[ty] Add synthetic members to completions on dataclasses #21446
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sharkdp
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AlexWaygood,
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dcreager
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sharkdp
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sharkdp
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Nov 14, 2025
Diagnostic diff on typing conformance testsChanges were detected when running ty on typing conformance tests--- old-output.txt 2025-11-14 10:03:18.123685573 +0000
+++ new-output.txt 2025-11-14 10:03:21.738714597 +0000
@@ -266,12 +266,6 @@
dataclasses_kwonly.py:61:1: error[missing-argument] No argument provided for required parameter `c`
dataclasses_kwonly.py:61:9: error[invalid-argument-type] Argument is incorrect: Expected `int`, found `float`
dataclasses_kwonly.py:61:14: error[parameter-already-assigned] Multiple values provided for parameter `b`
-dataclasses_match_args.py:18:1: error[type-assertion-failure] Argument does not have asserted type `tuple[Literal["x"]]`
-dataclasses_match_args.py:18:13: error[unresolved-attribute] Class `DC1` has no attribute `__match_args__`
-dataclasses_match_args.py:26:1: error[type-assertion-failure] Argument does not have asserted type `tuple[Literal["x"]]`
-dataclasses_match_args.py:26:13: error[unresolved-attribute] Class `DC2` has no attribute `__match_args__`
-dataclasses_match_args.py:34:1: error[type-assertion-failure] Argument does not have asserted type `tuple[Literal["x"]]`
-dataclasses_match_args.py:34:13: error[unresolved-attribute] Class `DC3` has no attribute `__match_args__`
dataclasses_match_args.py:42:1: error[unresolved-attribute] Class `DC4` has no attribute `__match_args__`
dataclasses_match_args.py:49:1: error[type-assertion-failure] Argument does not have asserted type `tuple[()]`
dataclasses_order.py:50:4: error[unsupported-operator] Operator `<` is not supported for types `DC1` and `DC2`
@@ -999,5 +993,5 @@
typeddicts_usage.py:28:17: error[missing-typed-dict-key] Missing required key 'name' in TypedDict `Movie` constructor
typeddicts_usage.py:28:18: error[invalid-key] Invalid key for TypedDict `Movie`: Unknown key "title"
typeddicts_usage.py:40:24: error[invalid-type-form] The special form `typing.TypedDict` is not allowed in type expressions. Did you mean to use a concrete TypedDict or `collections.abc.Mapping[str, object]` instead?
-Found 1001 diagnostics
+Found 995 diagnostics
WARN A fatal error occurred while checking some files. Not all project files were analyzed. See the diagnostics list above for details.
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sharkdp
commented
Nov 14, 2025
AlexWaygood
reviewed
Nov 14, 2025
AlexWaygood
reviewed
Nov 14, 2025
AlexWaygood
approved these changes
Nov 14, 2025
19 tasks
dcreager
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this pull request
Nov 14, 2025
* origin/main: (59 commits) [ty] Improve diagnostic range for `non-subscriptable` diagnostics (#21461) [ty] Improve literal promotion heuristics (#21439) [ty] Further improve details around which expressions should be deferred in stub files (#21456) [ty] Improve generic class constructor inference (#21442) [ty] Propagate type context through conditional expressions (#21443) [ty] Suppress completions when introducing names with `as` [ty] Add panic-by-default await methods to `TestServer` (#21451) [ty] name is parameter and global is a syntax error (#21312) [ty] Fixup a few details around version-specific dataclass features (#21453) [ty] Support attribute-expression `TYPE_CHECKING` conditionals (#21449) [ty] Support stringified annotations in value-position `Annotated` instances (#21447) [ty] Type inference for genererator expressions (#21437) [ty] Make `__getattr__` available for `ModuleType` instances (#21450) [ty] Increase default receive timeout in tests to 10s (#21448) [ty] Add synthetic members to completions on dataclasses (#21446) [ty] Support legacy `typing` special forms in implicit type aliases (#21433) Bump 0.14.5 (#21435) [ty] Support `type[…]` and `Type[…]` in implicit type aliases (#21421) [ty] Respect notebook cell boundaries when adding an auto import (#21322) Update PyCharm setup instructions (#21409) ...
dcreager
added a commit
that referenced
this pull request
Nov 14, 2025
* dcreager/deep-comparison: (64 commits) assuming SubtypingAssuming implies_subtype_of name tweak Apply suggestions from code review [ty] Improve diagnostic range for `non-subscriptable` diagnostics (#21461) [ty] Improve literal promotion heuristics (#21439) [ty] Further improve details around which expressions should be deferred in stub files (#21456) [ty] Improve generic class constructor inference (#21442) [ty] Propagate type context through conditional expressions (#21443) [ty] Suppress completions when introducing names with `as` [ty] Add panic-by-default await methods to `TestServer` (#21451) [ty] name is parameter and global is a syntax error (#21312) [ty] Fixup a few details around version-specific dataclass features (#21453) [ty] Support attribute-expression `TYPE_CHECKING` conditionals (#21449) [ty] Support stringified annotations in value-position `Annotated` instances (#21447) [ty] Type inference for genererator expressions (#21437) [ty] Make `__getattr__` available for `ModuleType` instances (#21450) [ty] Increase default receive timeout in tests to 10s (#21448) [ty] Add synthetic members to completions on dataclasses (#21446) ...
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Summary
Add synthetic members to completions on dataclasses and dataclass instances.
Also, while we're at it, add support for
__weakref__and__match_args__.closes astral-sh/ty#1542
Test Plan
New Markdown tests