jsonapi-8.x-2.x-dev/tests/modules/jsonapi_test_collection_count/jsonapi_test_collection_count.services.yml

services:
  count.jsonapi.resource_type.repository:
    class: Drupal\jsonapi_test_collection_count\ResourceType\CountableResourceTypeRepository
    public: false
    decorates: jsonapi.resource_type.repository
    parent: jsonapi.resource_type.repository