如何获取GraphQL模式指令中的字段类型(Node.js，graphql-tools)

npm install graphql-tools

const { makeExecutableSchema } = require('graphql-tools');
const { parse } = require('graphql');

const typeDefs = `
  type Query {
    user(id: ID!): User @cacheControl(maxAge: 3600)
  }

  type User {
    id: ID!
    name: String!
    email: String!
  }
`;

const schema = makeExecutableSchema({
  typeDefs: parse(typeDefs),
});

const field = schema.getTypeMap().Query.getFields().user;
const fieldType = field.type.toString();

console.log(fieldType);