All classes that implement MigrateIdMapInterface in Drupal 8
- class \Drupal\Tests\migrate\Unit\TestSqlIdMap implements \Drupal\Tests\migrate\Unit\Iterator
- class \Drupal\migrate\Plugin\migrate\id_map\NullIdMap implements MigrateIdMapInterface
- class \Drupal\migrate\Plugin\migrate\id_map\Sql implements ContainerFactoryPluginInterface, HighestIdInterface, MigrateIdMapInterface