Updated the files.

my-app/node_modules/@schematics/angular/directive/files/__name@dasherize@if-flat__/__name@dasherize__.directive.spec.ts.template

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+import { <%= classify(name) %>Directive } from './<%= dasherize(name) %>.directive';
+
+describe('<%= classify(name) %>Directive', () => {
+  it('should create an instance', () => {
+    const directive = new <%= classify(name) %>Directive();
+    expect(directive).toBeTruthy();
+  });
+});

my-app/node_modules/@schematics/angular/directive/files/__name@dasherize@if-flat__/__name@dasherize__.directive.ts.template

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+import { Directive } from '@angular/core';
+
+@Directive({
+  selector: '[<%= selector %>]'<% if(standalone) {%>,
+  standalone: true<%}%>
+})
+export class <%= classify(name) %>Directive {
+
+  constructor() { }
+
+}

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

my-app/node_modules/@schematics/angular/directive/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 add_declaration_to_ng_module_1 = require("../utility/add-declaration-to-ng-module");
+const find_module_1 = require("../utility/find-module");
+const parse_name_1 = require("../utility/parse-name");
+const validation_1 = require("../utility/validation");
+const workspace_1 = require("../utility/workspace");
+function buildSelector(options, projectPrefix) {
+    let selector = options.name;
+    if (options.prefix) {
+        selector = `${options.prefix}-${selector}`;
+    }
+    else if (options.prefix === undefined && projectPrefix) {
+        selector = `${projectPrefix}-${selector}`;
+    }
+    return schematics_1.strings.camelize(selector);
+}
+function default_1(options) {
+    return async (host) => {
+        const workspace = await (0, workspace_1.getWorkspace)(host);
+        const project = workspace.projects.get(options.project);
+        if (!project) {
+            throw new schematics_1.SchematicsException(`Project "${options.project}" does not exist.`);
+        }
+        if (options.path === undefined) {
+            options.path = (0, workspace_1.buildDefaultPath)(project);
+        }
+        options.module = (0, find_module_1.findModuleFromOptions)(host, options);
+        const parsedPath = (0, parse_name_1.parseName)(options.path, options.name);
+        options.name = parsedPath.name;
+        options.path = parsedPath.path;
+        options.selector = options.selector || buildSelector(options, project.prefix || '');
+        (0, validation_1.validateHtmlSelector)(options.selector);
+        const templateSource = (0, schematics_1.apply)((0, schematics_1.url)('./files'), [
+            options.skipTests ? (0, schematics_1.filter)((path) => !path.endsWith('.spec.ts.template')) : (0, schematics_1.noop)(),
+            (0, schematics_1.applyTemplates)({
+                ...schematics_1.strings,
+                'if-flat': (s) => (options.flat ? '' : s),
+                ...options,
+            }),
+            (0, schematics_1.move)(parsedPath.path),
+        ]);
+        return (0, schematics_1.chain)([
+            (0, add_declaration_to_ng_module_1.addDeclarationToNgModule)({
+                type: 'directive',
+                ...options,
+            }),
+            (0, schematics_1.mergeWith)(templateSource),
+        ]);
+    };
+}
+exports.default = default_1;

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

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+/**
+ * Creates a new, generic directive definition in the given project.
+ */
+export interface Schema {
+    /**
+     * The declaring NgModule exports this directive.
+     */
+    export?: boolean;
+    /**
+     * When true (the default), creates the new files at the top level of the current project.
+     */
+    flat?: boolean;
+    /**
+     * The declaring NgModule.
+     */
+    module?: string;
+    /**
+     * The name of the new directive.
+     */
+    name: string;
+    /**
+     * The path at which to create the interface that defines the directive, relative to the
+     * workspace root.
+     */
+    path?: string;
+    /**
+     * A prefix to apply to generated selectors.
+     */
+    prefix?: string;
+    /**
+     * The name of the project.
+     */
+    project: string;
+    /**
+     * The HTML selector to use for this directive.
+     */
+    selector?: string;
+    /**
+     * Do not import this directive into the owning NgModule.
+     */
+    skipImport?: boolean;
+    /**
+     * Do not create "spec.ts" test files for the new class.
+     */
+    skipTests?: boolean;
+    /**
+     * Whether the generated directive is standalone.
+     */
+    standalone?: boolean;
+}

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

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+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "$id": "SchematicsAngularDirective",
+  "title": "Angular Directive Options Schema",
+  "type": "object",
+  "description": "Creates a new, generic directive definition in the given project.",
+  "additionalProperties": false,
+  "properties": {
+    "name": {
+      "type": "string",
+      "description": "The name of the new directive.",
+      "$default": {
+        "$source": "argv",
+        "index": 0
+      },
+      "x-prompt": "What name would you like to use for the directive?"
+    },
+    "path": {
+      "type": "string",
+      "format": "path",
+      "$default": {
+        "$source": "workingDirectory"
+      },
+      "description": "The path at which to create the interface that defines the directive, relative to the workspace root.",
+      "visible": false
+    },
+    "project": {
+      "type": "string",
+      "description": "The name of the project.",
+      "$default": {
+        "$source": "projectName"
+      }
+    },
+    "prefix": {
+      "type": "string",
+      "description": "A prefix to apply to generated selectors.",
+      "alias": "p",
+      "oneOf": [
+        {
+          "maxLength": 0
+        },
+        {
+          "minLength": 1,
+          "format": "html-selector"
+        }
+      ]
+    },
+    "skipTests": {
+      "type": "boolean",
+      "description": "Do not create \"spec.ts\" test files for the new class.",
+      "default": false
+    },
+    "skipImport": {
+      "type": "boolean",
+      "description": "Do not import this directive into the owning NgModule.",
+      "default": false
+    },
+    "selector": {
+      "type": "string",
+      "format": "html-selector",
+      "description": "The HTML selector to use for this directive."
+    },
+    "standalone": {
+      "description": "Whether the generated directive is standalone.",
+      "type": "boolean",
+      "default": true,
+      "x-user-analytics": "ep.ng_standalone"
+    },
+    "flat": {
+      "type": "boolean",
+      "description": "When true (the default), creates the new files at the top level of the current project.",
+      "default": true
+    },
+    "module": {
+      "type": "string",
+      "description": "The declaring NgModule.",
+      "alias": "m"
+    },
+    "export": {
+      "type": "boolean",
+      "default": false,
+      "description": "The declaring NgModule exports this directive."
+    }
+  },
+  "required": ["name", "project"]
+}