Improve sql.annotation typings

Author: bryanforbes

sqlalchemy-stubs/sql/annotation.pyi

@@ -1,25 +1,28 @@
 from typing import Any
+from typing import Dict
+from typing import Tuple
+from typing import Type
+from typing import TypeVar
 
-from . import operators as operators
-from .base import HasCacheKey as HasCacheKey
-from .traversals import anon_map as anon_map
-from .visitors import InternalTraversal as InternalTraversal
-from .. import util as util
+from .. import util
 
-EMPTY_ANNOTATIONS: Any
+_A = TypeVar("_A", bound=Annotated)
+_T = TypeVar("_T")
+
+EMPTY_ANNOTATIONS: util.immutabledict[None, None]
 
 class SupportsAnnotations: ...
 class SupportsCloneAnnotations(SupportsAnnotations): ...
 class SupportsWrappingAnnotations(SupportsAnnotations): ...
 
 class Annotated:
-    def __new__(cls, *args: Any): ...
-    __dict__: Any = ...
+    def __new__(cls: Type[_T], *args: Any) -> _T: ...
+    __dict__: Dict[Any, Any] = ...
     def __init__(self, element: Any, values: Any) -> None: ...
-    def __reduce__(self): ...
-    def __hash__(self) -> Any: ...
-    def __eq__(self, other: Any) -> Any: ...
+    def __reduce__(self: _A) -> Tuple[Type[_A], Tuple[Any, Any]]: ...
+    def __hash__(self) -> int: ...
+    def __eq__(self, other: Any) -> bool: ...
     @property
-    def entity_namespace(self): ...
+    def entity_namespace(self) -> Any: ...
 
-annotated_classes: Any
+annotated_classes: Dict[Type[Any], Any]