Getting error when first starting server in the tutorial

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.

Commencez par schema.js et examinez le littéral de modèle gql en le comparant aux définitions de types présentées dans le tutoriel ; vérifiez ensuite index.js pour confirmer comment le schéma est chargé. Lancez le serveur et vérifiez que le tutoriel démarre sans le SyntaxError signalé.

Rédigé par le modèle d'indexation à partir du texte de l'issue.