Allow to provide port number through env.PORT

Author: IvanGoncharov

src/server/main.js

@@ -24,13 +24,12 @@ app.use(
 );
 
 // Listen for incoming HTTP requests
-const listener = app.listen(() => {
+const listener = app.listen(process.env.PORT || undefined, () => {
   let host = listener.address().address;
   if (host === '::') {
     host = 'localhost';
   }
   const port = listener.address().port;
-  /* eslint-disable no-console */
+  // eslint-disable-next-line no-console
   console.log('Listening at http://%s%s', host, port === 80 ? '' : ':' + port);
-  /* eslint-enable no-console */
 });