export function getViewportCoordinates(): {
    top: number;
    right: any;
    bottom: any;
    left: number;
} | {
    top?: undefined;
    right?: undefined;
    bottom?: undefined;
    left?: undefined;
};
export function getViewportSize(): {
    width: any;
    height: any;
} | {
    width?: undefined;
    height?: undefined;
};