Sourced from ty's releases.

0.0.28

Release Notes

Released on 2026-04-02.

Bug fixes

• Mark loop header assignments as used to avoid false positives in "unused variable" diagnostics (#24336)

LSP server

• Show constructor signature of classes when hovering over them (#24257)

Core type checking

• Avoid emitting cascading diagnostics when parsing invalid type expressions (#24326)
• Handle most "deep" mutual TypeVar constraints (#24079)
• Improve consistency and quality of diagnostics relating to invalid type forms (#24325)
• Improve robustness of various type-qualifier-related checks (#24251)
• Infer the extra_items keyword argument to class-based TypedDicts as an annotation expression (#24362)
• Use bidirectional inference to fix false positives on operations such as x: list[int | None] = [None] * 2 (#24197)
• Sync vendored typeshed stubs (#24340). Typeshed diff
• Tighten up validation of subscripts and attributes in type expressions (#24329)
• Use infer_type_expression for parsing parameter annotations and return-type annotations (#24353)
• Use infer_type_expression for validating PEP-613 type aliases (#24370)
• Validate TypedDict fields when subclassing (#24338)
• Validate type qualifiers in functional TypedDict fields and the extra_items keyword to functional TypedDicts (#24360)
• Improve diagnostics for invalid functional TypedDicts (#24345)

Contributors

• @​zsol
• @​dcreager
• @​charliermarsh
• @​oconnor663
• @​AlexWaygood
• @​Glyphack

Install ty 0.0.28

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.28/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.28/ty-installer.ps1 | iex"
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... (truncated)

Sourced from ty's changelog.

0.0.28

Released on 2026-04-02.

Bug fixes

• Mark loop header assignments as used to avoid false positives in "unused variable" diagnostics (#24336)

LSP server

• Show constructor signature of classes when hovering over them (#24257)

Core type checking

• Avoid emitting cascading diagnostics when parsing invalid type expressions (#24326)
• Handle most "deep" mutual TypeVar constraints (#24079)
• Improve consistency and quality of diagnostics relating to invalid type forms (#24325)
• Improve robustness of various type-qualifier-related checks (#24251)
• Infer the extra_items keyword argument to class-based TypedDicts as an annotation expression (#24362)
• Use bidirectional inference to fix false positives on operations such as x: list[int | None] = [None] * 2 (#24197)
• Sync vendored typeshed stubs (#24340). Typeshed diff
• Tighten up validation of subscripts and attributes in type expressions (#24329)
• Use infer_type_expression for parsing parameter annotations and return-type annotations (#24353)
• Use infer_type_expression for validating PEP-613 type aliases (#24370)
• Validate TypedDict fields when subclassing (#24338)
• Validate type qualifiers in functional TypedDict fields and the extra_items keyword to functional TypedDicts (#24360)
• Improve diagnostics for invalid functional TypedDicts (#24345)

Contributors

• @​zsol
• @​dcreager
• @​charliermarsh
• @​oconnor663
• @​AlexWaygood
• @​Glyphack

0.0.27

Released on 2026-03-31.

Bug fixes

• Fix panic on debug builds when attempting to provide autocomplete suggestions for list[int]<CURSOR>() (#24167)
• Fix instance-attribute lookup in methods of protocol classes (#24213)
• Fix nested global and nonlocal lookups through forwarding scopes (#24279)
• Fix panic on list[Annotated[()]] (#24303)
• Fix stack overflow on type A = TypeIs[Callable[[], A]] (#24245)
• Use _cls as the name of the first argument for synthesized collections.namedtuple constructor methods (#24333)

... (truncated)

• 927aad2 Bump version to 0.0.28 (#3206)
• 29d288e Publish installers to /installers/ty/latest on the mirror (#3202)
• 5c9e342 Bump version to 0.0.27 (#3185)
• e6a5731 Update actions/cache action to v5.0.4 (#3172)
• c47b982 Update prek dependencies (#3173)
• 657abcf Update astral-sh/setup-uv action to v8 (#3174)
• 9e582cb Fetch the cargo-dist binary directly instead of using the installer (#3160)
• d5c51ea docs: use content tabs (#3146)
• 9893776 Use the release environment in publish-docs (#3147)
• See full diff in compare view

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