import { ElementRef, RendererFactory2 } from '@angular/core';
import * as i0 from "@angular/core";
/**
 * @internal
 */
export declare class SkyOverlayAdapterService {
    #private;
    constructor(rendererFactory: RendererFactory2);
    restrictBodyScroll(): void;
    releaseBodyScroll(): void;
    addAriaHiddenToSiblings(overlayElementRef: ElementRef): Map<Element, string | null>;
    restoreAriaHiddenForSiblings(siblingAriaHiddenCache: Map<Element, string | null>): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<SkyOverlayAdapterService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<SkyOverlayAdapterService>;
}