Updated the files.

my-app/node_modules/@schematics/angular/guard/implements-files/__name@dasherize__.guard.spec.ts.template

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+import { TestBed } from '@angular/core/testing';
+
+import { <%= classify(name) %>Guard } from './<%= dasherize(name) %>.guard';
+
+describe('<%= classify(name) %>Guard', () => {
+  let guard: <%= classify(name) %>Guard;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({});
+    guard = TestBed.inject(<%= classify(name) %>Guard);
+  });
+
+  it('should be created', () => {
+    expect(guard).toBeTruthy();
+  });
+});

my-app/node_modules/@schematics/angular/guard/implements-files/__name@dasherize__.guard.ts.template

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+import { Injectable } from '@angular/core';
+import { <%= routerImports %> } from '@angular/router';
+import { Observable } from 'rxjs';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class <%= classify(name) %>Guard implements <%= implementations %> {
+  <% if (implements.includes('CanActivate')) { %>canActivate(
+    route: ActivatedRouteSnapshot,
+    state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
+    return true;
+  }
+  <% } %><% if (implements.includes('CanActivateChild')) { %>canActivateChild(
+    childRoute: ActivatedRouteSnapshot,
+    state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
+    return true;
+  }
+  <% } %><% if (implements.includes('CanDeactivate')) { %>canDeactivate(
+    component: unknown,
+    currentRoute: ActivatedRouteSnapshot,
+    currentState: RouterStateSnapshot,
+    nextState?: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
+    return true;
+  }
+  <% } %><% if (implements.includes('CanMatch')) { %>canMatch(
+    route: Route,
+    segments: UrlSegment[]): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
+    return true;
+  }<% } %>
+}

my-app/node_modules/@schematics/angular/guard/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 GuardOptions } from './schema';
+export default function (options: GuardOptions): Rule;

my-app/node_modules/@schematics/angular/guard/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 generate_from_files_1 = require("../utility/generate-from-files");
+const schema_1 = require("./schema");
+function default_1(options) {
+    if (!options.implements) {
+        throw new schematics_1.SchematicsException('Option "implements" is required.');
+    }
+    if (options.implements.length > 1 && options.functional) {
+        throw new schematics_1.SchematicsException('Can only specify one value for implements when generating a functional guard.');
+    }
+    if (options.functional) {
+        const guardType = options.implements[0] + 'Fn';
+        return (0, generate_from_files_1.generateFromFiles)({ ...options, templateFilesDirectory: './type-files' }, { guardType });
+    }
+    else {
+        const implementations = options.implements
+            .map((implement) => (implement === 'CanDeactivate' ? 'CanDeactivate<unknown>' : implement))
+            .join(', ');
+        const commonRouterNameImports = ['ActivatedRouteSnapshot', 'RouterStateSnapshot'];
+        const routerNamedImports = [...options.implements, 'UrlTree'];
+        if (options.implements.includes(schema_1.Implement.CanMatch)) {
+            routerNamedImports.push('Route', 'UrlSegment');
+            if (options.implements.length > 1) {
+                routerNamedImports.push(...commonRouterNameImports);
+            }
+        }
+        else {
+            routerNamedImports.push(...commonRouterNameImports);
+        }
+        routerNamedImports.sort();
+        const routerImports = routerNamedImports.join(', ');
+        return (0, generate_from_files_1.generateFromFiles)({ ...options, templateFilesDirectory: './implements-files' }, {
+            implementations,
+            routerImports,
+        });
+    }
+}
+exports.default = default_1;

