angular-directives-pipes
Build custom Angular attribute directives, HostDirectives, and pure pipes. Use for Angular directive or pipe implementation, including custom attribute directives; defer React/CSS middleware and unrelated framework work.
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SKILL.md
Directives & Pipes
Priority: P2 (MEDIUM)
Principles
- Composition: Use hostDirectives: [TooltipDirective] on
@Componentor@Directivedecorators to compose behaviors without inheritance. Expose inputs/outputs via hostDirectives: [{ directive: TooltipDirective, inputs: ['text'] }]. - Pure Pipes: Decorate with
@Pipe({ name: 'truncate', standalone: true, pure: true }). Implement PipeTransform withtransform(value: string, limit = 50)method. Pipes must pure: true (default) to cache results by input reference — Angular only re-runs them when reference changes. ** not set pure: false** unless handling Observables/Arrays that mutate. - Directive Logic: Encapsulate reusable DOM manipulation or behavioral logic in standalone: true Directives (e.g., selector: '[appHighlight]'). Inject ElementRef/Renderer2 for DOM access.
Guidelines
- Signal Inputs: Directives and Pipes support signal inputs.
- Standalone: All Pipes and Directives must standalone. ** not declare in NgModule**; import directly in component imports array. Use ng generate directive to scaffold.
Anti-Patterns
- No @HostBinding/@HostListener: Use host: {} object in
@Directivedecorator — not with @HostBinding or @HostListener (e.g., '(mouseenter)': 'show()', '[attr.aria-label]': 'text()') — these decorators deprecated patterns. - No impure pipes for static transforms: Keep
pure: true(default); useasyncpipe for Observables. - No structural directives for conditionals: Use native
@if/@for/@switchblock syntax.
References
Canonical response anchors
When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:
- cache results
- host: {} object
- imports array
- not set pure: false
- not with @HostBinding
Files
3- SKILL.md
108535d6e22.3 KB - evals/evals.json
74291f593c4.7 KB - references/composition.md
0b53915188537 B
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