astral-sh/ty 0.0.73

on GitHub

Release Notes

Released on 2026-08-18.

LSP server

• Do not prefer unsafe fixes in the language server (#27822)
• Fix signature help in trailing whitespace (#27784)

Library support

• Preserve variadic generics in functools.partial (#27774)

Diagnostics

• Add an opt-in rule flagging function decorators that transform a non-dynamic type into a dynamic type (#27829)
• Disambiguate same-named types in several diagnostics (#27814)
• Show error spans for errors originating in script metadata (#26693)

Core type checking

• Avoid bypassing solver during literal promotion (#27763)
• Expand nested union aliases when finding a TypedDict or callable (#27740)
• Implement intersection meta-type projection (#27660)
• Infer generic protocols from class objects (#27812)
• Model exception-suppressing context managers (#27219)
• Preserve TypeAliasType runtime origin (#27813)
• Preserve class objects in lazy protocol checks (#27815)
• Preserve declared types in exception handlers (#27817)
• Preserve explicit globals after conditional rebinding (#27786)
• Preserve property subclass types and accessors (#27833)
• Preserve required stub fields in generated constructors (#27765)
• Preserve static upper bounds of gradual solutions (#27664)
• Prevent unrelated quantified constraints from destabilizing recursive queries (#27737)
• Separate generic constraint accumulation from legacy projection (#27743)
• Simplify generic protocol inference (#27819)
• Specialize inherited members of unspecialized generic classes (#27658)
• Specialize type variables determined by bound receivers (#27732)
• Support unpacking tuple type aliases (#27825)
• Sync vendored typeshed stubs (#27771). Typeshed diff

Performance

• Cache py.typed contents (#27805)
• Deduplicate exception checkpoints across equivalent branches (#27703)

Contributors

• @charliermarsh
• @AlexWaygood
• @MichaReiser
• @augustelalande
• @carljm
• @woodruffw
• @dhruvmanila
• @ibraheemdev
• @zaniebot

Install ty 0.0.73

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.73/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.73/ty-installer.ps1 | iex"

Download ty 0.0.73

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>