Updated the files.

my-app/node_modules/@schematics/angular/resolver/class-files/__name@dasherize__.resolver.spec.ts.template

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

my-app/node_modules/@schematics/angular/resolver/class-files/__name@dasherize__.resolver.ts.template

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+import { Injectable } from '@angular/core';
+import {
+  Router, Resolve,
+  RouterStateSnapshot,
+  ActivatedRouteSnapshot
+} from '@angular/router';
+import { Observable, of } from 'rxjs';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class <%= classify(name) %>Resolver implements Resolve<boolean> {
+  resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean> {
+    return of(true);
+  }
+}

my-app/node_modules/@schematics/angular/resolver/functional-files/__name@dasherize__.resolver.spec.ts.template

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+import { TestBed } from '@angular/core/testing';
+import { ResolveFn } from '@angular/router';
+
+import { <%= camelize(name) %>Resolver } from './<%= dasherize(name) %>.resolver';
+
+describe('<%= camelize(name) %>Resolver', () => {
+  const executeResolver: ResolveFn<boolean> = (...resolverParameters) => 
+      TestBed.runInInjectionContext(() => <%= camelize(name) %>Resolver(...resolverParameters));
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({});
+  });
+
+  it('should be created', () => {
+    expect(executeResolver).toBeTruthy();
+  });
+});

my-app/node_modules/@schematics/angular/resolver/functional-files/__name@dasherize__.resolver.ts.template

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+import { ResolveFn } from '@angular/router';
+
+export const <%= camelize(name) %>Resolver: ResolveFn<boolean> = (route, state) => {
+  return true;
+};

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

my-app/node_modules/@schematics/angular/resolver/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 generate_from_files_1 = require("../utility/generate-from-files");
+function default_1(options) {
+    return options.functional
+        ? (0, generate_from_files_1.generateFromFiles)({ ...options, templateFilesDirectory: './functional-files' })
+        : (0, generate_from_files_1.generateFromFiles)({ ...options, templateFilesDirectory: './class-files' });
+}
+exports.default = default_1;

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

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+/**
+ * Generates a new, generic resolver 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;
+    /**
+     * Creates the resolver as a `ResolveFn`.
+     */
+    functional?: boolean;
+    /**
+     * The name of the new resolver.
+     */
+    name: string;
+    /**
+     * The path at which to create the interface that defines the resolver, relative to the
+     * current workspace.
+     */
+    path?: string;
+    /**
+     * The name of the project.
+     */
+    project: string;
+    /**
+     * Do not create "spec.ts" test files for the new resolver.
+     */
+    skipTests?: boolean;
+}

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

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+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "$id": "SchematicsAngularResolver",
+  "title": "Angular resolver Options Schema",
+  "type": "object",
+  "additionalProperties": false,
+  "description": "Generates a new, generic resolver definition in the given project.",
+  "properties": {
+    "name": {
+      "type": "string",
+      "description": "The name of the new resolver.",
+      "$default": {
+        "$source": "argv",
+        "index": 0
+      },
+      "x-prompt": "What name would you like to use for the resolver?"
+    },
+    "skipTests": {
+      "type": "boolean",
+      "description": "Do not create \"spec.ts\" test files for the new resolver.",
+      "default": false
+    },
+    "flat": {
+      "type": "boolean",
+      "description": "When true (the default), creates the new files at the top level of the current project.",
+      "default": true
+    },
+    "functional": {
+      "type": "boolean",
+      "description": "Creates the resolver as a `ResolveFn`.",
+      "default": true
+    },
+    "path": {
+      "type": "string",
+      "format": "path",
+      "$default": {
+        "$source": "workingDirectory"
+      },
+      "description": "The path at which to create the interface that defines the resolver, relative to the current workspace.",
+      "visible": false
+    },
+    "project": {
+      "type": "string",
+      "description": "The name of the project.",
+      "$default": {
+        "$source": "projectName"
+      }
+    }
+  },
+  "required": ["name", "project"]
+}