private function packagePath(string $relativePath): string
    {
    	$packagePath = rtrim(str_replace('/', DIRECTORY_SEPARATOR, $this->packagePath), DIRECTORY_SEPARATOR);
        $relativePath = ltrim(str_replace('/', DIRECTORY_SEPARATOR, $relativePath), DIRECTORY_SEPARATOR);

        return realpath($packagePath . DIRECTORY_SEPARATOR . $relativePath);
    }