/**
 * @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 { Observable } from 'rxjs';
/**
 *
 * @param stream - Rx Stream
 * @param period - The period of time between emissions of the subsequent numbers.
 * @param initialDelay - The initial delay time to wait before emitting the first value of 0.
 */
export declare function polling(stream: Observable<any>, period: number, initialDelay?: number): Observable<any>;