FieldDefinitionInterface

class \Drupal\Core\Field\BaseFieldDefinition extends \Drupal\Core\TypedData\ListDataDefinition implements \Drupal\Core\Field\FieldDefinitionInterface, \Drupal\Core\Field\FieldStorageDefinitionInterface, \Drupal\Core\Field\RequiredFieldStorageDefinitionInterface uses \Drupal\Core\Cache\UnchangingCacheableDependencyTrait, \Drupal\Core\Field\FieldInputValueNormalizerTrait
class \Drupal\Core\Field\Entity\BaseFieldOverride extends \Drupal\Core\Field\FieldConfigBase
class \Drupal\Core\Field\FieldConfigBase extends \Drupal\Core\Config\Entity\ConfigEntityBase implements \Drupal\Core\Field\FieldConfigInterface uses \Drupal\Core\Field\FieldInputValueNormalizerTrait
class \Drupal\Core\Field\FieldDefinition extends \Drupal\Core\TypedData\ListDataDefinition implements \Drupal\Core\Field\FieldDefinitionInterface uses \Drupal\Core\Cache\UnchangingCacheableDependencyTrait, \Drupal\Core\Field\FieldInputValueNormalizerTrait
class \Drupal\field\Entity\FieldConfig extends \Drupal\Core\Field\FieldConfigBase implements \Drupal\field\FieldConfigInterface