AngularNestJSTypeORMRxJS

Angular + NestJS Prompt Architecture

Enterprise-grade prompts that understand Angular signals, NestJS decorators, and shared DTOs between frontend and backend.

❌ Generic AI Output

// Generic — deprecated Angular patterns
@Component({
  selector: 'app-users',
  template: `<div *ngFor="let u of users">{{u.name}}</div>`
})
export class UsersComponent implements OnInit {
  users: any[] = [];  // no types!
  ngOnInit() {
    this.http.get('/api/users').subscribe((data: any) => {
      this.users = data;
    });
  }
}

✅ Prompt Architect Output

// Prompt Architect — modern Angular 17+
@Component({
  selector: 'app-users',
  standalone: true,
  imports: [CommonModule],
  template: `
    @for (user of users(); track user.id) {
      <div class="user-card">{{ user.name }}</div>
    } @empty {
      <p>No users found.</p>
    }
  `,
  changeDetection: ChangeDetectionStrategy.OnPush,
})
export class UsersComponent {
  private readonly userService = inject(UserService);
  readonly users = toSignal(
    this.userService.getAll(),
    { initialValue: [] }
  );
}

Real Generated Output

Automated Quality Enforcement

Every prompt includes strict bans and deprecation rules tailored to your Angular + NestJS + TypeORM + RxJS stack

strict-bans.md — AI Prompt Architect

# ⛔ STRICT BANS — Enforced Constraints

## Framework Version Enforcement
- **BANNED**: React class components → Use functional components + hooks
- **BANNED**: `componentWillMount`, `componentWillUpdate` → Use `useEffect`
- **BANNED**: `getInitialState` → Use `useState` or `useReducer`
- **BANNED**: `createClass` syntax → Use arrow function components
- **BANNED**: PropTypes runtime validation → Use TypeScript interfaces
- **BANNED**: `defaultProps` static → Use ES6 default parameters

## TypeScript Enforcement
- **BANNED**: `any` type annotations → Use `unknown` + type guards
- **BANNED**: `@ts-ignore` comments → Fix the actual type error
- **BANNED**: Non-null assertions (`!`) → Use optional chaining (?.)
- **BANNED**: `enum` keyword → Use `as const` union types
- **BANNED**: `namespace` declarations → Use ES modules

## Security Constraints
- **BANNED**: `eval()`, `Function()` constructors
- **BANNED**: `innerHTML` assignments → Use `textContent` or sanitise
- **BANNED**: Hardcoded secrets, API keys, or credentials
- **BANNED**: `http://` URLs in production → Enforce `https://`
- **BANNED**: `*` CORS origins in production → Whitelist domains
- **BANNED**: SQL string concatenation → Use parameterised queries
- **BANNED**: `localStorage` for auth tokens → Use httpOnly cookies

## State Management
- **BANNED**: Prop drilling beyond 2 levels → Use Context or Zustand
- **BANNED**: `useEffect` for data fetching → Use React Query / SWR
- **BANNED**: Mutable state mutations → Use immutable update patterns
- **BANNED**: Global mutable variables → Use React state or stores

## API & Data Patterns
- **BANNED**: `fetch` without error handling → Wrap in try/catch
- **BANNED**: Untyped API responses → Define response interfaces
- **BANNED**: `console.log` in production → Use structured logger
- **BANNED**: Synchronous file I/O → Use async/await patterns
- **BANNED**: Unbounded `.find()` / `.filter()` on large arrays → Use Map/Set

## CSS & Styling
- **BANNED**: Inline styles for layout → Use CSS modules or Tailwind
- **BANNED**: `!important` overrides → Fix specificity properly
- **BANNED**: Fixed pixel breakpoints → Use relative units (rem/em)
- **BANNED**: `z-index` values > 100 → Use a z-index scale system

❌ The Problem

AI-generated Angular code ignores signals, uses deprecated patterns, and NestJS output misuses decorators and pipes.

✅ The Solution

Prompt Architect constrains to Angular 17+ signals, NestJS v10 patterns, and shared DTO validation.

Frequently Asked Questions

Does it support Angular signals?

Yes — signal(), computed(), effect(), and toSignal() from @angular/core/rxjs-interop.

Can it generate NestJS modules?

Prompts include proper module/controller/service structure with dependency injection and guards.

Does it handle shared DTOs?

Yes — class-validator decorated DTOs that work on both Angular and NestJS sides.

Technical Deep Dive

How do I set up the initial project architecture with these technologies?

Use AI Prompt Architect to generate a scaffold prompt that includes directory structure, configuration files, environment setup, and dependency installation commands tailored to your exact stack combination. The prompt enforces best-practice file organisation from the start.

See the difference yourself

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Automated Quality Enforcement

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Technical Deep Dive

See the difference yourself

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