private static function outputStream($stream = null)
{
    if (!$stream) {
        $stream = static::$_outputStream ? static::$_outputStream : \STDOUT;
    }
    if (!$stream || !\is_resource($stream) || 'stream' !== \get_resource_type($stream)) {
        return false;
    }
    $stat = \fstat($stream);
    if (($stat['mode'] & 0170000) === 0100000) {
        // file
        static::$_outputDecorated = false;
    } else {
        static::$_outputDecorated =
            static::$_OS === \OS_TYPE_LINUX &&
            \function_exists('posix_isatty') &&
            \posix_isatty($stream);
    }
    return static::$_outputStream = $stream;
}