Introduce ESLint and Prettier

lib/fs.js

@@ -28,7 +28,7 @@ function listener(request, response) {
   if (request.method === "GET") {
     const filename = querystring.unescape(urlParts.pathname.substring(1));
     const gs = new mongodb.GridStore(db.mongoDb, filename, "r", {});
-    gs.open((err, gs) => {
+    gs.open(err => {
       if (err) {
         response.writeHead(404);
         response.end();
@@ -42,9 +42,7 @@ function listener(request, response) {
       stream.pipe(response);
     });
   } else {
-    response.writeHead(405, {
-      "Allow": "GET"
-    });
+    response.writeHead(405, { Allow: "GET" });
     response.end("405 Method Not Allowed");
   }
 }