Getting error when first starting server in the tutorial

Inizia da schema.js e analizza il template literal gql confrontandolo con le definizioni dei tipi mostrate nel tutorial; poi controlla index.js per confermare come viene caricato lo schema. Avvia il server e verifica che il tutorial si avvii senza il SyntaxError segnalato.

I'm sure it's something I'm doing wrong, but I've just started the tutorial and when I first try to start the server I get

type Launch {
^^^^^^

SyntaxError: Unexpected identifier
at new Script (vm.js:74:7)
at createScript (vm.js:246:10)
at Object.runInThisContext (vm.js:298:10)
at Module._compile (internal/modules/cjs/loader.js:657:28)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
at Module.load (internal/modules/cjs/loader.js:599:32)
at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
at Function.Module._load (internal/modules/cjs/loader.js:530:3)
at Module.require (internal/modules/cjs/loader.js:637:17)
at require (internal/modules/cjs/helpers.js:20:18)
[nodemon] app crashed - waiting for file changes before starting...

My schema.js file is

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

const typeDefs = gql``

module.exports = typeDefs;


type Launch {
  id: ID!
    site: String
  mission: Mission
  rocket: Rocket
  isBooked: Boolean!
}

type Rocket {
  id: ID!
    name: String
  type: String
}

type User {
  id: ID!
    email: String!
    trips: [Launch]!
}

type Mission {
  name: String
  missionPatch(size: PatchSize): String
}

enum PatchSize {
  SMALL
  LARGE
}

type Mutation {
  # if false, booking trips failed -- check errors
  bookTrips(launchIds: [ID]!): TripUpdateResponse!

    # if false, cancellation failed -- check errors
  cancelTrip(launchId: ID!): TripUpdateResponse!

    login(email: String): String # login token
}

type Query {
  launches: [Launch]!
    launch(id: ID!): Launch
  # Queries for the current user
  me: User
}

and index.js is

const { ApolloServer } = require('apollo-server');
const typeDefs = require('./schema');

const server = new ApolloServer({ typeDefs });

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

Not sure where the error lies as I was simply copying code from the tutorial....thanks for any clues.