An associative array of information stored by Form API that is necessary to build and rebuild the form from cache when the original context may no longer be available:

public FormState::getCacheableArray() Returns

public FormState::setResponse(Response $response) Sets

Used to redirect the form on submission. This property is uncacheable. Type: \Drupal\Core\

If TRUE, there is a file element and Form API will set the appropriate 'enctype' HTML attribute on the form. Type: bool

public FormState::setRebuildInfo(array $rebuild_info) Sets

protected FormState::moduleLoadInclude($module, $type, $name = NULL)

public FormState::getErrors() Returns an

Tracks if the form has finished validation. This property is uncacheable. Type: bool

public &FormState::get($property) Gets