turned ES5 users.js to ES6 users.js.es6 for babel

app/assets/javascripts/user.js

-(function() {
-  this.User = (function() {
-    function User(opts) {
-      this.opts = opts;
-      $('.profile-groups-avatars').tooltip({
-        "placement": "top"
-      });
-      this.initTabs();
-      $('.hide-project-limit-message').on('click', function(e) {
-        $.cookie('hide_project_limit_message', 'false', {
-          path: gon.relative_url_root || '/'
-        });
-        $(this).parents('.project-limit-message').remove();
-        return e.preventDefault();
-      });
-    }
-
-    User.prototype.initTabs = function() {
-      return new UserTabs({
-        parentEl: '.user-profile',
-        action: this.opts.action
-      });
-    };
-
-    return User;
-
-  })();
-
-}).call(this);

app/assets/javascripts/user.js.es6

+(global => {
+  global.User = class {
+    constructor(opts) {
+      this.opts = opts;
+      this.placeTop();
+      this.initTabs();
+      this.hideProjectLimitMessage();
+    }
+
+    placeTop() {
+      $('.profile-groups-avatars').tooltip({
+        "placement": "top"
+      });
+    }
+
+    initTabs() {
+      return new UserTabs({
+        parentEl: '.user-profile',
+        action: this.opts.action
+      });
+    }
+
+    hideProjectLimitMessage() {
+      $('.hide-project-limit-message').on('click', e => {
+        const path = '/';
+        $.cookie('hide_project_limit_message', 'false', {
+          path: path
+        });
+        $(this).parents('.project-limit-message').remove();
+        e.preventDefault();
+        return;
+      });
+    }
+  }
+})(window.gl || (window.gl = {}));

app/views/users/show.html.haml

@@ -123,6 +123,6 @@
 :javascript
   var userProfile;
 
-  userProfile = new User({
+  userProfile = new gl.User({
     action: "#{controller.action_name}"
   });