fieldSettingsToConfigData example

$record['settings'] = $class::fieldSettingsFromConfigData($record['settings']);
    }
    return parent::mapFromStorageRecords($records);
  }

  /** * {@inheritdoc} */
  protected function mapToStorageRecord(EntityInterface $entity) {
    $record = parent::mapToStorageRecord($entity);
    $class = $this->fieldTypeManager->getPluginClass($record['field_type']);
    $record['settings'] = $class::fieldSettingsToConfigData($record['settings']);
    return $record;
  }

}