export default (el: HTMLElement, { partially = false } = {}): boolean => {
  const { top, left, bottom, right } = el.getBoundingClientRect();
  const { innerHeight, innerWidth } = window;

  if (partially) {
    return ((top > 0 && top < innerHeight) || (bottom > 0 && bottom < innerHeight))
      && ((left > 0 && left < innerWidth) || (right > 0 && right < innerWidth));
  }

  return top >= 0 && left >= 0 && bottom <= innerHeight && right <= innerWidth;
};