import { MonoTypeOperatorFunction, PartialObserver } from "rxjs";
export declare function tapWithIndex<T>(next?: (tuple: [T, number]) => void, error?: (error: any) => void, complete?: () => void): MonoTypeOperatorFunction<T>;
export declare function tapWithIndex<T>(observer: PartialObserver<[T, number]>): MonoTypeOperatorFunction<T>;