/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { MonoTypeOperatorFunction, ObservableInput } from 'rxjs';
/**
 * Perform a side effect through a switchMap for every emission on the source Observable,
 * but return an Observable that is identical to the source. It's essentially the same as
 * the `tap` operator, but if the side effectful `next` function returns an ObservableInput,
 * it will wait before continuing with the original value.
 */
export declare function switchTap<T>(next: (x: T) => void | ObservableInput<any>): MonoTypeOperatorFunction<T>;
