import { CSSProperties, RefObject } from 'react';
/**
 * Computes a fixed-position style for a portaled dropdown anchored to a
 * wrapper element. Re-evaluates when the dropdown opens, on scroll, and on
 * resize. Picks the side (above/below) with the most available space.
 */
export declare function useDropdownPosition(wrapperRef: RefObject<HTMLElement | null>, isOpen: boolean, dropdownGap: number): CSSProperties;