Expanded class hierarchy of EntityReferenceIdFormatter in Entity reference 8
- class \Drupal\entityreference\Plugin\field\formatter\EntityReferenceFormatterBase extends \Drupal\field\Plugin\Type\Formatter\FormatterBase
- class \Drupal\entityreference\Plugin\field\formatter\EntityReferenceEntityFormatter
- class \Drupal\entityreference\Plugin\field\formatter\EntityReferenceIdFormatter
- class \Drupal\entityreference\Plugin\field\formatter\EntityReferenceLabelFormatter