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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 scan<T>(this: Observable<T>, accumulator: (acc: T, value: T, index: number) => T, seed?: T): Observable<T>; export declare function scan<T>(this: Observable<T>, accumulator: (acc: T[], value: T, index: number) => T[], seed?: T[]): Observable<T[]>; export declare function scan<T, R>(this: Observable<T>, accumulator: (acc: R, value: T, index: number) => R, seed?: R): Observable<R>;