Function asyncSignal

Takes an async source (Promise, Observable) or signal/function that returns an async source and returns that source's values as part of a signal. Kind of like an rxjs flattening operator. When the async source changes, the old source is immediately released and the new source is listened.

Param: valueSource

A Promise or Subscribable to create writable signal, otherwise a signal or function that returns a Promise or Subscribable.

Param: options

The options for the async signal

Returns

a signal that returns values from the async source..

Example

$id = signal(0);
// call getCustomer every time $id changes.
$customer = asyncSignal(() => this.$id() !== 0 ? this.getCustomer(this.$id()) : undefined);

constructor() {
  // writable overload can switch versions.
  const artificialWritableExampleSource1 = new BehaviorSubject(1);
  const $writable = asyncSignal(artificialWritableExampleSource1);
  const artificialWritableExampleSource2 = new BehaviorSubject(2);
  $writable.set(artificialWritableExampleSource2);
}

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