add PORT back, fixes #48

app/server.js

@@ -6,6 +6,8 @@ import serve from 'serve-static';
 import fetch from 'node-fetch';
 import { routes } from './manifest/server.js';
 
+const { PORT } = process.env;
+
 // this allows us to do e.g. `fetch('/api/blog-posts')` on the server
 global.fetch = (url, opts) => {
 	if (url[0] === '/') url = `http://localhost:${PORT}${url}`;
@@ -17,4 +19,4 @@ polka()
 	.use(compression({ threshold: 0 }))
 	.use(serve('assets'))
 	.use(sapper({ routes }))
-	.listen(process.env.PORT);
+	.listen(PORT);