public FormStateInterface::setTemporary(array $temporary)

public FormStateInterface::disableCache()

public FormStateInterface::getErrors()

public &FormStateInterface::getValue($key, $default = NULL)

public FormStateInterface::setError(array &$element, $message

public FormStateInterface::setTemporaryValue($key, $value)

public FormStateInterface::isCached()

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 FormStateInterface::setProgrammed($programmed = TRUE)

public FormStateInterface::getValidateHandlers()