first version finished

django/views/generic/detail.pyi

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+from django.core.handlers.wsgi import WSGIRequest
+from django.db.models.base import Model
+from django.db.models.query import QuerySet
+from django.template.response import TemplateResponse
+from typing import (
+    Any,
+    Dict,
+    List,
+    Optional,
+    Union,
+)
+
+
+class BaseDetailView:
+    def get(
+        self,
+        request: WSGIRequest,
+        *args,
+        **kwargs
+    ) -> TemplateResponse: ...
+
+
+class SingleObjectMixin:
+    def get_context_data(self, **kwargs) -> Dict[str, Any]: ...
+    def get_context_object_name(self, obj: Union[Model, Dict[str, str]]) -> Optional[str]: ...
+    def get_object(self, queryset: Optional[QuerySet] = ...) -> Model: ...
+    def get_queryset(self) -> QuerySet: ...
+    def get_slug_field(self) -> str: ...
+
+
+class SingleObjectTemplateResponseMixin:
+    def get_template_names(self) -> List[str]: ...