public static function assetsInCache($source, $filename)
    {
        $dest = OL_ZEUS_DISTPATH.$filename;

        // Create file
        if (!file_exists($dest)) {
            $ctns = file_exists($source) ? file_get_contents($source) : '';
            Helpers::filePutContents($dest, $ctns, 'This file has been auto-generated');
        }
    }