rxjs
Version:
Reactive Extensions for modern JavaScript
20 lines • 948 B
TypeScript
import { ObservableInput, ObservedValueOf, OperatorFunction } from '../types';
/**
* Applies an accumulator function over the source Observable where the
* accumulator function itself returns an Observable, emitting values
* only from the most recently returned Observable.
*
* <span class="informal">It's like {@link mergeScan}, but only the most recent
* Observable returned by the accumulator is merged into the outer Observable.</span>
*
* @see {@link scan}
* @see {@link mergeScan}
* @see {@link switchMap}
*
* @param accumulator
* The accumulator function called on each source value.
* @param seed The initial accumulation value.
* @return A function that returns an observable of the accumulated values.
*/
export declare function switchScan<T, R, O extends ObservableInput<any>>(accumulator: (acc: R, value: T, index: number) => O, seed: R): OperatorFunction<T, ObservedValueOf<O>>;
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