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- import { Observable } from '../Observable';
- /**
- * Returns an Observable that emits the single item emitted by the source Observable that matches a specified
- * predicate, if that Observable emits one such item. If the source Observable emits more than one such item or no
- * such items, notify of an IllegalArgumentException or NoSuchElementException respectively.
- *
- * <img src="./img/single.png" width="100%">
- *
- * @throws {EmptyError} Delivers an EmptyError to the Observer's `error`
- * callback if the Observable completes before any `next` notification was sent.
- * @param {Function} predicate - A predicate function to evaluate items emitted by the source Observable.
- * @return {Observable<T>} An Observable that emits the single item emitted by the source Observable that matches
- * the predicate.
- .
- * @method single
- * @owner Observable
- */
- export declare function single<T>(this: Observable<T>, predicate?: (value: T, index: number, source: Observable<T>) => boolean): Observable<T>;
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