Function isDisconnectedNode

packages/core/src/hydration/node_lookup_utils.ts:55–61

(tNode: TNode, lView: LView)

 * Check whether a given node exists, but is disconnected from the DOM.
 */
export function isDisconnectedNode(tNode: TNode, lView: LView) {
  return (
    !(tNode.type & (TNodeType.Projection | TNodeType.LetDeclaration)) &&
    !!lView[tNode.index] &&
    isDisconnectedRNode(unwrapRNode(lView[tNode.index]))
  );
}

/**
 * Check whether the given node exists, but is disconnected from the DOM.