protected function cleanupVendors(Storage $storage)
    {
        $this->outputLine();
        $this->outputLine('Cleanup vendors ...');
        $this->outputLine('-------------------');
        $count = $this->importer->cleanupVendors($storage, function (NodeInterface $vendor) {
            $this->outputLine(sprintf('%s deleted', $vendor->getLabel()));
        });
        if ($count > 0) {
            $this->outputLine(sprintf('  Deleted %d vendor(s)', $count));
        }
    }