protected FormBuilder::handleInputElement($form_id, &$element, FormStateInterface

Provides an interface for an object containing the current state of a form. This is passed to all form related code so that the caller can use

public ConfirmFormInterface::getCancelUrl()

public FormState::isValidationComplete() Determines

public FormState::cleanValues() Removes

public FormStateDecoratorBase::cleanValues()

public FormStateInterface::hasFileElement()

The array of values as they were submitted by the user. These are raw and unvalidated, so should not be used without a thorough understanding

public FormBuilder::executeValidateHandlers(&$form, FormStateInterface

public FormBase::validateForm(array &$form, FormStateInterface $form_state)