Type Alias: DocumentNode

type DocumentNode = 
  | RootNode
  | PageNode
  | HeadingNode
  | TextNode
  | BoxNode
  | VStackNode
  | HStackNode
  | GridNode
  | GridCellNode
  | TableNode
  | TableRowNode
  | TableCellNode
  | ListNode
  | ListItemNode
  | ImageNode
  | DividerNode;