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import { Observable } from '../Observable';
import { MonoTypeOperatorFunction } from '../types';
/**
* Returns an Observable that mirrors the source Observable with the exception of an `error`. If the source Observable
* calls `error`, this method will emit the Throwable that caused the error to the Observable returned from `notifier`.
* If that Observable calls `complete` or `error` then this method will call `complete` or `error` on the child
* subscription. Otherwise this method will resubscribe to the source Observable.
*
* ![](retryWhen.png)
* Retry an observable sequence on error based on custom criteria.
* ## Example
* ```ts
* import { timer, interval } from 'rxjs';
* import { map, tap, retryWhen, delayWhen } from 'rxjs/operators';
* const source = interval(1000);
* const example = source.pipe(
* map(val => {
* if (val > 5) {
* // error will be picked up by retryWhen
* throw val;
* }
* return val;
* }),
* retryWhen(errors =>
* errors.pipe(
* // log error message
* tap(val => console.log(`Value ${val} was too high!`)),
* // restart in 5 seconds
* delayWhen(val => timer(val * 1000))
* )
* );
* const subscribe = example.subscribe(val => console.log(val));
* // results:
* // 0
* // 1
* // 2
* // 3
* // 4
* // 5
* // "Value 6 was too high!"
* // --Wait 5 seconds then repeat
* ```
* @param {function(errors: Observable): Observable} notifier - Receives an Observable of notifications with which a
* user can `complete` or `error`, aborting the retry.
* @return A function that returns an Observable that mirrors the source
* Observable with the exception of an `error`.
*/
export declare function retryWhen<T>(notifier: (errors: Observable<any>) => Observable<any>): MonoTypeOperatorFunction<T>;
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