private function cleanUp()
    {
        if ($this->quiet) {
            $errors = explode(PHP_EOL, ob_get_clean());
            $shown = [];

            foreach ($errors as $error) {
                if ($error && !in_array($error, $shown)) {
                    out($error, 'error');
                    $shown[] = $error;
                }
            }
        }

        if (file_exists($this->tmpPharPath)) {
            @unlink($this->tmpPharPath);
        }
        if (file_exists($this->tmpPubkeyPath)) {
            @unlink($this->tmpPharPath);
        }
    }