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- import { OperatorFunction } from '../types';
- /**
- * Emits a given value if the source Observable completes without emitting any
- * `next` value, otherwise mirrors the source Observable.
- *
- * <span class="informal">If the source Observable turns out to be empty, then
- * this operator will emit a default value.</span>
- *
- * 
- *
- * `defaultIfEmpty` emits the values emitted by the source Observable or a
- * specified default value if the source Observable is empty (completes without
- * having emitted any `next` value).
- *
- * ## Example
- *
- * If no clicks happen in 5 seconds, then emit 'no clicks'
- *
- * ```ts
- * import { fromEvent, takeUntil, interval, defaultIfEmpty } from 'rxjs';
- *
- * const clicks = fromEvent(document, 'click');
- * const clicksBeforeFive = clicks.pipe(takeUntil(interval(5000)));
- * const result = clicksBeforeFive.pipe(defaultIfEmpty('no clicks'));
- * result.subscribe(x => console.log(x));
- * ```
- *
- * @see {@link empty}
- * @see {@link last}
- *
- * @param defaultValue The default value used if the source
- * Observable is empty.
- * @return A function that returns an Observable that emits either the
- * specified `defaultValue` if the source Observable emits no items, or the
- * values emitted by the source Observable.
- */
- export declare function defaultIfEmpty<T, R>(defaultValue: R): OperatorFunction<T, T | R>;
- //# sourceMappingURL=defaultIfEmpty.d.ts.map
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