Function siblingAfter

packages/core/src/hydration/node_lookup_utils.ts:184–201

(skip: number, from: RNode)

 * Skips over a specified number of nodes and returns the next sibling node after that.
 */
export function siblingAfter<T extends RNode>(skip: number, from: RNode): T | null {
  let currentNode = from;
  for (let i = 0; i < skip; i++) {
    ngDevMode && validateSiblingNodeExists(currentNode);
    // `validateSiblingNodeExists` above would normally catch a missing sibling too, but it's
    // dev-mode only. Guard against it here so production throws a coded RuntimeError instead
    // of a raw TypeError when dereferencing `currentNode` below.
    if (currentNode == null) {
      throw new RuntimeError(
        RuntimeErrorCode.HYDRATION_MISSING_SIBLINGS,
        ngDevMode &&
          'During hydration Angular expected more sibling nodes to be present. This usually means the client-rendered DOM no longer matches the server-rendered HTML.',
      );
    }
    currentNode = currentNode.nextSibling!;
  }
  return currentNode as T;
}

/**
 * Helper function to produce a string representation of the navigation steps