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rxjs

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Reactive Extensions for modern JavaScript

github.com/ReactiveX/RxJS

ReactiveX/RxJS

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import { Observable } from '../Observable'; export declare function first<T, S extends T>(this: Observable<T>, predicate: (value: T, index: number, source: Observable<T>) => value is S): Observable<S>; export declare function first<T, S extends T, R>(this: Observable<T>, predicate: (value: T | S, index: number, source: Observable<T>) => value is S, resultSelector: (value: S, index: number) => R, defaultValue?: R): Observable<R>; export declare function first<T, S extends T>(this: Observable<T>, predicate: (value: T, index: number, source: Observable<T>) => value is S, resultSelector: void, defaultValue?: S): Observable<S>; export declare function first<T>(this: Observable<T>, predicate?: (value: T, index: number, source: Observable<T>) => boolean): Observable<T>; export declare function first<T, R>(this: Observable<T>, predicate: (value: T, index: number, source: Observable<T>) => boolean, resultSelector?: (value: T, index: number) => R, defaultValue?: R): Observable<R>; export declare function first<T>(this: Observable<T>, predicate: (value: T, index: number, source: Observable<T>) => boolean, resultSelector: void, defaultValue?: T): Observable<T>;