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Angular 20 : Giving the correct prompt’s for LLMs

Erika Rykun
June 23, 2025
angular-20-:-giving-the-correct-prompt’s-for-llms
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TypeScript Best Practices

TypeScript is the foundation of Angular applications. Clean, type-safe code reduces bugs and enhances maintainability.

Use Strict Type Checking

Enable strict mode in your tsconfig.json to catch potential issues at compile time. 

{
  "compilerOptions": {
    "strict": true
  }
}

Prefer Type Inference

Let TypeScript infer types when the type is obvious, to reduce verbosity: 

const name = 'Angular'; // inferred as string

Avoid any; Use unknown Instead

Using any disables type checking. If you must accept uncertain data, prefer unknown and refine it safely: 

function process(data: unknown) {
  if (typeof data === 'string') {
    console.log(data.toUpperCase());
  }
}

Angular Best Practices

Angular has shifted away from NgModules in favor of a simpler, more streamlined approach using standalone components.

Prefer Standalone Components

Standalone components are easier to manage and eliminate NgModule complexity. 

@Component({
  standalone: true,
  selector: 'app-hello',
  template: '
Hello Angular
',
})
export class HelloComponent {}

Note: standalone: true is implied by default in newer Angular versions, so you can omit it.

Use Signals for State

Angular signals offer a reactive, fine-grained change detection alternative to traditional observables or inputs. 

const count = signal(0);

Implement Lazy Loading for Feature Routes

Improves performance by only loading feature code when needed: 

{
  path: 'feature',
  loadComponent: () => import('./feature.component').then(m => m.FeatureComponent),
}

Use NgOptimizedImage for Static Images

This directive automatically optimizes images for faster load and better performance:

🧩 Component Best Practices

Components should be small, focused, and use modern APIs.

Use input() and output() Functions

This approach replaces decorators with function-based metadata, improving clarity: 

@Component({ standalone: true, template: '' })
export class ChildComponent {
  name = input<string>();
  clicked = output<void>();
}

Use computed() for Derived State

Avoid duplicating logic by using computed(): 

const firstName = signal('John');
const lastName = signal('Doe');
const fullName = computed(() => `${firstName()} ${lastName()}`);

Use ChangeDetectionStrategy.OnPush

Improves performance by reducing unnecessary checks: 

@Component({
  changeDetection: ChangeDetectionStrategy.OnPush
})
export class EfficientComponent {

Prefer Reactive Forms

Reactive forms are easier to test and scale compared to template-driven forms.

Avoid Deprecated Binding Patterns

Replace these legacy binding strategies:

Deprecated Use Instead
ngClass [class]
ngStyle [style] 

 [class.active]="isActive">
[style.backgroundColor]="color">

Template Best Practices

Templates should be simple, declarative, and free of business logic.

Use Native Control Flow

Angular now supports control flow blocks similar to JavaScript: 

@for (item of items; track item.id) {
  
{{ item.name }}

}

@if (isLoggedIn) {
  
Welcome back!

} @else {
  
Please log in

}

Use the Async Pipe

Avoid manually subscribing to observables—use the async pipe: 

 *ngIf="user$ | async as user">{{ user.name }}

State Management

Simple, predictable state is key to scalable applications.

Use Signals for Local State

Signals provide reactive state management without the overhead of external libraries. 

const theme = signal<'light' | 'dark'>('light');

Keep State Transformations Pure

Avoid side effects in computed values or signal transformations: 

function getTotal(price: number, qty: number): number {
  return price * qty;
}

Services Best Practices

Services should follow single responsibility and use modern dependency injection.

Use providedIn: 'root'

This ensures a singleton service is available throughout the app without needing to declare it in providers: 

@Injectable({ providedIn: 'root' })
export class AuthService {
  login() { /* ... */ }
}

Use inject() Function

Use inject() instead of constructor injection for better tree-shaking and flexibility: 

export class DashboardComponent {
  private authService = inject(AuthService);
}

Conclusion

These best practices represent Angular’s modern philosophy: minimal, reactive, and highly performant. Whether you’re coding by hand or working with AI code generation, following these principles ensures you’re building Angular applications that are:

  • Scalable and modular
  • Easier to test and maintain
  • Optimized for performance
  • Aligned with future Angular updates

📎 Official guide:

👉 https://angular.dev/ai/develop-with-ai

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