import { EventEmitter, NgZone } from "@angular/core";
import * as i0 from "@angular/core";
export declare class MdlBackdropOverlayComponent {
    private ngZone;
    zIndex: number;
    isBackdrop: boolean;
    clickEmitter: EventEmitter<void>;
    private visible;
    constructor(ngZone: NgZone);
    get display(): string | null;
    onBackdropClick(e: Event): void;
    hide(): void;
    showWithZIndex(zIndex: number): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<MdlBackdropOverlayComponent, never>;
    static ɵcmp: i0.ɵɵComponentDeclaration<MdlBackdropOverlayComponent, "mdl-backdrop-overlay", never, {}, {}, never, never, false, never>;
}