@redocly/theme/src/core/hooks/use-outside-click.ts

Shared UI components lib

import { useEffect } from 'react';

import type { RefObject } from 'react';

export function useOutsideClick(
  ref: RefObject<HTMLElement | null>,
  handler?: (event: MouseEvent | TouchEvent) => void,
): void {
  useEffect(() => {
    const listener = (event: MouseEvent | TouchEvent) => {
      if (!handler || !ref.current || ref.current.contains(event.target as Node)) {
        return;
      }
      handler(event);
    };
    document.addEventListener('mousedown', listener);
    document.addEventListener('touchstart', listener);
    return () => {
      document.removeEventListener('mousedown', listener);
      document.removeEventListener('touchstart', listener);
    };
  }, [ref, handler]);
}