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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.md2.2 KB
  • evals/evals.json4.8 KB
  • references/observables-vs-signals.md1.2 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

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: toSignal automatically 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. toSignal requires initialValue or handles undefined.

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() }}

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