Angular Signal Generators
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    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.

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

    The options for the async signal

    a signal that returns values from the async source..

    $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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