Main Service with Apollo Engine

main-service-engine.ts

import { ApolloEngine } from 'apollo-engine';

const app = express();

app.use(
  '/graphql',
  bodyParser.json(),
  graphqlExpress(async (req, res) => {
    ...
    const schema; // created previously

    return {
      schema: schema,
      graphiql: true,
      tracing: true,
      cacheControl: {
        defaultMaxAge: 3500
      },
      context: { req, res }
    };
  })
);

app.use('/graphiql', graphiqlExpress({ endpointURL: '/graphql' }));

const engine = new ApolloEngine({
  apiKey: 'service:microservices-example:-kee_qJAX8UKDLPjI7JVjw'
});

engine.listen({
  port: 4000,
  expressApp: app
});