medium-apollo-server-app.js

app.js

const { ApolloServer } = require('apollo-server');

const typeDefs = require('./schema');
const resolvers = require('./resolver');

const server = new ApolloServer({
  typeDefs,
  resolvers
});

server.listen().then(({ url }) => {
  console.log(`🚀 Server ready at ${url}`);
});

resolvers.js

module.exports = {
  Query: {
    user: () => "John Doe"
  }
}

typedef.js

const { gql } = require('apollo-server');

const typeDefs = gql`
  type Query {
    user: String
  } 
`
module.exports = typeDefs;

wrong-resolver-var-name-app.js

const { ApolloServer } = require('apollo-server');

const typeDefs = require('./schema');
const resolver = require('./resolver');

const server = new ApolloServer({
  typeDefs,
  resolver
});

server.listen().then(({ url }) => {
  console.log(`🚀 Server ready at ${url}`);
});

wrong-typedef-var-name-app.js

const { ApolloServer } = require('apollo-server');

const schema = require('./schema');
const resolvers = require('./resolver');

const server = new ApolloServer({
  schema,
  resolvers
});

server.listen().then(({ url }) => {
  console.log(`🚀 Server ready at ${url}`);
});