import { type RefObject } from 'react';
/**
 * Hook that detects clicks outside an element
 *
 * @template T - The type of the HTML element
 * @param handler - Function to call when click is outside
 * @returns Ref object to attach to the element
 *
 * @example
 * ```tsx
 * const Dropdown = () => {
 *   const [isOpen, setIsOpen] = useState(false);
 *   const ref = useClickOutside(() => setIsOpen(false));
 *   return (
 *     <div ref={ref}>
 *       <button onClick={() => setIsOpen(true)}>Open</button>
 *       {isOpen && <div>Dropdown Content</div>}
 *     </div>
 *   );
 * };
 * ```
 */
export declare function useClickOutside<T extends HTMLElement = HTMLElement>(handler: () => void): RefObject<T>;
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