public function importFromVendor(string $vendorDir)
    {
        $mappingFile = $vendorDir . '/container_map.php';

        if (!(file_exists($mappingFile) && is_readable($mappingFile)))
        {
            throw new ContainerNamespaceException("Could not find the the container map file at: " . $mappingFile);
        }

        $vendorPaths = require $mappingFile;
        $this->paths = array_merge($vendorPaths, $this->paths);
    }