這個是我在第一份工作時學到的，非常方便，尤其是在dropdown、popup、modal等常常使用，可以讓你點擊空白區域關閉，會回傳一個ref讓你可以放在component上

import { useEffect, useRef } from "react";

const useOutsideClick = (callback: () => void) => {
  const ref = useRef<HTMLElement | null>(null);

  useEffect(() => {
    const handleClick = (event: MouseEvent) => {
      if (ref.current && !ref.current.contains(event.target as Node)) {
        callback();
      }
    };

    document.addEventListener("click", handleClick);

    return () => {
      document.removeEventListener("click", handleClick);
    };
  }, [callback]); // updated dependency array to include callback instead of ref

  return ref;
};

export default useOutsideClick;