9_types.js

const UserType = new GraphQLObjectType({
  name : 'User',
  fields : {
    username : { type : GraphQLString }
  }
});

const MovieType = new GraphQLObjectType({
  name : 'Movie',
  fields : {
    director : { type : GraphQLString }
  }
});

const BookType = new GraphQLObjectType({
  name : 'Book',
  fields : {
    author : { type : GraphQLString }
  }
});