Flarum\Event\ConfigureWebApp::isAdmin PHP Method

    public function isAdmin()
    {
        return $this->controller instanceof AdminWebAppController;
    }

 /**
  * Modifies the client view for the Admin.
  *
  * @param ConfigureWebApp $event
  */
 public function addAdminAssets(ConfigureWebApp $event)
 {
     if ($event->isAdmin()) {
         $event->addAssets([__DIR__ . '/../../less/admin/settingsPage.less', __DIR__ . '/../../js/admin/dist/extension.js']);
         $event->addBootstrapper('pushedx/realtime-chat/main');
     }
 }