ty 0.0.66

on Python PyPI

Release Notes

Released on 2026-08-03.

LSP server

• Index with-statement targets as symbols (#27256)
• Trigger signature help after completing callable with parentheses (#27084)

Library support

• Pydantic: Recognize models installed on extra search paths (#27429)

Diagnostics

• Detect __aenter__ and __aexit__ that do not return awaitables (#27414)
• Diagnose dataclass fields after inherited defaults (#27327)
• Emit diagnostic when specializing a non-generic class (#26883)
• Improve error context for incompatible callable signatures (#27422)
• Preserve forwarded expanded-variadic diagnostic sources (#27266)

Core type checking

• Avoid over-materializing user-defined TypeIs return types (#26864)
• Fix enum class container assignability (#27318)
• Hide stub-only helpers from implicit builtin lookup (#27423)
• Move Unknown out of the experimental ty_extensions API (#27430)
• Preserve TypeVarTuple context during Generic recovery (#27381)
• Preserve exact numeric types in covariant collections (#27311)
• Reject ClassVar and Final qualifiers in NamedTuple fields (#27380)
• Reject out-of-scope ParamSpec components (#27378)
• Reject specializing non-generic subclasses (#27377)
• Respect bounds and constraints in generic materializations (#27228)
• Sync vendored typeshed stubs (#27401). Typeshed diff

Contributors

• @dhruvmanila
• @carljm
• @Punisheroot
• @AlexWaygood
• @cheparity
• @BitWeaverDev
• @charliermarsh
• @ribru17
• @sharkdp

Install ty 0.0.66

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.66/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.66/ty-installer.ps1 | iex"

Download ty 0.0.66

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>