export declare function getViewportSize(): {
    width: number;
    height: number;
};
export declare function findHighestZIndex(elem: HTMLElement): number;
export declare function safeFocus(element: HTMLElement): void;
export declare const eqCssPrefix = "eqjs";
export declare const eqCssMobile = "eqjs-mobile";
export declare function getMobileCssClass(): string | null;
export declare function makeElementMaximizable(element: HTMLDivElement): void;