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import { Subject } from './Subject'; import { Subscriber } from './Subscriber'; /** * 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 class AsyncSubject<T> extends Subject<T> { private _value: T | null = null; private _hasValue = false; private _isComplete = false; /** @internal */ protected _checkFinalizedStatuses(subscriber: Subscriber<T>) { const { hasError, _hasValue, _value, thrownError, isStopped, _isComplete } = this; if (hasError) { subscriber.error(thrownError); } else if (isStopped || _isComplete) { _hasValue && subscriber.next(_value!); subscriber.complete(); } } next(value: T): void { if (!this.isStopped) { this._value = value; this._hasValue = true; } } complete(): void { const { _hasValue, _value, _isComplete } = this; if (!_isComplete) { this._isComplete = true; _hasValue && super.next(_value!); super.complete(); } } }