An associative array of form value keys to be removed by cleanValues(). Any values that are temporary but must still be displayed as values

public FormStateDecoratorBase::isMethodType($method_type)

public FormStateInterface::getErrors()

The response to be enforced. Type: \Symfony\Component\HttpFoundation\Response File

public FormStateDecoratorBase::getErrors()

The theme manager. Type:

public FormValidatorInterface::executeValidateHandlers(&$form

public FormCacheInterface::setCache($form_build_id, $form, FormStateInterface

Stores information about the state of a form. Hierarchy class \Drupal\Core\Form\

The complete form structure. #process, #after_build, #element_validate, and other handlers being invoked on a form element may use this reference