export default function useViewportShadows({ containerRef, }: {
    containerRef: React.RefObject<HTMLUListElement>;
}): {
    tabContainerShadows: {
        showLeftShadow: boolean;
        showRightShadow: boolean;
    };
    tabsLastItemRef: import("react").MutableRefObject<HTMLLIElement | null>;
    tabsFirstItemRef: import("react").MutableRefObject<HTMLLIElement | null>;
};
