class FileStorageFactory

class FileStorageFactory {
    
    /**
     * Returns a FileStorage object working with the sync config directory.
     *
     * @return \Drupal\Core\Config\FileStorage FileStorage
     *
     * @throws \Drupal\Core\Config\ConfigDirectoryNotDefinedException
     *   In case the sync directory does not exist or is not defined in
     *   $settings['config_sync_directory'].
     */
    public static function getSync() {
        $directory = Settings::get('config_sync_directory', FALSE);
        if ($directory === FALSE) {
            throw new ConfigDirectoryNotDefinedException('The config sync directory is not defined in $settings["config_sync_directory"]');
        }
        return new FileStorage($directory);
    }

}