work.suroh.tk/node_modules/rxjs/operator/combineAll.d.ts

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2019-12-02 12:22:45 +00:00
import { Observable } from '../Observable';
/**
* Converts a higher-order Observable into a first-order Observable by waiting
* for the outer Observable to complete, then applying {@link combineLatest}.
*
* <span class="informal">Flattens an Observable-of-Observables by applying
* {@link combineLatest} when the Observable-of-Observables completes.</span>
*
* <img src="./img/combineAll.png" width="100%">
*
* Takes an Observable of Observables, and collects all Observables from it.
* Once the outer Observable completes, it subscribes to all collected
* Observables and combines their values using the {@link combineLatest}
* strategy, such that:
* - Every time an inner Observable emits, the output Observable emits.
* - When the returned observable emits, it emits all of the latest values by:
* - If a `project` function is provided, it is called with each recent value
* from each inner Observable in whatever order they arrived, and the result
* of the `project` function is what is emitted by the output Observable.
* - If there is no `project` function, an array of all of the most recent
* values is emitted by the output Observable.
*
* @example <caption>Map two click events to a finite interval Observable, then apply combineAll</caption>
* var clicks = Rx.Observable.fromEvent(document, 'click');
* var higherOrder = clicks.map(ev =>
* Rx.Observable.interval(Math.random()*2000).take(3)
* ).take(2);
* var result = higherOrder.combineAll();
* result.subscribe(x => console.log(x));
*
* @see {@link combineLatest}
* @see {@link mergeAll}
*
* @param {function} [project] An optional function to map the most recent
* values from each inner Observable into a new result. Takes each of the most
* recent values from each collected inner Observable as arguments, in order.
* @return {Observable} An Observable of projected results or arrays of recent
* values.
* @method combineAll
* @owner Observable
*/
export declare function combineAll<T, R>(this: Observable<T>, project?: (...values: Array<any>) => R): Observable<R>;