code: public function install(RepositoryInterface $repo, InstallOperation $operation)
      {
          $package = $operation->getPackage();
          $installer = $this->getInstaller($package->getType());
          $installer->install($repo, $package);
          $this->markForNotification($package);
      }
docs: Executes install operation.
  
  @param RepositoryInterface $repo      repository in which to check
  @param InstallOperation    $operation operation instance