public function js($aliasOrUrl)
    {
        $url = $this->getJsUrl($aliasOrUrl);
        if (!$this->included->isIncluded($url)) {
            $this->included->markAsIncluded($url);
            $type = 'text/javascript';
            return new Tag('script', ['src' => $url, 'type' => $type]);
        } else {
            return new DataView();
        }
    }