update design bundle for router

server/lib/fs_helper.js

@@ -0,0 +1,33 @@
+import fs from 'fs';
+import path from 'path';
+
+class FsHelper {
+
+  // http://stackoverflow.com/questions/5827612/node-js-fs-readdir-recursive-directory-search
+  static walk(dir, done) {
+    var results = [];
+    fs.readdir(dir, function(err, list) {
+      if (err) return done(err);
+      var i = 0;
+      (function next() {
+        var file = list[i++];
+        if (!file) return done(null, results);
+        file = path.resolve(dir, file);
+        fs.stat(file, function(err, stat) {
+          if (stat && stat.isDirectory()) {
+            FsHelper.walk(file, function(err, res) {
+              results = results.concat(res);
+              next();
+            });
+          } else {
+            results.push(file);
+            next();
+          }
+        });
+      })();
+    });
+  }
+
+}
+
+export default FsHelper;