Function getNativeByTNodeOrNull

packages/core/src/render3/util/view_utils.ts:116–124

(tNode: TNode | null, lView: LView)

 * @param lView
 */
export function getNativeByTNodeOrNull(tNode: TNode | null, lView: LView): RNode | null {
  const index = tNode === null ? -1 : tNode.index;
  if (index !== -1) {
    ngDevMode && assertTNodeForLView(tNode!, lView);
    const node: RNode | null = unwrapRNode(lView[index]);
    return node;
  }
  return null;
}

// fixme(misko): The return Type should be `TNode|null`
export function getTNode(tView: TView, index: number): TNode {