astral-sh/ty 0.0.17

on GitHub

Release Notes

Released on 2026-02-13.

Bug fixes

• Avoid Literal promotion for constrained TypeVars with Literal bounds (#23209)
• Fix false positives in TypeVar shadowing checks (#23222)

Core type checking

• Support generic protocols (#21902)
• Perform control-flow analysis in loops (#22794)
• Support typing.Self in attribute annotations (#23108)
• Support type narrowing in situations with calls to NoReturn functions (#23109)
• Support type narrowing and reachability analysis based on os.name checks (#23230)
• Detect overrides of Final class variables in subclasses (#23180)
• Fix bound method access on None (#23246)
• Fix method calls on subclasses of Any (#23248)
• Disallow type variables within PEP-695 type variable bounds and constraints (#22982)
• Emit error for attribute access on union where some elements lack the attribute (#23042)
• Emit error for invalid typevar defaults (#23194)
• Improve display of ParamSpecs in some situations (#23211)

LSP server

• Add hover and go-to-declaration support for subscript literals (#22837)
• Assign lower completion ranking to deprecated names in auto import (#23188)
• Improve spans of references to submodules imported in an __init__.py (#21795)
• Include conditional symbols (like datetime.UTC) in auto-import in more cases (#23249)
• Support auto-import for symbols in inlay hints (#22111)
• Include overload declarations in find-references (#23215)

Performance

• Avoid UnionBuilder overhead when creating a new union from the filtered elements of an existing union (#22352)

Other changes

• Allow discovering dependencies in system Python environments (#22994)
• Apply workspace settings to virtual files (#23228)
• Add support for --output-format=junit (#22125)
• Use a smaller diagnostic range for inconsistent-mro diagnostics (#23213)

Contributors

• @carljm
• @BurntSushi
• @charliermarsh
• @Glyphack
• @cetanu
• @AlexWaygood
• @joelostblom
• @Gankra
• @mtshiba
• @MatthewMckee4
• @Hugo-Polloli
• @sharkdp
• @alex
• @dcreager
• @oconnor663

Install ty 0.0.17

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/ty/releases/download/0.0.17/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/ty/releases/download/0.0.17/ty-installer.ps1 | iex"

Download ty 0.0.17