import { ComponentRef, Type, ViewContainerRef } from "@angular/core";
import * as i0 from "@angular/core";
export declare class OverlayService {
    private overlayRoot?;
    private activeOverlays;
    private isNavigationFrozen;
    constructor();
    private getOverlayRoot;
    createWithoutAppend<T>(component: Type<T>, viewContainer: ViewContainerRef): ComponentRef<T>;
    create<T>(component: Type<T>, viewContainer: ViewContainerRef): ComponentRef<T>;
    addToOverlay<T>(componentRef: ComponentRef<T>): void;
    destroy(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<OverlayService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<OverlayService>;
}