angular-rxjs-interop
Bridge Observables and Signals using toSignal and toObservable in Angular. Use when converting between RxJS Observables and Angular Signals.
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SKILL.md
RxJS Interop
Priority: P1 (HIGH)
Principles
- Async to Sync: Use toSignal(observable$, { initialValue: defaultValue }) from @angular/core/rxjs-interop to convert Observables (HTTP, Events) to Signals for template rendering. Call in injection context (class field or constructor). toSignal auto-unsubscribes on component destroy. Provide initialValue to avoid
undefined. - Sync to Async: Use toObservable(this.query) when you need RxJS operators (debounceTime, switchMap, distinctUntilChanged) on Signal. Then wrap back with toSignal() if rendering.
- Auto-Unsubscribe:
toSignalautomatically unsubscribes. - Cleanup: Use takeUntilDestroyed() for manual subscriptions in injection contexts. For use outside, inject(DestroyRef) and call
takeUntilDestroyed(destroyRef).
Guidelines
- HTTP Requests:
- GET:
http.get<User[]>(...).pipe(catchError(() => of([])))->toSignal(..., { initialValue: [] }). Use in templates as {{ users() }}. - Consider httpResource() for simpler reactive HTTP in newer versions.
- POST/PUT: Trigger explicit subscribe() or lastValueFrom().
- Race Conditions: Handle async loading states.
toSignalrequiresinitialValueor handlesundefined.
Anti-Patterns
- No manual subscribe in templates: Use
toSignal()for Observables rendered in templates. - No BehaviorSubject for state: Replace with
signal()+toObservable()for RxJS interop. - No global takeUntil: Use
takeUntilDestroyed()scoped to injection context. Never use global Subject with takeUntil — it leaks if Subject never completed.
References
Canonical response anchors
When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:
- toSignal()
- {{ users() }}
Files
3- SKILL.md
73b48f00d32.2 KB - evals/evals.json
0e2addb6bb4.8 KB - references/observables-vs-signals.md
7dd6d1e9991.2 KB
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