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decouple watch from reactive updates #47

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decouple watch from reactive updates #47

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decouple watch from reactive updates
sorvell Mar 11, 2025
797fa67
Update 0005-standard-signals.md
sorvell Mar 11, 2025
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6 changes: 5 additions & 1 deletion rfcs/0005-standard-signals.md
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Expand Up @@ -66,7 +66,7 @@ Conceptually, we want to run the reactive update lifecycle in an effect so that
We can do this with an override of `performUpdate()` that wraps ReactiveElement's implementation in a watched computed signal:

```ts
abstract class SignalWatcher extends Base {
class SignalWatcher extends Base {
// Watcher.watch() doesn't dedupe :(
private __watching = false;
private __watcher = new Signal.subtle.Watcher(() => {
Expand Down Expand Up @@ -101,6 +101,10 @@ abstract class SignalWatcher extends Base {
}
```

### effect(callback, options)

An `effect` re-runs the provided callback any time signals accessed inside the callback are set. Effects run a microtask after any signals change. `effect` returns a dispose funcction which can be called to stop the effect from running. By providing `options`, an effect can be associated with an `element` and coordinated with its update cycle.

### watch() directive

The `watch()` async directive accepts a signal and renders its value _asynchronously_ to the containing binding. When the signal changes, the binding value is updated directly.
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