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import { operate } from '../util/lift';
import { noop } from '../util/noop';
import { createOperatorSubscriber } from './OperatorSubscriber';
import { innerFrom } from '../observable/innerFrom';
export function debounce(durationSelector) {
return operate((source, subscriber) => {
let hasValue = false;
let lastValue = null;
let durationSubscriber = null;
const emit = () => {
durationSubscriber === null || durationSubscriber === void 0 ? void 0 : durationSubscriber.unsubscribe();
durationSubscriber = null;
if (hasValue) {
hasValue = false;
const value = lastValue;
lastValue = null;
subscriber.next(value);
}
};
source.subscribe(createOperatorSubscriber(subscriber, (value) => {
durationSubscriber === null || durationSubscriber === void 0 ? void 0 : durationSubscriber.unsubscribe();
hasValue = true;
lastValue = value;
durationSubscriber = createOperatorSubscriber(subscriber, emit, noop);
innerFrom(durationSelector(value)).subscribe(durationSubscriber);
}, () => {
emit();
subscriber.complete();
}, undefined, () => {
lastValue = durationSubscriber = null;
}));
});
}
//# sourceMappingURL=debounce.js.map
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