import { NgZone } from '@angular/core';
import { MonoTypeOperatorFunction } from 'rxjs';
/**
 *
 * @param ngZone
 */
export declare function ngDocZoneAttach<T>(ngZone?: NgZone): MonoTypeOperatorFunction<T>;
/**
 *
 * @param ngZone
 */
export declare function ngDocZoneDetach<T>(ngZone?: NgZone): MonoTypeOperatorFunction<T>;
/**
 *
 * @param ngZone
 */
export declare function ngDocZoneOptimize<T>(ngZone?: NgZone): MonoTypeOperatorFunction<T>;