如何在graphql-js中定义对象类型的解析器？

const { GraphQLObjectType, GraphQLString, GraphQLInt } = require('graphql');

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

const { getUserById } = require('./dataSources');

const resolvers = {
  User: {
    name: (parent) => parent.name,
    email: (parent) => parent.email,
    id: (parent) => parent.id,
  },
};

const { GraphQLSchema, GraphQLObjectType } = require('graphql');

const schema = new GraphQLSchema({
  query: new GraphQLObjectType({
    name: 'Query',
    fields: {
      user: {
        type: UserType,
        resolve: () => getUserById(1), // 从数据源中获取用户数据
      },
    },
  }),
});