create-farcaster-mini-app/src/hooks/useDetectClickOutside.ts

import { useEffect } from 'react';

export function useDetectClickOutside<T extends HTMLElement>(
  ref: React.RefObject<T | null>,
  callback: () => void
) {
  useEffect(() => {
    function handleClickOutside(event: MouseEvent) {
      if (ref.current && !ref.current.contains(event.target as Node)) {
        callback();
      }
    }
    document.addEventListener('mousedown', handleClickOutside);
    return () => {
      document.removeEventListener('mousedown', handleClickOutside);
    };
  }, [ref, callback]);
}