/**
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE
 */
import { OverlayRef } from '@angular/cdk/overlay';
export declare function overlayZIndexSetter(overlayRef: OverlayRef, zIndex?: number): void;