import { Subject } from './Subject';
/**
 * A variant of Subject that only emits a value when it completes. It will emit
 * its latest value to all its observers on completion.
 */
export declare class AsyncSubject<T> extends Subject<T> {
    private _value;
    private _hasValue;
    private _isComplete;
    next(value: T): void;
    complete(): void;
}
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