import * as React from 'react';
import { useEffect, RefObject } from 'react';
// Hook
export function useOnClickInside<T extends HTMLElement>(
  ref: RefObject<T>,
  handler: (event: MouseEvent | TouchEvent) => void
): void {
  useEffect(
    () => {
      const listener = (event: MouseEvent | TouchEvent) => {
        // Do nothing if clicking ref's element or descendent elements
        if (!ref.current || ref.current.contains(event.target as Node)) {
          handler(event);
        }
      };
      document.addEventListener('mousedown', listener);
      document.addEventListener('touchstart', listener);
      return () => {
        document.removeEventListener('mousedown', listener);
        document.removeEventListener('touchstart', listener);
      };
    },
    // Add ref and handler to effect dependencies
    // It's worth noting that because passed in handler is a new ...
    // ... function on every render that will cause this effect ...
    // ... callback/cleanup to run every render. It's not a big deal ...
    // ... but to optimize you can wrap handler in useCallback before ...
    // ... passing it into this hook.
    [ref, handler]
  );
}