public function activate(Composer $composer, IOInterface $io)
    {
        //set config from root package
        $composer->getConfig()->merge(
            [
                'config' => [
                    'root_extra_config' => $composer->getPackage()->getExtra(),
                ],
            ]
        );

        $this->initConfig($composer);

        $this->initMultiVcsRepositories($composer, $io);
    }