ConfigImporter::processExtension

protected ConfigImporter::processExtension($type, $op, $name)

protected function processExtension($type, $op, $name) {
  // Set the config installer to use the sync directory instead of the
  // extensions own default config directories.
  \Drupal::service('config.installer')
    ->setSourceStorage($this->storageComparer->getSourceStorage());
  if ($type == 'module') {
    $this->moduleInstaller->$op(array($name), FALSE);
    // Installing a module can cause a kernel boot therefore reinject all the
    // services.
    $this->reInjectMe();
    // During a module install or uninstall the container is rebuilt and the
    // module handler is called from drupal_get_complete_schema(). This causes
    // the container's instance of the module handler not to have loaded all
    // the enabled modules.
    $this->moduleHandler->loadAll();
  }
  if ($type == 'theme') {
    // Theme uninstalls possible remove default or admin themes therefore we
    // need to import this before doing any. If there are no uninstalls and
    // the default or admin theme is changing this will be picked up whilst
    // processing configuration.
    if ($op == 'uninstall' && $this->processedSystemTheme === FALSE) {
      $this->importConfig(StorageInterface::DEFAULT_COLLECTION, 'update', 'system.theme');
      $this->configManager->getConfigFactory()->reset('system.theme');
      $this->processedSystemTheme = TRUE;
    }
    $this->themeHandler->$op(array($name));
  }

  $this->setProcessedExtension($type, $op, $name);
}