External module "sinks/extract-first"

extractFirst

• extractFirst<T>(o: Observable<T>): Promise<T>

• Resolves with the first element emitted by the observable, then releases the observable. If no items are emitted the promise is rejected.

  Type parameters

  • T

    Type of items emitted by the observable.

  Parameters

  • o: Observable<T>

    Observable to extract from.

  Returns Promise<T>

  Promise that resolves with a single item.