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  1. import { PartialObserver } from '../Observer';
  2. import { MonoTypeOperatorFunction } from '../interfaces';
  3. export declare function tap<T>(next: (x: T) => void, error?: (e: any) => void, complete?: () => void): MonoTypeOperatorFunction<T>;
  4. export declare function tap<T>(observer: PartialObserver<T>): MonoTypeOperatorFunction<T>;