Successful with Signals: 3 Effective Rules @FrankenJS

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AngularArchitects.io | @ManfredSteyer Successful with Signals: 3 Effective Rules

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Agenda • Austrian Desserts • Computed • Effects • RxJS Interop • Stores

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Result • 3 Rules (of thumb) • 2 Hints

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About me… Manfred Steyer, ANGULARarchitects.io (Remote) Angular Workshops and Consulting Google Developer Expert for Angular Blog, Books, Articles, and Talks about Angular Manfred Steyer

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Austrian Desserts: Example App

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Demo

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Computed

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Simple Reactivity with Signals Signal 4711 Consumer read set notify 4712

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Signal Eventually Zone-less!

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flights = signal([]); const flights = await this.flightService.findAsPromise(from, to); this.flights.set(flights);

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from = signal('Paris'); to = signal('London'); flightRoute = computed(() => this.from() + ' to ' + this.to());

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Demo Branch: 01a-add-signals

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Architecture Rule #1 Synchronously derive state where possible

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Effects

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Demo Branch: 04-effects-starter

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Architecture Rule #2 Avoid effects propagating state and signal writes

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RxJS-Interop

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Demo Branch: 05-rxjs-interop-starter

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Hint #1 Signals play well together with RxJS

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Hint #2 Avoid Race Conditions (e.g. RxJS and/or loading flag)

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Stores

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Stores Streamline Reactive Flow Component Store "Intention" Signal sync/ async computed() computed()

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Demo Branch: 07-state-service-starter

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Architecture Rule #3 Stores make your reactive flow more manageable

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Free eBook (2nd Edition) angularArchitects.io/modern

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More: Angular Architecture Workshop • Maintainable Architectures with Modern Angular • Strategic Design with Nx & Sheriff • Micro Frontends with Module Federation • Signals and Your Architecture: CD & Zone-less, NGRX & Signal Store, RxJS-Interop German Version in June: Online & Interactive angulararchitects.io/workshop-de

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Conclusion Architecture Rule #1 Synchronously derive state where possible Architecture Rule #2 Avoid effects propagating state and signal writes Architecture Rule #3 Stores make your reactive flow more manageable Component Store

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Conclusion Hint #1 Signals play well together with RxJS Hint #2 Avoid Race Conditions (e.g. RxJS and/or loading flag)

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