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node_modules/rxjs/operators/single.d.ts

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+import { Observable } from '../Observable';
+import { MonoTypeOperatorFunction } from '../interfaces';
+/**
+ * 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>(predicate?: (value: T, index: number, source: Observable<T>) => boolean): MonoTypeOperatorFunction<T>;