Stringify type hints, changelog

HISTORY.md

@@ -9,6 +9,11 @@ The third number is for emergencies when we need to start branches for older rel
 
 Our backwards-compatibility policy can be found [here](https://github.com/python-attrs/cattrs/blob/main/.github/SECURITY.md).
 
+## 24.1.1 (UNRELEASED)
+
+- Fix `BaseConverter.register_structure_hook_factory` and `BaseConverter.register_unstructure_hook_factory` type hints.
+  ([#578](https://github.com/python-attrs/cattrs/issues/578) [#579](https://github.com/python-attrs/cattrs/pull/579))
+
 ## 24.1.0 (2024-08-28)
 
 - **Potentially breaking**: Unstructuring hooks for `typing.Any` are consistent now: values are unstructured using their runtime type.

src/cattrs/converters.py

@@ -107,17 +107,13 @@
 # This typevar for the BaseConverter.
 AnyUnstructureHookFactoryBase = TypeVar(
     "AnyUnstructureHookFactoryBase",
-    bound=Union[
-        HookFactory[UnstructureHook], ExtendedUnstructureHookFactory[BaseConverter]
-    ],
+    bound="HookFactory[UnstructureHook] | ExtendedUnstructureHookFactory[BaseConverter]",
 )
 
 # This typevar for the Converter.
 AnyUnstructureHookFactory = TypeVar(
     "AnyUnstructureHookFactory",
-    bound=Union[
-        HookFactory[UnstructureHook], ExtendedUnstructureHookFactory[Converter]
-    ],
+    bound="HookFactory[UnstructureHook] | ExtendedUnstructureHookFactory[Converter]",
 )
 
 StructureHookFactory = TypeVar("StructureHookFactory", bound=HookFactory[StructureHook])
@@ -128,15 +124,13 @@
 # This typevar for the BaseConverter.
 AnyStructureHookFactoryBase = TypeVar(
     "AnyStructureHookFactoryBase",
-    bound=Union[
-        HookFactory[StructureHook], ExtendedStructureHookFactory[BaseConverter]
-    ],
+    bound="HookFactory[StructureHook] | ExtendedStructureHookFactory[BaseConverter]",
 )
 
 # This typevar for the Converter.
 AnyStructureHookFactory = TypeVar(
     "AnyStructureHookFactory",
-    bound=Union[HookFactory[StructureHook], ExtendedStructureHookFactory[Converter]],
+    bound="HookFactory[StructureHook] | ExtendedStructureHookFactory[Converter]",
 )