refactor(jade-helpers): Clean up code

server/middlewares/jade-helpers.js

@@ -35,18 +35,25 @@ const cacheBreaker = isDev ?
 
 export default function jadeHelpers() {
   return function jadeHelpersMiddleware(req, res, next) {
-    res.locals.removeOldTerms = removeOldTerms;
-    res.locals.rev = rev;
-    // static data
-    res.locals.user = req.user;
-    res.locals.chunkManifest = chunkManifest;
-    res.locals._csrf = req.csrfToken ? req.csrfToken() : null;
+    Object.assign(
+      res.locals,
+      {
+        removeOldTerms,
+        rev,
+        cacheBreaker,
+        // static data
+        user: req.user,
+        chunkManifest,
+        _csrf: req.csrfToken ? req.csrfToken() : null,
+        theme: req.user &&
+          req.user.theme ||
+          req.cookies.theme ||
+          'default'
+      }
+    );
     if (req.csrfToken) {
       res.expose({ token: res.locals._csrf }, 'csrf');
     }
-    res.locals.theme = req.user && req.user.theme ||
-      req.cookies.theme ||
-      'default';
     next();
   };
 }