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import { Observable } from '../Observable'; import { MonoTypeOperatorFunction } from '../types'; /** * Emits the most recently emitted value from the source Observable whenever * another Observable, the `notifier`, emits. * * <span class="informal">It's like {@link sampleTime}, but samples whenever * the `notifier` Observable emits something.</span> * *  * * Whenever the `notifier` Observable emits a value or completes, `sample` * looks at the source Observable and emits whichever value it has most recently * emitted since the previous sampling, unless the source has not emitted * anything since the previous sampling. The `notifier` is subscribed to as soon * as the output Observable is subscribed. * * ## Example * On every click, sample the most recent "seconds" timer * ```ts * import { fromEvent, interval } from 'rxjs'; * import { sample } from 'rxjs/operators'; * * const seconds = interval(1000); * const clicks = fromEvent(document, 'click'); * const result = seconds.pipe(sample(clicks)); * result.subscribe(x => console.log(x)); * ``` * * @see {@link audit} * @see {@link debounce} * @see {@link sampleTime} * @see {@link throttle} * * @param {Observable<any>} notifier The Observable to use for sampling the * source Observable. * @return {Observable<T>} An Observable that emits the results of sampling the * values emitted by the source Observable whenever the notifier Observable * emits value or completes. * @method sample * @owner Observable */ export declare function sample<T>(notifier: Observable<any>): MonoTypeOperatorFunction<T>;