FieldStorageConfig::preSave

public FieldStorageConfig::preSave(EntityStorageInterface $storage)

public function preSave(EntityStorageInterface $storage) {
  // Clear the derived data about the field.
  unset($this->schema);

  // Filter out unknown settings and make sure all settings are present, so
  // that a complete field definition is passed to the various hooks and
  // written to config.
  $field_type_manager = \Drupal::service('plugin.manager.field.field_type');
  $default_settings = $field_type_manager->getDefaultStorageSettings($this->type);
  $this->settings = array_intersect_key($this->settings, $default_settings) + $default_settings;

  if ($this->isNew()) {
    $this->preSaveNew($storage);
  }
  else {
    $this->preSaveUpdated($storage);
  }

  parent::preSave($storage);
}