made apollo engine optional

Author: ulfgebhardt

src/index.js

@@ -24,12 +24,14 @@ const schema = makeExecutableSchema({
   resolvers,
 });
 
-const engine = new Engine({
-  engineConfig: { apiKey: process.env.ENGINE_API_KEY },
-  graphqlPort: constants.PORT,
-});
-engine.start();
-app.use(engine.expressMiddleware());
+if (process.env.ENGINE_API_KEY) {
+  const engine = new Engine({
+    engineConfig: { apiKey: process.env.ENGINE_API_KEY },
+    graphqlPort: constants.PORT,
+  });
+  engine.start();
+  app.use(engine.expressMiddleware());
+}
 
 app.use(bodyParser.json());