Pagekit\Installer\Package\PackageManager::__construct PHP Method

    public function __construct($output = null)
    {
        $this->output = $output ?: new StreamOutput(fopen('php://output', 'w'));
        $config = [];
        foreach (['path.temp', 'path.cache', 'path.vendor', 'path.artifact', 'path.packages', 'system.api'] as $key) {
            $config[$key] = App::get($key);
        }
        $this->composer = new Composer($config, $output);
    }