App\Providers\WidgetServiceProvider::registerWidgets PHP Method

    protected function registerWidgets()
    {
        $pluginRegister = $this->app['xe.pluginRegister'];
        $pluginRegister->add(StorageSpace::class);
        $pluginRegister->add(ContentInfo::class);
        $pluginRegister->add(SystemInfo::class);
        $pluginRegister->add(HtmlWidget::class);
    }