All classes that implement MapperInterface

class \Drupal\Component\Plugin\PluginManagerBase implements CachedDiscoveryInterface, PluginManagerInterface
class \Drupal\Core\Entity\EntityManager
class \Drupal\Core\TypedData\TypedDataManager
class \Drupal\aggregator\Plugin\FetcherManager
class \Drupal\field\Plugin\Type\Formatter\FormatterPluginManager
class \Drupal\field\Plugin\Type\Widget\WidgetPluginManager
class \Drupal\layout\Plugin\Type\LayoutManager
class \Drupal\plugin_test\Plugin\AlterDecoratorTestPluginManager
class \Drupal\plugin_test\Plugin\DefaultsTestPluginManager
class \Drupal\plugin_test\Plugin\MockBlockManager
class \Drupal\plugin_test\Plugin\TestPluginManager
class \Drupal\rest\Plugin\Type\ResourcePluginManager
class \Drupal\views\Plugin\Type\JoinManager
class \Drupal\views\Plugin\Type\PluginManager
class \Drupal\views\Plugin\Type\WizardManager

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