Function inner

pydantic/config.py:1279–1291

(class_: _TypeT, /)

        final_config = config if config is not None else cast(ConfigDict, kwargs)

    def inner(class_: _TypeT, /) -> _TypeT:
        # Ideally, we would check for `class_` to either be a `TypedDict` or a stdlib dataclass.
        # However, the `@with_config` decorator can be applied *after* `@dataclass`. To avoid
        # common mistakes, we at least check for `class_` to not be a Pydantic model.
        from ._internal._utils import is_model_class

        if is_model_class(class_):
            raise PydanticUserError(
                f'Cannot use `with_config` on {class_.__name__} as it is a Pydantic model',
                code='with-config-on-model',
            )
        class_.__pydantic_config__ = final_config
        return class_

    return inner