import { Observable, OperatorFunction } from 'rxjs';
/**
 * Subscribes to any emitted observable, but "cancels" it immediately when another one arrives.
 * _Canceling_ means:
 * * the source observable is immediately unsubscribed from
 * * the re-emitted hot observable is completed or failed (if `cancelError` is specified and different from `undefined`)
 *
 * The observables are re-emitted immediately as *hot*.
 *
 * **Warning:** The source observable is always subscribed to, therefore this concurrency strategy cannot prevent eventual side-effects when cancelling.
 *
 * @param cancelError when provided the re-emitted observable will throw the provided error instead of completing when it is cancelled
 * @typeParam T type of both the accepted and emitted observable
 * @category Operator
 */
export declare function concurrentLatest<T>(cancelError?: any): OperatorFunction<Observable<T>, Observable<T>>;
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