public function getConfigsPath(Container $app)
    {
        static $paths = [];
        $me = get_class($this);
        if (empty($paths[$me])) {
            $subpath = $this->packOptions['configs_subpath'];
            $paths[$me] = dirname($this->getReflector()->getFileName()) . '/' . $subpath;
        }
        return $paths[$me];
    }