This content originally appeared on DEV Community and was authored by Ahmad Alhafi
The Signals that were Developer Preview in Angular v17 are now stable 🙂↕️
These include the view/content queries (viewChild, viewChildren, contentChild, contentChildren) and also output.
If you want a refresher on them, check out this post:
https://lnkd.in/dN_kPEhu
What’s new in Angular 19?
🎗 linkedSignal()
Remember computed() signals? linkedSignal() works similarly, but it’s writable.
It derives its value from another signal
You can also manually update it anytime you want
Example:
const count = linkedSignal(() => list().length);
count.set(0); // You can manually set it now, even though it’s derived
The next three signals are designed for reactive handling of async data, providing signals for loading, error, and value states.
🎗 resource()
A reactive API for managing async data (HTTP calls, loading, etc).
Provides loading, error, and value states as Signals
Supports reload and abort unnecessary operations (abortSignal)
Usage:
things.value();
things.error();
things.loading();
🎗 httpResource()
A specialized version of resource() for HTTP requests using Angular HttpClient.
Instead of building a resource from scratch:
const things = httpResource({
request: () => this.http.get('/api/things'),
});
Access states the same way:
things.value();
things.error();
things.loading();
🎗 rxResource()
For when you want to keep using RxJS Observables within Signals.
Instead of manually converting an Observable to a Signal (toSignal()), it wraps it automatically.
things.value();
things.error();
things.loading();
🐧 Quick comparison
resource() → base API, you can build any resource (not just HTTP)
httpResource() → ready-to-use specialization for HTTP requests using Angular HttpClient
rxResource() → specialization for RxJS Observables to work seamlessly in the Signals ecosystem
⚠️ All these new Signals in Angular 19 are Developer Preview.
And that’s it!
If you’re still unsure how it works, check out this post:
https://lnkd.in/dvFG2P3d
This content originally appeared on DEV Community and was authored by Ahmad Alhafi
Ahmad Alhafi | Sciencx (2025-08-26T19:47:19+00:00) Angular 19 — What’s up with Signals?. Retrieved from https://www.scien.cx/2025/08/26/angular-19-whats-up-with-signals/
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