src/language-handlebars/utils.js/getSiblingNode
function getSiblingNode(path, offset) {
  const node = path.getValue();
  const parentNode = path.getParentNode(0) ?? {};
  const children =
    parentNode.children ?? parentNode.body ?? parentNode.parts ?? [];
  const index = children.indexOf(node);
  return index !== -1 && children[index + offset];
}