Admit that **kwargs mapping subtypes may have no direct type parameters #18850
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hauntsaninja
approved these changes
Mar 29, 2025
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Diff from mypy_primer, showing the effect of this PR on open source code: hydra-zen (https://github.com/mit-ll-responsible-ai/hydra-zen)
+ src/hydra_zen/structured_configs/_implementations.py:2950: error: Argument 2 to "make_dataclass" has incompatible type "**StrictDataclassOptions"; expected "str" [arg-type]
+ src/hydra_zen/structured_configs/_implementations.py:2950: error: Argument 2 to "make_dataclass" has incompatible type "**StrictDataclassOptions"; expected "tuple[type, ...]" [arg-type]
+ src/hydra_zen/structured_configs/_implementations.py:2950: error: Argument 2 to "make_dataclass" has incompatible type "**StrictDataclassOptions"; expected "dict[str, Any] | None" [arg-type]
+ src/hydra_zen/structured_configs/_implementations.py:2950: error: Argument 2 to "make_dataclass" has incompatible type "**StrictDataclassOptions"; expected "bool" [arg-type]
+ src/hydra_zen/structured_configs/_implementations.py:2950: error: Argument 2 to "make_dataclass" has incompatible type "**StrictDataclassOptions"; expected "str | None" [arg-type]
+ src/hydra_zen/structured_configs/_implementations.py:3310: error: Argument 2 to "make_dataclass" has incompatible type "**StrictDataclassOptions"; expected "str" [arg-type]
+ src/hydra_zen/structured_configs/_implementations.py:3310: error: Argument 2 to "make_dataclass" has incompatible type "**StrictDataclassOptions"; expected "tuple[type, ...]" [arg-type]
+ src/hydra_zen/structured_configs/_implementations.py:3310: error: Argument 2 to "make_dataclass" has incompatible type "**StrictDataclassOptions"; expected "dict[str, Any] | None" [arg-type]
+ src/hydra_zen/structured_configs/_implementations.py:3310: error: Argument 2 to "make_dataclass" has incompatible type "**StrictDataclassOptions"; expected "bool" [arg-type]
+ src/hydra_zen/structured_configs/_implementations.py:3310: error: Argument 2 to "make_dataclass" has incompatible type "**StrictDataclassOptions"; expected "str | None" [arg-type]
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Okay, I'm lost in that 1000+ LOC method, looks quite scary, but fortunately it isn't relevant. The actual bug is here, attempt to overwrite a key with itself but (trivial to fix and worth fixing anyway, last wrapper dict should just go away, and version condition can define The error on our end is cryptic as always with Min-ish repro: import sys
from dataclasses import Field, make_dataclass
from typing import Any, ClassVar, Protocol, Required, TypedDict
class DataClass_(Protocol):
__dataclass_fields__: ClassVar[dict[str, Field[Any]]]
class _BaseOptions(TypedDict, total=False):
cls_name: str
namespace: dict[str, Any] | None
bases: tuple[type[DataClass_], ...]
init: bool
repr: bool
eq: bool
order: bool
unsafe_hash: bool
frozen: bool
class Py310Options(_BaseOptions):
match_args: bool
kw_only: bool
slots: bool
if sys.version_info < (3, 10):
BaseOptions = _BaseOptions
else:
BaseOptions = Py310Options
class StrictOptions(BaseOptions):
cls_name: Required[str] # type: ignore
def chk(o: StrictOptions) -> None:
make_dataclass(fields=[], **o) |
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Fixes #13675. I don't know why this check was ever needed (since #11151), but it doesn't seem correct.