text: const { gql } = require('apollo-server');
  
  const rootTypes = gql`
    extend type Query {
      user(id: ID, username: String, email: String): User!
      users: [User]!
    }
  `;
  
  const customTypes = gql`
    type User {
      id: ID!
      name: String!
      username: String!
      email: String!
      posts: [Post!]!
      createdAt: String
      updatedAt: String
    }
  `;
  
  exports.typeDefs = [rootTypes, customTypes];
  