App\Providers\AuthServiceProvider::boot PHP Method

    public function boot()
    {
        $this->registerPolicies();
        //
    }

 public function boot(GateContract $gate)
 {
     parent::boot($gate);
     $gate->before(function ($user, $ability) {
         if ($user->isSuperAdmin()) {
             return true;
         }
     });
     $gate->define('dashboard', function ($user) {
         return $user->isAdmin();
     });
     $gate->define('node-admin', function ($user, $type, $module, $node, $action, $id = NULL) {
         $custom_check = \CustomFunc::check_permission($type, $module, $node, $action, $id);
         if ($custom_check != 'none') {
             if ($custom_check == 'true') {
                 $return = true;
             } else {
                 $return = false;
             }
         } else {
             $return = false;
             if ($node->permission) {
                 if ($user->hasPermission($node->permission)) {
                     $return = true;
                 }
             } else {
                 $return = true;
             }
         }
         return $return;
     });
 }