Fix group overload (#2565)

CHANGES.rst

@@ -5,6 +5,8 @@ Version 8.1.6
 
 Unreleased
 
+-   Fix an issue with type hints for ``@click.group()``. :issue:`2558`
+
 
 Version 8.1.5
 -------------

src/click/decorators.py

@@ -271,15 +271,11 @@ def group(
 
 
 # variant: name omitted, cls _must_ be a keyword argument, @group(cmd=GroupCls, ...)
-# The _correct_ way to spell this overload is to use keyword-only argument syntax:
-# def group(*, cls: t.Type[GrpType], **attrs: t.Any) -> ...
-# However, mypy thinks this doesn't fit the overloaded function. Pyright does
-# accept that spelling, and the following work-around makes pyright issue a
-# warning that GrpType could be left unsolved, but mypy sees it as fine. *shrug*
 @t.overload
 def group(
     name: None = None,
-    cls: t.Type[GrpType] = ...,
+    *,
+    cls: t.Type[GrpType],
     **attrs: t.Any,
 ) -> t.Callable[[_AnyCallable], GrpType]:
     ...

tests/typing/typing_group_kw_options.py

@@ -0,0 +1,11 @@
+from typing_extensions import assert_type
+
+import click
+
+
+@click.group(context_settings={})
+def hello() -> None:
+    pass
+
+
+assert_type(hello, click.Group)