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import { OperatorFunction, ObservableInput, ObservedValueOf } from '../types';
/**
* 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
* ```ts
* import { fromEvent, map, interval, take, concatAll } from 'rxjs';
* const clicks = fromEvent(document, 'click');
* const higherOrder = clicks.pipe(
* map(() => 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 combineLatestAll}
* @see {@link concat}
* @see {@link concatMap}
* @see {@link concatMapTo}
* @see {@link exhaustAll}
* @see {@link mergeAll}
* @see {@link switchAll}
* @see {@link switchMap}
* @see {@link zipAll}
* @return A function that returns an Observable emitting values from all the
* inner Observables concatenated.
*/
export declare function concatAll<O extends ObservableInput<any>>(): OperatorFunction<O, ObservedValueOf<O>>;
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