Function isTNodeShape

packages/core/src/render3/interfaces/node.ts:120–128

(value: unknown)

 * within `TView.data`.
 */
export function isTNodeShape(value: unknown): value is TNode {
  return (
    value != null &&
    typeof value === 'object' &&
    ((value as TNode).insertBeforeIndex === null ||
      typeof (value as TNode).insertBeforeIndex === 'number' ||
      Array.isArray((value as TNode).insertBeforeIndex))
  );
}

export function isLetDeclaration(tNode: TNode): boolean {
  return !!(tNode.type & TNodeType.LetDeclaration);