def height(root):
    queue = deque([root])
    height = -1

    while queue:
        level_len = len(queue)
        height += 1

        for _ in range(level_len):
            current = queue.popleft()
            if current.left:
                queue.append(current.left)
            if current.right:
                queue.append(current.right)
    
    return height

def height(root):
    left_h, right_h = 0, 0
    if root.left:
        left_h = 1 + height(root.left)
    if root.right:
        right_h = 1 + height(root.right)
    return max(left_h, right_h)

node:internal/streams/writable:474

      throw new ERR_INVALID_ARG_TYPE(

      ^

TypeError [ERR_INVALID_ARG_TYPE]: The "chunk" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received undefined