Transpiled GraphQL with Babel is throwing error "Cannot call class as function" - express

Question

I am trying to get running GraphQL server. I have simple schema in GraphQL
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
I am transpile it with babel into ES5, but every time when I try run it with express
import GraphHTTP from 'express-graphql'
import Schema from './schema'
app.use('/grapql', GraphHTTP({
schema: Schema,
pretty: true,
graphiql: true
}))
I am getting this error
\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
I check it again and again if i have some typing error but i didnt find enything.

Answer 1

instead of type: GraphQLList(user) use type: new GraphQLList(user)
GraphQLList is a class and you have to create it's instance and use, but you have called it as a function.
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})
}
}
}
}
})