dotenv usage

src/server/server-dev.ts

@@ -14,6 +14,6 @@ app.use(webpackHotMiddleware(compiler));
 
 server.applyMiddleware({ app });
 
-app.listen(8080, () => {
+app.listen(process.env.PORT || 3000, () => {
     console.log('Server started');
 });

src/server/server.ts

@@ -7,6 +7,6 @@ server.applyMiddleware({ app });
 
 app.use(express.static('dist/web'));
 
-app.listen(8080, () => {
+app.listen(process.env.PORT || 3000, () => {
     console.log('Server started');
 });