get first parent scrollable container of a DOM element

get-scroll-parent.js

// more minimal version of https://github.com/olahol/scrollparent.js/blob/master/scrollparent.js
const regex = /(auto|scroll)/;

const isScrollable = element => {
  let result = false; 

  if (element) {
    const styles = getComputedStyle(element);
    result = regex.test(styles.overflow + styles.overflowX + styles.overflowY);
  }

  return result;
}

const getScrollParent = element => !element || element === document.body
  ? document.body
  : isScrollable(element.parentElement)
    ? element.parentElement
    : getScrollParent(element.parentElement);

export { getScrollParent };