ty 0.0.13

on Python PyPI

Release Notes

Released on 2026-01-21.

Bug fixes

• Fix --force-exclude when excluding entire directories (#22595)
• Fix missing syntax highlighting for aliased import names (#22675)
• Highlight interpolated-parts in t-strings (#22674)
• Fix the inferred MRO of functional namedtuple classes (#22722)
• Make special cases for subscript inference exhaustive, ensuring that the special casing for tuple subscripts is applied when a union of tuples or an alias to a tuple type is subscripted (#22035)

LSP server

• Improve completion suggestions inside class definitions (#22571)
• Improve performance of completions (#22630)
• Remove completion suggestions for redundant re-exports that share the same top-most module (#22581)

Core type checking

• Add basic support for overloads in ParamSpec (#21946)
• Allow ... as a default value for any parameter if the function is in an if TYPE_CHECKING block (#22624)
• Allow if type(x) is Y narrowing for types other than class-literal types (#22729)
• Avoid overload errors when detecting dataclass-on-tuple (#22687)
• Avoid reporting overload errors for successful union variants (#22688)
• Ban NewTypes with generic bases (#22653)
• Fix PEP 695 type aliases not expanding in overload resolution (#22589)
• Fix the return type for synthesized NamedTuple.__new__ methods (#22625)
• Emit diagnostics for NamedTuple, TypedDict, Enum or Protocol classes decorated with @dataclass (#22672)
• Emit invalid-type-form diagnostics for stringified annotations where the quoted expression is invalid (#22752)
• Infer the implicit type of cls in __new__ methods (#22584)
• Make ModuleType and object attributes available on namespace packages (#22606)
• Make NamedTuple(...) and namedtuple(...) calls stricter (#22601)
• Narrow on bool and byte subscripts (#22684)
• Narrow on negative subscript indexing (#22682)
• Override __file__ to str when applicable on imported modules (#22333)
• Add bidirectional inference for comprehensions (#22564)
• Recognize string-literal types as subtypes of Sequence[Literal[chars]] (#22415)
• Add right-hand-side narrowing for if Foo is type(x) expressions (#22608)
• Add simple syntactic validation for the right-hand side of PEP-613 type aliases (#22652)
• Add support for passing typename and field_names by keyword argument to collections.namedtuple() calls (#22660)
• Add support for starred unpacking in class bases (#22591)
• Validate constructor arguments when a class is used as a decorator (#22377)
• Validate field names for typing.NamedTuple(...) (#22599)
• Add diagnostic on overridden __setattr__ and __delattr__ in frozen dataclasses (#21430)
• Fix unary operators on NewTypes of float or complex (#22605)

Configuration

• Support overriding respect-type-ignore-comments (#22615)

Diagnostics

• Don't add a subdiagnostic pointing to the TypeVar definition if the TypeVar is Self (#22646)
• Show final search path instead of "and 1 more paths" (#22776)
• Group type[] elements together when displaying union types (#22592)

Performance

• Cache ClassType::nearest_disjoint_base (#22065)

Other changes

• Sync vendored typeshed stubs (#22590, Typeshed diff

Contributors

• @bxff
• @jhartum
• @thejchap
• @AlexWaygood
• @charliermarsh
• @RasmusNygren
• @mswart
• @MatthewMckee4
• @11happy
• @ibraheemdev
• @sinon
• @MichaReiser
• @carljm
• @BurntSushi
• @dhruvmanila
• @oconnor663
• @zanieb

Install ty 0.0.13

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/ty/releases/download/0.0.13/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/ty/releases/download/0.0.13/ty-installer.ps1 | iex"

Download ty 0.0.13