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import { mergeAll } from './mergeAll';
import { OperatorFunction, ObservableInput } from '../types';
export function concatAll<T>(): OperatorFunction<ObservableInput<T>, T>;
export function concatAll<R>(): OperatorFunction<any, R>;
/**
* Converts a higher-order Observable into a first-order Observable by
* concatenating the inner Observables in order.
*
* <span class="informal">Flattens an Observable-of-Observables by putting one
* inner Observable after the other.</span>
*
* 
*
* Joins every Observable emitted by the source (a higher-order Observable), in
* a serial fashion. It subscribes to each inner Observable only after the
* previous inner Observable has completed, and merges all of their values into
* the returned observable.
*
* __Warning:__ If the source Observable emits Observables quickly and
* endlessly, and the inner Observables it emits generally complete slower than
* the source emits, you can run into memory issues as the incoming Observables
* collect in an unbounded buffer.
*
* Note: `concatAll` is equivalent to `mergeAll` with concurrency parameter set
* to `1`.
*
* ## Example
*
* For each click event, tick every second from 0 to 3, with no concurrency
* ```javascript
* const clicks = fromEvent(document, 'click');
* const higherOrder = clicks.pipe(
* map(ev => interval(1000).pipe(take(4))),
* );
* const firstOrder = higherOrder.pipe(concatAll());
* firstOrder.subscribe(x => console.log(x));
*
* // Results in the following:
* // (results are not concurrent)
* // For every click on the "document" it will emit values 0 to 3 spaced
* // on a 1000ms interval
* // one click = 1000ms-> 0 -1000ms-> 1 -1000ms-> 2 -1000ms-> 3
* ```
*
* @see {@link combineAll}
* @see {@link concat}
* @see {@link concatMap}
* @see {@link concatMapTo}
* @see {@link exhaust}
* @see {@link mergeAll}
* @see {@link switchAll}
* @see {@link switchMap}
* @see {@link zipAll}
*
* @return {Observable} An Observable emitting values from all the inner
* Observables concatenated.
* @method concatAll
* @owner Observable
*/
export function concatAll<T>(): OperatorFunction<ObservableInput<T>, T> {
return mergeAll<T>(1);
}
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