Function isScrollable

packages/react-aria/src/utils/isScrollable.ts:13–31

(node: Element | null, checkForOverflow?: boolean)

 */

export function isScrollable(node: Element | null, checkForOverflow?: boolean): boolean {
  if (!node) {
    return false;
  }
  let style = window.getComputedStyle(node);
  let root = document.scrollingElement || document.documentElement;
  let isScrollable = /(auto|scroll)/.test(style.overflow + style.overflowX + style.overflowY);

  // Root element has `visible` overflow by default, but is scrollable nonetheless.
  if (node === root && style.overflow !== 'hidden') {
    isScrollable = true;
  }

  if (isScrollable && checkForOverflow) {
    isScrollable = node.scrollHeight !== node.clientHeight || node.scrollWidth !== node.clientWidth;
  }

  return isScrollable;
}