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

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+/**
+ * Generates a new, generic route guard definition in the given project.
+ */
+export interface Schema {
+    /**
+     * When true (the default), creates the new files at the top level of the current project.
+     */
+    flat?: boolean;
+    /**
+     * Specifies whether to generate a guard as a function.
+     */
+    functional?: boolean;
+    /**
+     * Specifies which type of guard to create.
+     */
+    implements?: Implement[];
+    /**
+     * The name of the new route guard.
+     */
+    name: string;
+    /**
+     * The path at which to create the interface that defines the guard, relative to the current
+     * workspace.
+     */
+    path?: string;
+    /**
+     * The name of the project.
+     */
+    project: string;
+    /**
+     * Do not create "spec.ts" test files for the new guard.
+     */
+    skipTests?: boolean;
+}
+export declare enum Implement {
+    CanActivate = "CanActivate",
+    CanActivateChild = "CanActivateChild",
+    CanDeactivate = "CanDeactivate",
+    CanMatch = "CanMatch"
+}

my-app/node_modules/@schematics/angular/guard/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.Implement = void 0;
+var Implement;
+(function (Implement) {
+    Implement["CanActivate"] = "CanActivate";
+    Implement["CanActivateChild"] = "CanActivateChild";
+    Implement["CanDeactivate"] = "CanDeactivate";
+    Implement["CanMatch"] = "CanMatch";
+})(Implement || (exports.Implement = Implement = {}));

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

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+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "$id": "SchematicsAngularGuard",
+  "title": "Angular Guard Options Schema",
+  "type": "object",
+  "description": "Generates a new, generic route guard definition in the given project.",
+  "additionalProperties": false,
+  "properties": {
+    "name": {
+      "type": "string",
+      "description": "The name of the new route guard.",
+      "$default": {
+        "$source": "argv",
+        "index": 0
+      },
+      "x-prompt": "What name would you like to use for the guard?"
+    },
+    "skipTests": {
+      "type": "boolean",
+      "description": "Do not create \"spec.ts\" test files for the new guard.",
+      "default": false
+    },
+    "flat": {
+      "type": "boolean",
+      "description": "When true (the default), creates the new files at the top level of the current project.",
+      "default": true
+    },
+    "path": {
+      "type": "string",
+      "format": "path",
+      "$default": {
+        "$source": "workingDirectory"
+      },
+      "description": "The path at which to create the interface that defines the guard, relative to the current workspace.",
+      "visible": false
+    },
+    "project": {
+      "type": "string",
+      "description": "The name of the project.",
+      "$default": {
+        "$source": "projectName"
+      }
+    },
+    "functional": {
+      "type": "boolean",
+      "description": "Specifies whether to generate a guard as a function.",
+      "default": true
+    },
+    "implements": {
+      "alias": "guardType",
+      "type": "array",
+      "description": "Specifies which type of guard to create.",
+      "uniqueItems": true,
+      "minItems": 1,
+      "items": {
+        "enum": ["CanActivate", "CanActivateChild", "CanDeactivate", "CanMatch"],
+        "type": "string"
+      },
+      "default": ["CanActivate"],
+      "x-prompt": "Which type of guard would you like to create?"
+    }
+  },
+  "required": ["name", "project"]
+}

my-app/node_modules/@schematics/angular/guard/type-files/__name@dasherize__.guard.spec.ts.template

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+import { TestBed } from '@angular/core/testing';
+import { <%= guardType %> } from '@angular/router';
+
+import { <%= camelize(name) %>Guard } from './<%= dasherize(name) %>.guard';
+
+describe('<%= camelize(name) %>Guard', () => {
+  const executeGuard: <%= guardType %> = (...guardParameters) => 
+      TestBed.runInInjectionContext(() => <%= camelize(name) %>Guard(...guardParameters));
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({});
+  });
+
+  it('should be created', () => {
+    expect(executeGuard).toBeTruthy();
+  });
+});

my-app/node_modules/@schematics/angular/guard/type-files/__name@dasherize__.guard.ts.template

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+import { <%= guardType %> } from '@angular/router';
+
+export const <%= camelize(name) %>Guard: <%= guardType %><% if (guardType === 'CanDeactivateFn') { %><unknown><% } %> = <%
+  if (guardType === 'CanMatchFn') { %>(route, segments)<% }
+  %><% if (guardType === 'CanActivateFn') { %>(route, state)<% }
+  %><% if (guardType === 'CanActivateChildFn') { %>(childRoute, state)<% }
+  %><% if (guardType === 'CanDeactivateFn') { %>(component, currentRoute, currentState, nextState)<% } %> => {
+  return true;
+};