None. If you need it use
Brotkrueml\Schema\Core\Model\AbstractType->getPropertyNames()
and loop over the property names with
Brotkrueml\Schema\Core\Model\AbstractType->getProperty().
Use Brotkrueml\Schema\Type\TypeRegistry which is a singleton
and can be instantiated with GeneralUtility::makeInstance() or
injected with dependency injection in TYPO3 v10+. See section
List of types.