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8 Commits

Author SHA1 Message Date
Eric Jolibois 58efd19f11
[ty] apply `KW_ONLY` sentinel only to local fields (#19986) 
fix https://github.com/astral-sh/ty/issues/1047

## Summary

This PR fixes how `KW_ONLY` is applied in dataclasses. Previously, the
sentinel leaked into subclasses and incorrectly marked their fields as
keyword-only; now it only affects fields declared in the same class.

```py
from dataclasses import dataclass, KW_ONLY

@dataclass
class D:
    x: int
    _: KW_ONLY
    y: str

@dataclass
class E(D):
    z: bytes

# This should work: x=1 (positional), z=b"foo" (positional), y="foo" (keyword-only)
E(1, b"foo", y="foo")

reveal_type(E.__init__)  # revealed: (self: E, x: int, z: bytes, *, y: str) -> None
```

<!-- What's the purpose of the change? What does it do, and why? -->

## Test Plan

<!-- How was it tested? -->
mdtests
 2025-08-19 11:01:35 -07:00
justin dc2e8ab377
[ty] support `kw_only=True` for `dataclass()` and `field()` (#19677) 
## Summary
https://github.com/astral-sh/ty/issues/111

adds support for `@dataclass(kw_only=True)`
(https://docs.python.org/3/library/dataclasses.html)

## Test Plan
- new mdtests
- triaged conformance diffs (notes here:
https://diffswarm.dev/d-01k2gknwyq82f6x17zqf3apjxc)
- `mypy_primer` no-op
 2025-08-14 08:02:55 -07:00
David Peter fcdffe4ac9
[ty] Pass down specialization to generic dataclass bases (#19472) 
## Summary

closes https://github.com/astral-sh/ty/issues/853

## Test Plan

Regression test
 2025-07-21 20:51:58 +02:00
David Peter b6579eaf04
[ty] Disallow assignment to `Final` class attributes (#19457) 
## Summary

Emit errors for the following assignments:
```py
class C:
    CLASS_LEVEL_CONSTANT: Final[int] = 1

C.CLASS_LEVEL_CONSTANT = 2
C().CLASS_LEVEL_CONSTANT = 2
```

## Test Plan

Updated and new MD tests
 2025-07-21 14:27:56 +02:00
justin 39b41838f3
[ty] synthesize __setattr__ for frozen dataclasses (#19307) 
## Summary

Synthesize a `__setattr__` method with a return type of `Never` for
frozen dataclasses.

https://docs.python.org/3/library/dataclasses.html#frozen-instances

https://docs.python.org/3/library/dataclasses.html#dataclasses.FrozenInstanceError

### Related
https://github.com/astral-sh/ty/issues/111
https://github.com/astral-sh/ruff/pull/17974#discussion_r2108527106
https://github.com/astral-sh/ruff/pull/18347#discussion_r2128174665

## Test Plan

New Markdown tests

---------

Co-authored-by: David Peter <mail@david-peter.de>
 2025-07-18 11:35:05 +02:00
David Peter ce2bdb9357
[ty] Conditionally defined dataclass fields (#19197) 
## Summary

Fixes a bug where conditionally defined dataclass fields were previously
ignored.

Thanks to @lipefree for reporting this.

## Test Plan

New Markdown tests
 2025-07-08 16:16:50 +02:00
David Peter 9a4b85d845
[ty] Add tests for dataclass fields annotated with `Final` (#19202) 
## Summary

Adds some tests for dataclass fields that are annotated with `Final`
(see comment
[here](https://github.com/astral-sh/ruff/pull/15768#issuecomment-3044737645)).
Turns out that nothing is needed here, everything already works as
expected (apart from the fact that we can assign to `Final` fields,
which is tracked in https://github.com/astral-sh/ty/issues/158

## Test Plan

New Markdown tests
 2025-07-08 12:33:46 +00:00
David Peter e212dc2e8e
[ty] Restructure/move dataclass tests (#19117) 
Before I'm adding even more dataclass-related files, let's organize them
in a separate folder.
 2025-07-03 10:36:14 +00:00