class ContentTranslationUpdatesManager

class ContentTranslationUpdatesManager {
    
    /**
     * The entity field manager.
     *
     * @var \Drupal\Core\Entity\EntityFieldManagerInterface
     */
    protected $entityFieldManager;
    
    /**
     * The installed entity definition repository.
     *
     * @var \Drupal\Core\Entity\EntityLastInstalledSchemaRepositoryInterface;
     */
    protected $entityLastInstalledSchemaRepository;
    
    /**
     * The entity type manager.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * The entity definition update manager.
     *
     * @var \Drupal\Core\Entity\EntityDefinitionUpdateManagerInterface
     */
    protected $updateManager;
    
    /**
     * Constructs an updates manager instance.
     *
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager.
     * @param \Drupal\Core\Entity\EntityDefinitionUpdateManagerInterface $update_manager
     *   The entity definition update manager.
     * @param \Drupal\Core\Entity\EntityFieldManagerInterface $entity_field_manager
     *   The entity field manager.
     * @param \Drupal\Core\Entity\EntityLastInstalledSchemaRepositoryInterface $entity_last_installed_schema_repository
     *   The installed entity definition repository.
     */
    public function __construct(EntityTypeManagerInterface $entity_type_manager, EntityDefinitionUpdateManagerInterface $update_manager, EntityFieldManagerInterface $entity_field_manager = NULL, EntityLastInstalledSchemaRepositoryInterface $entity_last_installed_schema_repository = NULL) {
        $this->entityTypeManager = $entity_type_manager;
        $this->updateManager = $update_manager;
        if (!$entity_field_manager) {
            $entity_field_manager = \Drupal::service('entity_field.manager');
        }
        $this->entityFieldManager = $entity_field_manager;
        if (!$entity_last_installed_schema_repository) {
            $entity_last_installed_schema_repository = \Drupal::service('entity.last_installed_schema.repository');
        }
        $this->entityLastInstalledSchemaRepository = $entity_last_installed_schema_repository;
    }
    
    /**
     * Executes field storage definition updates if needed.
     *
     * @param array $entity_types
     *   A list of entity type definitions to be processed.
     */
    public function updateDefinitions(array $entity_types) {
        // Handle field storage definition creation, if needed.
        if ($this->updateManager
            ->needsUpdates()) {
            foreach ($entity_types as $entity_type_id => $entity_type) {
                $storage_definitions = $this->entityFieldManager
                    ->getFieldStorageDefinitions($entity_type_id);
                $installed_storage_definitions = $this->entityLastInstalledSchemaRepository
                    ->getLastInstalledFieldStorageDefinitions($entity_type_id);
                foreach (array_diff_key($storage_definitions, $installed_storage_definitions) as $storage_definition) {
                    
                    /** @var $storage_definition \Drupal\Core\Field\FieldStorageDefinitionInterface */
                    if ($storage_definition->getProvider() == 'content_translation') {
                        $this->updateManager
                            ->installFieldStorageDefinition($storage_definition->getName(), $entity_type_id, 'content_translation', $storage_definition);
                    }
                }
            }
        }
    }

}