use polka again

app/server.js

@@ -1,21 +1,20 @@
 import { resolve } from 'url';
-import express from 'express';
+import polka from 'polka';
 import compression from 'compression';
 import sapper from 'sapper';
 import serve from 'serve-static';
 import fetch from 'node-fetch';
-import { basepath, routes } from './manifest/server.js';
+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) => {
-	url = resolve(`http://localhost:${PORT}${basepath}/`, url);
+	url = resolve(`http://localhost:${PORT}/`, url);
 	return fetch(url, opts);
 };
 
-express()
+polka()
 	.use(compression({ threshold: 0 }))
-	.use(basepath, serve('assets'))
-	.use(sapper({ routes }))
+	.use(serve('assets'), sapper({ routes }))
 	.listen(PORT);

package.json

@@ -14,7 +14,6 @@
   "dependencies": {
     "compression": "^1.7.1",
     "cross-env": "^5.1.3",
-    "express": "^4.16.3",
     "node-fetch": "^2.0.0",
     "npm-run-all": "^4.1.2",
     "polka": "^0.3.4",