All classes that implement SchemaPluginInterface in GraphQL 8.3
- class \Drupal\graphql\Plugin\GraphQL\Schemas\SchemaPluginBase implements CacheableDependencyInterface, ContainerFactoryPluginInterface, SchemaBuilderInterface, SchemaPluginInterface
- class \Drupal\graphql_core\Plugin\GraphQL\Schemas\DefaultSchema
- class \Drupal\graphql_test\Plugin\GraphQL\Schemas\TestSchema implements SchemaPluginInterface