        // Teardown logic. Close the server when unsubscribed from.
+        return () => {
+            devServer.stopCallback(() => { });
+            webpackCompiler.close(() => { });
+        };
+    })));
+}
+exports.runWebpackDevServer = runWebpackDevServer;
+exports.default = (0, architect_1.createBuilder)((options, context) => {
+    const configPath = (0, path_1.resolve)(context.workspaceRoot, options.webpackConfig);
+    return (0, rxjs_1.from)((0, utils_1.getWebpackConfig)(configPath)).pipe((0, rxjs_1.switchMap)((config) => runWebpackDevServer(config, context)));
+});

my-app/node_modules/@angular-devkit/build-webpack/src/builders/webpack-dev-server/schema.d.ts

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+/**
+ * Webpack Dev-Server Builder schema for Architect.
+ */
+export interface Schema {
+    /**
+     * The path to the Webpack configuration file.
+     */
+    webpackConfig: string;
+}

my-app/node_modules/@angular-devkit/build-webpack/src/builders/webpack-dev-server/schema.js

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+"use strict";
+// THIS FILE IS AUTOMATICALLY GENERATED. TO UPDATE THIS FILE YOU NEED TO CHANGE THE
+// CORRESPONDING JSON SCHEMA FILE, THEN RUN devkit-admin build (or bazel build ...).
+Object.defineProperty(exports, "__esModule", { value: true });

my-app/node_modules/@angular-devkit/build-webpack/src/builders/webpack-dev-server/schema.json

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+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "title": "Webpack Dev-Server Builder",
+  "description": "Webpack Dev-Server Builder schema for Architect.",
+  "type": "object",
+  "properties": {
+    "webpackConfig": {
+      "type": "string",
+      "description": "The path to the Webpack configuration file."
+    }
+  },
+  "additionalProperties": false,
+  "required": ["webpackConfig"]
+}

my-app/node_modules/@angular-devkit/build-webpack/src/builders/webpack/index.d.ts

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+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+import { BuilderContext, BuilderOutput } from '@angular-devkit/architect';
+import { Observable } from 'rxjs';
+import webpack from 'webpack';
+import { EmittedFiles } from '../../utils';
+import { Schema as RealWebpackBuilderSchema } from './schema';
+export type WebpackBuilderSchema = RealWebpackBuilderSchema;
+export interface WebpackLoggingCallback {
+    (stats: webpack.Stats, config: webpack.Configuration): void;
+}
+export interface WebpackFactory {
+    (config: webpack.Configuration): Observable<webpack.Compiler> | webpack.Compiler;
+}
+export type BuildResult = BuilderOutput & {
+    emittedFiles?: EmittedFiles[];
+    webpackStats?: webpack.StatsCompilation;
+    outputPath: string;
+};
+export declare function runWebpack(config: webpack.Configuration, context: BuilderContext, options?: {
+    logging?: WebpackLoggingCallback;
+    webpackFactory?: WebpackFactory;
+    shouldProvideStats?: boolean;
+}): Observable<BuildResult>;
+declare const _default: import("../../../../architect/src/internal").Builder<RealWebpackBuilderSchema & import("../../../../core/src").JsonObject>;
+export default _default;

my-app/node_modules/@angular-devkit/build-webpack/src/builders/webpack/index.js

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+"use strict";
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.runWebpack = void 0;
+const architect_1 = require("@angular-devkit/architect");
+const path_1 = require("path");
+const rxjs_1 = require("rxjs");
+const webpack_1 = __importDefault(require("webpack"));
+const utils_1 = require("../../utils");
+function runWebpack(config, context, options = {}) {
+    const { logging: log = (stats, config) => context.logger.info(stats.toString(config.stats)), shouldProvideStats = true, } = options;
+    const createWebpack = (c) => {
+        if (options.webpackFactory) {
+            const result = options.webpackFactory(c);
+            if ((0, rxjs_1.isObservable)(result)) {
+                return result;
+            }
+            else {
+                return (0, rxjs_1.of)(result);
+            }
+        }
+        else {
+            return (0, rxjs_1.of)((0, webpack_1.default)(c));
+        }
+    };
+    return createWebpack({ ...config, watch: false }).pipe((0, rxjs_1.switchMap)((webpackCompiler) => new rxjs_1.Observable((obs) => {
+        const callback = (err, stats) => {
+            if (err) {
+                return obs.error(err);
+            }
+            if (!stats) {
+                return;
+            }
+            // Log stats.
+            log(stats, config);
+            const statsOptions = typeof config.stats === 'boolean' ? undefined : config.stats;
+            const result = {
+                success: !stats.hasErrors(),
+                webpackStats: shouldProvideStats ? stats.toJson(statsOptions) : undefined,
+                emittedFiles: (0, utils_1.getEmittedFiles)(stats.compilation),
+                outputPath: stats.compilation.outputOptions.path,
+            };
+            if (config.watch) {
+                obs.next(result);
+            }
+            else {
+                webpackCompiler.close(() => {
+                    obs.next(result);
+                    obs.complete();
+                });
+            }
+        };
+        try {
+            if (config.watch) {
+                const watchOptions = config.watchOptions || {};
+                const watching = webpackCompiler.watch(watchOptions, callback);
+                // Teardown logic. Close the watcher when unsubscribed from.
+                return () => {
+                    watching.close(() => { });
+                    webpackCompiler.close(() => { });
+                };
+            }
+            else {
+                webpackCompiler.run(callback);
+            }
+        }
+        catch (err) {
+            if (err) {
+                context.logger.error(`\nAn error occurred during the build:\n${err instanceof Error ? err.stack : err}`);
+            }
+            throw err;
+        }
+    })));
+}
+exports.runWebpack = runWebpack;
+exports.default = (0, architect_1.createBuilder)((options, context) => {
+    const configPath = (0, path_1.resolve)(context.workspaceRoot, options.webpackConfig);
+    return (0, rxjs_1.from)((0, utils_1.getWebpackConfig)(configPath)).pipe((0, rxjs_1.switchMap)((config) => runWebpack(config, context)));
+});

my-app/node_modules/@angular-devkit/build-webpack/src/builders/webpack/schema.d.ts

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+/**
+ * Webpack Builder schema for Architect.
+ */
+export interface Schema {
+    /**
+     * The path to the Webpack configuration file.
+     */
+    webpackConfig: string;
+}

my-app/node_modules/@angular-devkit/build-webpack/src/builders/webpack/schema.js

@@ -0,0 +1,4 @@
+"use strict";
+// THIS FILE IS AUTOMATICALLY GENERATED. TO UPDATE THIS FILE YOU NEED TO CHANGE THE
+// CORRESPONDING JSON SCHEMA FILE, THEN RUN devkit-admin build (or bazel build ...).
+Object.defineProperty(exports, "__esModule", { value: true });

my-app/node_modules/@angular-devkit/build-webpack/src/builders/webpack/schema.json

@@ -0,0 +1,14 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "title": "Webpack Builder.",
+  "description": "Webpack Builder schema for Architect.",
+  "type": "object",
+  "properties": {
+    "webpackConfig": {
+      "type": "string",
+      "description": "The path to the Webpack configuration file."
+    }
+  },
+  "additionalProperties": false,
+  "required": ["webpackConfig"]
+}