Remove unused file and fix lint warnings

server/middleware/assetsManifest.js

@@ -1,26 +0,0 @@
-/**
- * An express middleware that sets req.manifest from the build manifest
- * in the given file. Should be used in production together with
- * https://github.com/soundcloud/chunk-manifest-webpack-plugin
- * to get consistent hashes.
- */
-function assetsManifest(webpackManifestFile) {
-  let manifest;
-  try {
-    manifest = JSON.parse(fs.readFileSync(webpackManifestFile, "utf8"));
-  } catch (error) {
-    invariant(
-      false,
-      'assetsManifest middleware cannot read the manifest file "%s"; ' +
-        "run `yarn build` before starting the server",
-      webpackManifestFile
-    );
-  }
-
-  return (req, res, next) => {
-    req.manifest = manifest;
-    next();
-  };
-}
-
-module.exports = assetsManifest;

server/plugins/unpkgRewrite.js

@@ -3,7 +3,7 @@ const warning = require("warning");
 
 const config = require("../config");
 
-const bareIdentifierFormat = /^((?:@[^\/]+\/)?[^\/]+)(\/.*)?$/;
+const bareIdentifierFormat = /^((?:@[^/]+\/)?[^/]+)(\/.*)?$/;
 
 function unpkgRewrite(dependencies = {}) {
   return {