public function getPackPath(Container $app) {
        static $paths = [];
        $me = get_class($this);
        if (empty($paths[$me])) {
            $paths[$me] = dirname($this->getReflector()->getFileName());
        }
        return $paths[$me];
    }
public function getPackPath(Container $app) {
        static $paths = [];
        $me = get_class($this);
        if (empty($paths[$me])) {
            $paths[$me] = dirname($this->getReflector()->getFileName());
        }
        return $paths[$me];
    }
Returns the the pack namespace path.
@return string