export declare const OVERLAY_TRANSPARENT_CLASS = "qd-overlay--transparent";
export declare const OVERLAY_CLOSING_CLASS = "qd-overlay--closing";
export declare const OVERLAY_DEACTIVATED_CLASS = "qd-overlay--deactivated";
export declare function setOverlayOpenedTime(className: string, openedTime: number): void;
export declare function updateOverlayMasks(parentNode?: ParentNode, excludeClassName?: string): void;
export declare function markPreviousOverlaysTransparent(parentNode: ParentNode, excludeClassName?: string): void;
export declare function focusTopOverlay(parentNode?: ParentNode): void;
export declare function registerOverlayEsc(className: string, entry: {
    close: () => void;
    closeOnEscKeydown?: boolean;
}): void;
export declare function unregisterOverlayEsc(className: string): void;
export declare function setOverlayActive(className: string, active: boolean): void;
export declare function setOverlayEscEnabled(className: string, enabled: boolean): void;