/**
 * @license
 * Copyright Datorama. All Rights Reserved.
 *
 * Use of this source code is governed by an Apache License 2.0 license that can be
 * found in the LICENSE file at https://github.com/datorama/client-core/blob/master/LICENSE
 */
import { MonoTypeOperatorFunction, Observable } from 'rxjs';
export declare const tapLog: (tag: string) => MonoTypeOperatorFunction<any>;
export declare function tapOnce<T>(cb: (v: T) => any): (source: Observable<T>) => Observable<T>;