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import { Subject } from './Subject';
import { Subscriber } from './Subscriber';
import { Subscription } from './Subscription';
/**
* A variant of Subject that only emits a value when it completes. It will emit
* its latest value to all its observers on completion.
*
* @class AsyncSubject<T>
*/
export declare class AsyncSubject<T> extends Subject<T> {
private value;
private hasNext;
private hasCompleted;
/** @deprecated This is an internal implementation detail, do not use. */
_subscribe(subscriber: Subscriber<any>): Subscription;
next(value: T): void;
error(error: any): void;
complete(): void;
}