When trying to place Apollo graphql schema / typedefs in separate JavaScript module usually end up with the following error ?

Apollo Server requires either an existing schema, modules or typeDefs..

The structure of the project

Project
-schema
--typeDefs.js
--resolvers.js
-index.js
-package.json
// Here is the problamtic code
const express = require('express');
const { ApolloServer, gql } = require('apollo-server-express');
const { importSchema } = require("graphql-import")
const {typeDefs} = require("./schema/TypeDefs") // as a javascript module exported
const resolvers= require("./schema/Resolvers")
​
const server = new ApolloServer({
typeDefs, resolvers,
 plugins: [
     ApolloServerPluginLandingPageGraphQLPlayground({
         // options
     })
     , ApolloServerPluginLandingPageDisabled()
 ]
});
​
const app = express();
server.start().then(r => {
server.applyMiddleware({ app });
 app.listen({ port: 3000 }, () =>
     console.log('Now browse to http://localhost:4000' + server.graphqlPath)
 )
})

Solution

A quick solution for this issue is to place schema in .graphsql file and use graphql-import to import the typeDefs. We need not to export module , just the plain schema as follows.

 # ./schema/typeDefs.graphql
   
   type User{
        name:String!,
        role:String!,
        id:Int
   }
​
   type Query{
       getAll: [User!]!
   }
​
   type Mutation{
       newUser(name :String!,role:String ,id:Int):User
   }

graphql-import

Install the import module using * npm i -s graphql-import* and use ImportSchema in our index.js file as

const { importSchema } = require("graphql-import")
// const {typeDefs} = require("./schema/TypeDefs")
const resolvers= require("./schema/Resolvers")
const typeDefs = importSchema('./schema/Typedefs.graphql')
....
​

I hope this will help you.

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