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import { operate } from '../util/lift';
import { innerFrom } from '../observable/innerFrom';
import { createOperatorSubscriber } from './OperatorSubscriber';
export function audit(durationSelector) {
    return operate((source, subscriber) => {
        let hasValue = false;
        let lastValue = null;
        let durationSubscriber = null;
        let isComplete = false;
        const endDuration = () => {
            durationSubscriber === null || durationSubscriber === void 0 ? void 0 : durationSubscriber.unsubscribe();
            durationSubscriber = null;
            if (hasValue) {
                hasValue = false;
                const value = lastValue;
                lastValue = null;
                subscriber.next(value);
            }
            isComplete && subscriber.complete();
        };
        const cleanupDuration = () => {
            durationSubscriber = null;
            isComplete && subscriber.complete();
        };
        source.subscribe(createOperatorSubscriber(subscriber, (value) => {
            hasValue = true;
            lastValue = value;
            if (!durationSubscriber) {
                innerFrom(durationSelector(value)).subscribe((durationSubscriber = createOperatorSubscriber(subscriber, endDuration, cleanupDuration)));
            }
        }, () => {
            isComplete = true;
            (!hasValue || !durationSubscriber || durationSubscriber.closed) && subscriber.complete();
        }));
    });
}
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