public static function getDocRoot(): string
    {
        $result = '.';
        $root = Arr::key('DOCUMENT_ROOT', $_SERVER, true);

        if ($root) {
            $result = $root;
        }

        $result = FS::clean($result);
        $result = FS::real($result);

        if (!$result) {
            $result = FS::real('.'); // @codeCoverageIgnore
        }

        return $result;
    }