Improve typing of sysconfig.get_config_var(s)

stdlib/distutils/sysconfig.pyi

@@ -1,6 +1,8 @@
 import sys
 from collections.abc import Mapping
 from distutils.ccompiler import CCompiler
+from typing import Literal, overload
+from typing_extensions import deprecated
 
 PREFIX: str
 EXEC_PREFIX: str
@@ -10,8 +12,15 @@ project_base: str
 python_build: bool
 
 def expand_makefile_vars(s: str, vars: Mapping[str, str]) -> str: ...
+@overload
+@deprecated("SO is deprecated, use EXT_SUFFIX. Support is removed in Python 3.11")
+def get_config_var(name: Literal["SO"]) -> int | str | None: ...
+@overload
 def get_config_var(name: str) -> int | str | None: ...
-def get_config_vars(*args: str) -> Mapping[str, int | str]: ...
+@overload
+def get_config_vars() -> dict[str, str | int]: ...
+@overload
+def get_config_vars(arg: str, /, *args: str) -> list[str | int]: ...
 def get_config_h_filename() -> str: ...
 def get_makefile_filename() -> str: ...
 def get_python_inc(plat_specific: bool = ..., prefix: str | None = None) -> str: ...

stdlib/sysconfig.pyi

@@ -1,5 +1,6 @@
 import sys
 from typing import IO, Any, Literal, overload
+from typing_extensions import deprecated
 
 __all__ = [
     "get_config_h_filename",
@@ -15,11 +16,15 @@ __all__ = [
     "parse_config_h",
 ]
 
+@overload
+@deprecated("SO is deprecated, use EXT_SUFFIX. Support is removed in Python 3.11")
+def get_config_var(name: Literal["SO"]) -> Any: ...
+@overload
 def get_config_var(name: str) -> Any: ...
 @overload
 def get_config_vars() -> dict[str, Any]: ...
 @overload
-def get_config_vars(arg: str, *args: str) -> list[Any]: ...
+def get_config_vars(arg: str, /, *args: str) -> list[Any]: ...
 def get_scheme_names() -> tuple[str, ...]: ...
 
 if sys.version_info >= (3, 10):

stubs/setuptools/setuptools/_distutils/sysconfig.pyi

@@ -1,12 +1,20 @@
-from collections.abc import Mapping
+from typing import Literal, overload
+from typing_extensions import deprecated
 
 from setuptools._distutils.ccompiler import CCompiler
 
 PREFIX: str
 EXEC_PREFIX: str
 
+@overload
+@deprecated("SO is deprecated, use EXT_SUFFIX. Support will be removed when this module is synchronized with stdlib Python 3.11")
+def get_config_var(name: Literal["SO"]) -> int | str | None: ...
+@overload
 def get_config_var(name: str) -> int | str | None: ...
-def get_config_vars(*args: str) -> Mapping[str, int | str]: ...
+@overload
+def get_config_vars() -> dict[str, str | int]: ...
+@overload
+def get_config_vars(arg: str, /, *args: str) -> list[str | int]: ...
 def get_config_h_filename() -> str: ...
 def get_makefile_filename() -> str: ...
 def get_python_inc(plat_specific: bool = ..., prefix: str | None = ...) -> str: ...