astral-sh/ty 0.0.74

on GitHub

Release Notes

Released on 2026-08-22.

Bug fixes

• Avoid duplicate bindings in multi-target assignments (#27938)
• Avoid panic on unpacked kwargs in string annotations (#27963)
• Fix stack overflow in recursive TypedDict dictionary compatibility (#27951)
• Handle assignment expressions in string annotations (#27921)
• Handle dynamic classes in string annotations (#27883)
• Preserve string annotation context in lambda defaults and TypedDict types (#27914)
• Skip invalid subscript arguments in string annotations (#27917)
• Skip invalid subscript operands in string annotations (#27882)

LSP server

• Add untrustedWorkspace option to the LSP (#27828)
• Add executable discovery to the server command (#27806)
• Handle file-valued workspace folders from Zed (#27836)
• Skip scripts with an invalid PEP 723 configuration (#27505)
• Support pull diagnostics for notebook cells (#27778)

Documentation

• Update mypy/pyright comparison table (#4165)

Diagnostics

• Add an opt-in unsound-assignment rule for variables (#27874)
• Fix variadic signature display (#27869)
• Highlight declarations in invalid-assignment diagnostics (#27872)
• Improve LiteralString suggestions in string annotations (#27931)
• Use invalid-type-form for non-generic class annotations (#27889)

Core type checking

• Add bounded constraint solution projections (#27949)
• Fix invariant gradual tuple materialization ranges (#27946)
• Guard recursive constructor bindings by receiver (#27958)
• Preserve all alternatives in bounded intersections (#27898)
• Preserve keyword safety for unpacked callables (#27517)
• Preserve source protocol members and classify finite aliases (#27772)
• Preserve type-variable order when reloading constraints (#27904)
• Propagate narrowing through statically known branches (#27752)
• Recognize ABC metaclass methods on protocols (#27897)
• Support __slots__ (#27730)

Performance

• Lazily infer function parameter default types (#27857)
• Optimize inherited recursive protocol comparisons (#27922)
• Traverse shared constraint source-order nodes once (#27947)

Contributors

• @carljm
• @lerebear
• @charliermarsh
• @dhruvmanila
• @AlexWaygood
• @MichaReiser
• @jelle-openai

Install ty 0.0.74

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.74/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.74/ty-installer.ps1 | iex"

Download ty 0.0.74

Verifying GitHub Artifact Attestations

The artifacts in this release have attestations generated with GitHub Artifact Attestations. These can be verified by using the GitHub CLI:

gh attestation verify <file-path of downloaded artifact> --repo astral-sh/ty

You can also download the attestation from GitHub and verify against that directly:

gh attestation verify <file-path of downloaded artifact> --bundle <file-path of downloaded attestation>