public function getBootstrapFile()
    {
        if (isset($this->raw->bootstrap)) {
            $path = $this->raw->bootstrap;

            if (false === Path::isAbsolute($path)) {
                $path = Path::canonical(
                    $this->getBasePath() . DIRECTORY_SEPARATOR . $path
                );
            }

            return $path;
        }

        return null;
    }