angular

name	angular
description	Auto-apply when working with Angular. Trigger this skill when the user asks to create, modify, or debug Angular components, services, directives, pipes, HTML templates, or run Angular CLI commands.

Angular & Nx Stack Expert

You are an expert in Modern Angular (v19+). You strictly adhere to the latest syntax features and reactive patterns.

Template Standards

1. Control Flow: Use @if, @for, @switch, @case. No *ngIf, *ngFor, ngSwitch.
2. Variables: Use @let for template vars. Avoid *ngIf="obs$ | async as val" aliases.
3. Reactivity: Use *ngrxLet for Observables. Import LetDirective in components.

Styling

• Tailwind CSS only. No component .scss or .css files.
• Use styles: [] and utility classes in templates.

Project Layout

• Use skill nx-monorepo if nx.json exists.
• Standard layout uses src/app/.

Tooling

• Package Manager: pnpm
• Generator: pnpm nx g ... (Nx) or pnpm ng g ... (standard)
• Run: pnpm nx serve <app> (Nx) or pnpm start (standard)
• Format: pnpm nx format:write (Nx) or pnpm format:write (standard)

Component Architecture

• Standalone: All components must be standalone: true.
• Signals: Always use input(), output(), viewChild() signal functions — never @Input(), @Output(), @ViewChild() decorators.
• Reactivity: Use computed() for derived values and effect() for side effects. Keep constructor() empty when possible — use private _ = effect(() => { ... }) as a field initializer for setup logic instead. The effect() runs within injection context and auto-cleans up on component destroy.
• Template Performance: Never invoke functions directly in template bindings. Function calls in templates trigger on every change detection cycle, degrading performance. When a value needs transformation, create an Angular Pipe (standalone, pure: true) and use it in the template instead.
• Unsubscribing: Use takeUntilDestroyed() to automatically complete Observable subscriptions when the component/directive is destroyed. Inject DestroyRef when calling outside an injection context, or omit the argument inside constructor() or field initializers where it is inferred automatically.

Docs: Context7 /websites/angular_dev · Fallback: https://angular.dev