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That's an interesting idea, but no we do not consider the return type of decorators when looking for fields. -Erik From: Patrick Arminio <patrick.arminio@gmail.com> Sent: Sunday, March 6, 2022 5:23 PM To: David Foster <davidfstr@gmail.com> Cc: Erik De Bonte <Erik.DeBonte@microsoft.com>; typing-sig@python.org Subject: Re: [Typing-sig] Re: Dataclass Transform draft PEP Does the PEP/implementation take into account the return type specified in the functions signature? For example, assuming we had Intersection as a type, would this work? class HasSomeAttr(typing.Protocol): attr: str @typing.dataclass_transform( kw_only_default=True, field_descriptors=(model_field, )) def create_model( *, init: bool = True, ) -> Callable[[Type[_T]], typing.Intersection[Type[_T], HasSomeAttr]]: ... -- Patrick Arminio