astral-sh/ty 0.0.1-alpha.23

on GitHub

Release Notes

Released on 2025-10-16.

Bug fixes

• Fix handling of dataclass field()s without default values (#20914)
• Fix false-positive diagnostics on super() calls (#20814, #20843)
• Fix match pattern value narrowing to use equality semantics (#20882)
• Fix "missing root" panic when handling completion requests (#20917)
• Fix overwriting of declared base class attributes through undeclared subclass members (#20764)
• Fix runaway execution time for mutually referential instance attributes (#20645)

CLI

• For unresolved-import diagnostics, limit the shown import paths to at most five, unless in verbose mode (#20912)
• Write files that are slow to type check to log output (#20836)
• Remove "pre-release software" warning (#20817)

LSP server

• Improve ranking of autocomplete suggestions (#20807)

Type inference and diagnostics

• Use return type annotations as context for bidirectional type inference (#20528)
• Use bidirectional type context for TypedDict construction (#20806)
• Add support for unpacking of heterogeneous tuples in unions (#20377)
• Add a new diagnostic for generic classes that reference typevars from an enclosing scope (#20822)
• Add hint when accessing standard library module attributes that are not available on the configured Python version (#20909)
• Treat functions, methods, and dynamic types as function-like Callables (#20842)
• Treat Callables as bound-method descriptors in special cases (#20802)
• Treat Callable dunder members as bound method descriptors (#20860)
• Sync vendored typeshed stubs (#20876). Typeshed diff

Performance improvements

• Improve performance by caching union simplification type relations (#20477)

Contributors

• @mtshiba
• @AlexWaygood
• @ericmarkmartin
• @carljm
• @ntBre
• @sharkdp
• @BurntSushi
• @Gankra
• @MichaReiser
• @dcreager

Install ty 0.0.1-alpha.23

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/ty/releases/download/0.0.1-alpha.23/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/ty/releases/download/0.0.1-alpha.23/ty-installer.ps1 | iex"

Download ty 0.0.1-alpha.23