Add typing to _function_type and _build_proxy_class

Author: DanielNoord

astroid/helpers.py

@@ -21,21 +21,23 @@
 from astroid.typing import InferenceResult
 
 
-def _build_proxy_class(cls_name, builtins):
+def _build_proxy_class(cls_name: str, builtins: nodes.Module) -> nodes.ClassDef:
     proxy = raw_building.build_class(cls_name)
     proxy.parent = builtins
     return proxy
 
 
-def _function_type(function, builtins):
+def _function_type(
+    function: nodes.Lambda | bases.UnboundMethod, builtins: nodes.Module
+) -> nodes.ClassDef:
     if isinstance(function, scoped_nodes.Lambda):
         if function.root().name == "builtins":
             cls_name = "builtin_function_or_method"
         else:
             cls_name = "function"
     elif isinstance(function, bases.BoundMethod):
         cls_name = "method"
-    elif isinstance(function, bases.UnboundMethod):
+    else:
         cls_name = "function"
     return _build_proxy_class(cls_name, builtins)
 

astroid/manager.py

@@ -86,7 +86,7 @@ def unregister_transform(self):
         return self._transform.unregister_transform
 
     @property
-    def builtins_module(self):
+    def builtins_module(self) -> nodes.Module:
         return self.astroid_cache["builtins"]
 
     def visit_transforms(self, node):

astroid/typing.py

@@ -32,7 +32,7 @@ class InferenceErrorInfo(TypedDict):
 class AstroidManagerBrain(TypedDict):
     """Dictionary to store relevant information for a AstroidManager class."""
 
-    astroid_cache: dict
+    astroid_cache: dict[str, nodes.Module]
     _mod_file_cache: dict
     _failed_import_hooks: list
     always_load_extensions: bool