Updated the files.

my-app/node_modules/@schematics/angular/config/files/.browserslistrc.template

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+# This file is used by the build system to adjust CSS and JS output to support the specified browsers below.
+# For additional information regarding the format and rule options, please see:
+# https://github.com/browserslist/browserslist#queries
+
+# For the full list of supported browsers by the Angular framework, please see:
+# https://angular.io/guide/browser-support
+
+# You can see what browsers were selected by your queries by running:
+#   npx browserslist
+
+last 2 Chrome versions
+last 1 Firefox version
+last 2 Edge major versions
+last 2 Safari major versions
+last 2 iOS major versions
+Firefox ESR

my-app/node_modules/@schematics/angular/config/files/karma.conf.js.template

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+// Karma configuration file, see link for more information
+// https://karma-runner.github.io/1.0/config/configuration-file.html
+
+module.exports = function (config) {
+  config.set({
+    basePath: '',
+    frameworks: ['jasmine', '@angular-devkit/build-angular'],
+    plugins: [
+      require('karma-jasmine'),
+      require('karma-chrome-launcher'),
+      require('karma-jasmine-html-reporter'),
+      require('karma-coverage'),
+      require('@angular-devkit/build-angular/plugins/karma')
+    ],
+    client: {
+      jasmine: {
+        // you can add configuration options for Jasmine here
+        // the possible options are listed at https://jasmine.github.io/api/edge/Configuration.html
+        // for example, you can disable the random execution with `random: false`
+        // or set a specific seed with `seed: 4321`
+      },
+      clearContext: false // leave Jasmine Spec Runner output visible in browser
+    },
+    jasmineHtmlReporter: {
+      suppressAll: true // removes the duplicated traces
+    },
+    coverageReporter: {
+      dir: require('path').join(__dirname, '<%= relativePathToWorkspaceRoot %>/coverage/<%= folderName %>'),
+      subdir: '.',
+      reporters: [
+        { type: 'html' },
+        { type: 'text-summary' }
+      ]
+    },
+    reporters: ['progress', 'kjhtml'],
+    browsers: ['Chrome'],
+    restartOnFileChange: true
+  });
+};

my-app/node_modules/@schematics/angular/config/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 { Rule } from '@angular-devkit/schematics';
+import { Schema as ConfigOptions } from './schema';
+export default function (options: ConfigOptions): Rule;

my-app/node_modules/@schematics/angular/config/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
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+const schematics_1 = require("@angular-devkit/schematics");
+const utility_1 = require("@schematics/angular/utility");
+const path_1 = require("path");
+const paths_1 = require("../utility/paths");
+const schema_1 = require("./schema");
+function default_1(options) {
+    switch (options.type) {
+        case schema_1.Type.Karma:
+            return addKarmaConfig(options);
+        case schema_1.Type.Browserslist:
+            return addBrowserslistConfig(options);
+        default:
+            throw new schematics_1.SchematicsException(`"${options.type}" is an unknown configuration file type.`);
+    }
+}
+exports.default = default_1;
+function addBrowserslistConfig(options) {
+    return async (host) => {
+        const workspace = await (0, utility_1.readWorkspace)(host);
+        const project = workspace.projects.get(options.project);
+        if (!project) {
+            throw new schematics_1.SchematicsException(`Project name "${options.project}" doesn't not exist.`);
+        }
+        return (0, schematics_1.mergeWith)((0, schematics_1.apply)((0, schematics_1.url)('./files'), [
+            (0, schematics_1.filter)((p) => p.endsWith('.browserslistrc.template')),
+            (0, schematics_1.applyTemplates)({}),
+            (0, schematics_1.move)(project.root),
+        ]));
+    };
+}
+function addKarmaConfig(options) {
+    return (0, utility_1.updateWorkspace)((workspace) => {
+        const project = workspace.projects.get(options.project);
+        if (!project) {
+            throw new schematics_1.SchematicsException(`Project name "${options.project}" doesn't not exist.`);
+        }
+        const testTarget = project.targets.get('test');
+        if (!testTarget) {
+            throw new schematics_1.SchematicsException(`No "test" target found for project "${options.project}".` +
+                ' A "test" target is required to generate a karma configuration.');
+        }
+        if (testTarget.builder !== utility_1.AngularBuilder.Karma) {
+            throw new schematics_1.SchematicsException(`Cannot add a karma configuration as builder for "test" target in project does not use "${utility_1.AngularBuilder.Karma}".`);
+        }
+        testTarget.options ??= {};
+        testTarget.options.karmaConfig = path_1.posix.join(project.root, 'karma.conf.js');
+        // If scoped project (i.e. "@foo/bar"), convert dir to "foo/bar".
+        let folderName = options.project.startsWith('@') ? options.project.slice(1) : options.project;
+        if (/[A-Z]/.test(folderName)) {
+            folderName = schematics_1.strings.dasherize(folderName);
+        }
+        return (0, schematics_1.mergeWith)((0, schematics_1.apply)((0, schematics_1.url)('./files'), [
+            (0, schematics_1.filter)((p) => p.endsWith('karma.conf.js.template')),
+            (0, schematics_1.applyTemplates)({
+                relativePathToWorkspaceRoot: (0, paths_1.relativePathToWorkspaceRoot)(project.root),
+                folderName,
+            }),
+            (0, schematics_1.move)(project.root),
+        ]));
+    });
+}

my-app/node_modules/@schematics/angular/config/schema.d.ts

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+/**
+ * Generates a configuration file in the given project.
+ */
+export interface Schema {
+    /**
+     * The name of the project.
+     */
+    project: string;
+    /**
+     * Specifies which type of configuration file to create.
+     */
+    type: Type;
+}
+/**
+ * Specifies which type of configuration file to create.
+ */
+export declare enum Type {
+    Browserslist = "browserslist",
+    Karma = "karma"
+}

my-app/node_modules/@schematics/angular/config/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 });
+exports.Type = void 0;
+/**
+ * Specifies which type of configuration file to create.
+ */
+var Type;
+(function (Type) {
+    Type["Browserslist"] = "browserslist";
+    Type["Karma"] = "karma";
+})(Type || (exports.Type = Type = {}));

my-app/node_modules/@schematics/angular/config/schema.json

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+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "$id": "SchematicsAngularConfig",
+  "title": "Angular Config File Options Schema",
+  "type": "object",
+  "additionalProperties": false,
+  "description": "Generates a configuration file in the given project.",
+  "properties": {
+    "project": {
+      "type": "string",
+      "description": "The name of the project.",
+      "$default": {
+        "$source": "projectName"
+      }
+    },
+    "type": {
+      "type": "string",
+      "description": "Specifies which type of configuration file to create.",
+      "enum": ["karma", "browserslist"],
+      "x-prompt": "Which type of configuration file would you like to create?",
+      "$default": {
+        "$source": "argv",
+        "index": 0
+      }
+    }
+  },
+  "required": ["project", "type"]
+}