public function setFile($src, $type = 'text/javascript', array $params = [], $prepend = false, $conditional = '')
    {
        //pobieranie timestampu
        $ts = $this->_getLocationTimestamp($src);
        return $this->headScript(array_merge($params, ['type' => $type, 'src' => $ts > 0 ? $this->_getPublicSrc($src) : $src, 'ts' => $ts]), $prepend, $conditional);
    }