Upgrade flake8-pyi to 22.4.0, enable Y026 in .flake8 config (#7650)

Author: AlexWaygood

.flake8

@@ -18,7 +18,6 @@
 #       F405 defined from star imports
 
 # Rules that we'd like to enable in the future:
-#       Y026 Use typing_extensions.TypeAlias for type aliases (blocked by #4913)
 #       Y027 Disallow importing typing.ContextManager, typing.OrderedDict &
 #            typing_extensions.OrderedDict (cannot be globally enabled while typeshed
 #            still contains stubs supporting Python 2).
@@ -32,12 +31,12 @@
 [flake8]
 per-file-ignores =
   *.py: E203, E501
-  *.pyi: E301, E302, E305, E501, E701, E741, F401, F403, F405, F822, Y026, Y037
+  *.pyi: E301, E302, E305, E501, E701, E741, F401, F403, F405, F822, Y037
   # Since typing.pyi defines "overload" this is not recognized by flake8 as typing.overload.
   # Unfortunately, flake8 does not allow to "noqa" just a specific error inside the file itself.
   # https://github.com/PyCQA/flake8/issues/1079
   #     F811 redefinition of unused '...'
-  stubs/*.pyi: E301, E302, E305, E501, E701, E741, F401, F403, F405, F822, Y026, Y027, Y037
-  stdlib/typing.pyi: E301, E302, E305, E501, E701, E741, F401, F403, F405, F811, F822, Y026, Y034, Y037
+  stubs/*.pyi: E301, E302, E305, E501, E701, E741, F401, F403, F405, F822, Y027, Y037
+  stdlib/typing.pyi: E301, E302, E305, E501, E701, E741, F401, F403, F405, F811, F822, Y034, Y037
 
 exclude = .venv*,.git,*_pb2.pyi,stdlib/@python2/*

requirements-tests.txt

@@ -4,7 +4,7 @@ pytype==2022.03.29; platform_system != "Windows" and python_version < "3.10"
 black==22.3.0
 flake8==4.0.1
 flake8-bugbear==21.11.29
-flake8-pyi==22.3.0
+flake8-pyi==22.4.0
 # must match .pre-commit-config.yaml
 isort==5.10.1
 tomli==1.2.2

stdlib/builtins.pyi

@@ -1289,7 +1289,7 @@ def next(__i: SupportsNext[_T]) -> _T: ...
 def next(__i: SupportsNext[_T], __default: _VT) -> _T | _VT: ...
 def oct(__number: int | SupportsIndex) -> str: ...
 
-_OpenFile = StrOrBytesPath | int
+_OpenFile = StrOrBytesPath | int  # noqa: Y026  # TODO: Use TypeAlias once mypy bugs are fixed
 _Opener: TypeAlias = Callable[[str, int], int]
 
 # Text mode: always returns a TextIOWrapper
@@ -1408,7 +1408,9 @@ class _SupportsPow3NoneOnly(Protocol[_E, _T_co]):
 class _SupportsPow3(Protocol[_E, _M, _T_co]):
     def __pow__(self, __other: _E, __modulo: _M) -> _T_co: ...
 
-_SupportsSomeKindOfPow = _SupportsPow2[Any, Any] | _SupportsPow3NoneOnly[Any, Any] | _SupportsPow3[Any, Any, Any]
+_SupportsSomeKindOfPow = (  # noqa: Y026  # TODO: Use TypeAlias once mypy bugs are fixed
+    _SupportsPow2[Any, Any] | _SupportsPow3NoneOnly[Any, Any] | _SupportsPow3[Any, Any, Any]
+)
 
 if sys.version_info >= (3, 8):
     @overload

stdlib/typing.pyi

@@ -1146,7 +1146,7 @@ class Pattern(Generic[AnyStr]):
 # Functions
 
 if sys.version_info >= (3, 7):
-    _get_type_hints_obj_allowed_types = (
+    _get_type_hints_obj_allowed_types = (  # noqa: Y026  # TODO: Use TypeAlias once mypy bugs are fixed
         object
         | Callable[..., Any]
         | FunctionType
@@ -1158,7 +1158,9 @@ if sys.version_info >= (3, 7):
         | MethodDescriptorType
     )
 else:
-    _get_type_hints_obj_allowed_types = object | Callable[..., Any] | FunctionType | BuiltinFunctionType | MethodType | ModuleType
+    _get_type_hints_obj_allowed_types = (  # noqa: Y026  # TODO: Use TypeAlias once mypy bugs are fixed
+        object | Callable[..., Any] | FunctionType | BuiltinFunctionType | MethodType | ModuleType
+    )
 
 if sys.version_info >= (3, 9):
     def get_type_hints(