[ty] allow any string Literal type expression as a key when constructing a TypedDict#20792
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AlexWaygood merged 2 commits intoastral-sh:mainfrom Oct 9, 2025
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…cting a `TypedDict`
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Diagnostic diff on typing conformance testsNo changes detected when running ty on typing conformance tests ✅ |
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mtshiba
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FWIW I think the spec only states this for I think we can also update our bidirectional inference code, which makes the same assumption. |
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Oct 10, 2025
…ucting a `TypedDict` (#20806) ## Summary Based on @ibraheemdev's comment on #20792: > I think we can also update our bidirectional inference code, [which makes the same assumption](https://github.com/astral-sh/ruff/blob/main/crates/ty_python_semantic/src/types/infer/builder.rs?rgh-link-date=2025-10-09T21%3A30%3A31Z#L5860). This PR also adds more test cases for how `TypedDict` annotations affect generic call inference. ## Test Plan New tests in `typed_dict.md`
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Summary
This PR allows any string
Literaltype expression to be used as a key when constructing aTypedDict.The pattern of reusing constant key strings when constructing a
TypedDictseems to be common in several libraries (e.g., home-assistant/core).Currently, we only accept string literal keys when constructing a
TypedDict, but any expression that can be inferred to be of type stringLiteralis also acceptable. In fact, the spec explicitly states thatLiteraltype expressions andFinalnames should be allowed.Test Plan
New tests in
typed_dict.md