Expanded class hierarchy of FormBuilder in Drupal 10
- class \Drupal\Core\Form\FormBuilder implements \Drupal\Core\Form\FormBuilderInterface, \Drupal\Core\Form\FormValidatorInterface, \Drupal\Core\Form\FormSubmitterInterface, \Drupal\Core\Form\FormCacheInterface, \Drupal\Core\Security\TrustedCallbackInterface