Angular 20 : Giving the correct prompt’s for LLMs

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:

 [class.active]="isActive">