Function last

packages/react-aria/src/focus/FocusScope.tsx:998–1008

(walker: ShadowTreeWalker | TreeWalker)

}

function last(walker: ShadowTreeWalker | TreeWalker) {
  let next: FocusableElement | undefined = undefined;
  let last: FocusableElement;
  do {
    last = walker.lastChild() as FocusableElement;
    if (last) {
      next = last;
    }
  } while (last);
  return next;
}

class Tree {
  root: TreeNode;