使用 Babel 编译的 GraphQL 抛出错误“无法将类作为函数调用”

Question

我正在尝试运行 GraphQL 服务器。我在 GraphQL 中有简单的模式

import {
  GraphQLObjectType,
  GraphQLInt,
  GraphQLString,
  GraphQLList,
  GraphQLSchema
} from 'graphql'
import db from './models'

const user = new GraphQLObjectType({
  name: "user",
  description: 'This represents a user',
  fields: () => {
    return {
        id: {
            type: GraphQLInt,
            resolve(user) {
                return user.id
            }
        },
        firstName: {
            type: GraphQLString,
            resole(user) {
                return user.firstName
            }
        },
        lastName: {
            type: GraphQLString,
            resole(user) {
                return user.lastName
            }
        },
        email: {
            type: GraphQLString,
            resole(user) {
                return user.email
            }
        },
        createdAt: {
            type: GraphQLString,
            resole(user) {
                return user.createdAt
            }
        },
        updatedAt: {
            type: GraphQLString,
            resole(user) => {
                return user.updatedAt
            }
        }
      }
     }
 })


 const Query = new GraphQLObjectType({
   name: 'Query',
   description: 'This is root Query',
   fields: () => {
      return {
        users: {
            type: GraphQLList(user),
            args: {
                id: {
                    type: GraphQLInt
                },
                email: {
                    type: GraphQLString
                }
            },
            resolve(root, args) {
                return db.user.findAll({where: args})
            }
          }
       }
    }
 })

 const Schema = new GraphQLSchema({
  query: Query
 })

 export default Schema

我用 babel 把它转译成 ES5，但是每次当我尝试用 express 运行它时

import GraphHTTP from 'express-graphql'
import Schema from './schema'

app.use('/grapql', GraphHTTP({
  schema: Schema,
  pretty: true,
  graphiql: true
}))

我收到此错误

 \node_modules\graphql\type\definition.js:41
 function _classCallCheck(instance, Constructor) { if (!instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }                                                             
TypeError: Cannot call a class as a function

如果我有一些打字错误，我会一遍又一遍地检查它，但我没有找到任何东西。

Answer 1

而不是type: GraphQLList(user)使用type: new GraphQLList(user)

GraphQLList是 aclass并且您必须创建它的实例并使用它，但是您已将其作为函数调用。

 const Query = new GraphQLObjectType({
   name: 'Query',
   description: 'This is root Query',
   fields: () => {
      return {
        users: {
            type: new GraphQLList(user),   
            args: {
                id: {
                    type: GraphQLInt
                },
                email: {
                    type: GraphQLString
                }
            },
            resolve(root, args) {
                return db.user.findAll({where: args})
            }
          }
       }
    }
 })