getFieldSynchronizationSettings example

  public function __construct(EntityTypeManagerInterface $entity_type_manager, FieldTypePluginManagerInterface $field_type_manager) {
    $this->entityTypeManager = $entity_type_manager;
    $this->fieldTypeManager = $field_type_manager;
  }

  /** * {@inheritdoc} */
  public function getFieldSynchronizedProperties(FieldDefinitionInterface $field_definition) {
    $properties = [];
    $settings = $this->getFieldSynchronizationSettings($field_definition);
    foreach ($settings as $group => $translatable) {
      if (!$translatable) {
        $field_type_definition = $this->fieldTypeManager->getDefinition($field_definition->getType());
        if (!empty($field_type_definition['column_groups'][$group]['columns'])) {
          $properties = array_merge($properties, $field_type_definition['column_groups'][$group]['columns']);
        }
      }
    }
    return $properties;
  }