angular-components
Build standalone Angular components with Signals inputs, OnPush change detection, Control Flow, and Smart/Dumb patterns. Use when building standalone Angular components, implementing @if/@for control flow, applying OnPush change detection, or implementing Signals in Angular components.
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SKILL.md
Angular Components
Priority: P0 (CRITICAL)
Standalone & Structure
- Standalone:
standalone: true. Import all deps inimportsarray. No NgModule. (Angular 20+: standalone default.) - Smart/Dumb Split: Smart (Container) → inject services, manage state. Presentational (Dumb) → accept inputs and emit events via outputs only; no service dependencies.
- Host Bindings: Define in
host: { }on@Component(e.g.,'[class.active]': 'isActive()') — never use @HostBinding/@HostListener. - View Encapsulation: Default
Emulated. UseNonecarefully.
Signals & Change Detection
- OnPush: ALWAYS use
ChangeDetectionStrategy.OnPush. No exceptions. - Signal Inputs:
input.required<T>()orinput<T>()not@Input(). Access as functions:{{ userId() }}. UsebooleanAttribute/numberAttributetransforms. - Signal Outputs:
output<T>()(v17.3+) not@Output() EventEmitter. Two-way binding:model(). - State:
signal()local,computed()derived,effect()side effects only. - Cleanup:
toSignal()(auto-unsubscribes),takeUntilDestroyed(), orDestroyRef. Neversubscribe()without cleanup.
Control Flow
- Use
@if (condition),@for (item of items; track item.id),@switch,@empty { }instead of*ngIf/*ngFor(new control flow syntax, Angular 17+).
Anti-Patterns
- No default CD: OnPush only — default re-checks every component every event.
- No functions in templates:
{{ calculate() }}re-evaluates every cycle →computed()instead. - No manual subscribe:
asyncpipe ortoSignal. Neversubscribe()without cleanup. - No ElementRef mutation: Directives or Renderer2.
- No class inheritance: Compose with Directives and Services.
References
Canonical response anchors
When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:
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@empty { }
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Never use @HostBinding
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Signal inputs
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inputs and emit events via outputs
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Additional task-grounded exact anchors: @if (condition); @for (item of items; track item.id); booleanAttribute; model(); Smart (Container); toSignal()
Files
4- SKILL.md
41650e97172.8 KB - evals/evals.json
b42991f99f5.4 KB - references/control-flow.md
01ccdda191556 B - references/standalone-pattern.md
45ebb2648e654 B
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