ConfigManager::uninstall

public ConfigManager::uninstall($type, $name)

public function uninstall($type, $name) {
  $entities = $this->getConfigEntitiesToChangeOnDependencyRemoval($type, [$name], FALSE);
  // Fix all dependent configuration entities.
  /** @var \Drupal\Core\Config\Entity\ConfigEntityInterface $entity */
  foreach ($entities['update'] as $entity) {
    $entity->save();
  }
  // Remove all dependent configuration entities.
  foreach ($entities['delete'] as $entity) {
    $entity->setUninstalling(TRUE);
    $entity->delete();
  }

  $config_names = $this->configFactory->listAll($name . '.');
  foreach ($config_names as $config_name) {
    $this->configFactory->getEditable($config_name)->delete();
  }

  // Remove any matching configuration from collections.
  foreach ($this->activeStorage->getAllCollectionNames() as $collection) {
    $collection_storage = $this->activeStorage->createCollection($collection);
    $collection_storage->deleteAll($name . '.');
  }

  $schema_dir = drupal_get_path($type, $name) . '/' . InstallStorage::CONFIG_SCHEMA_DIRECTORY;
  if (is_dir($schema_dir)) {
    // Refresh the schema cache if uninstalling an extension that provides
    // configuration schema.
    $this->typedConfigManager->clearCachedDefinitions();
  }
}