src/language-graphql/parser-graphql.js/removeTokens
function removeTokens(node) {
  if (node && typeof node === "object") {
    delete node.startToken;
    delete node.endToken;
    delete node.prev;
    delete node.next;
    for (const key in node) {
      removeTokens(node[key]);
    }
  }
  return node;
}