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@astral-automations-bot astral-automations-bot released this 16 Oct 10:36
Immutable release. Only release title and notes can be modified.
0.0.89
82b0fd4
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Learn about vigilant mode.

Release Notes

Released on 2026-10-16.

Core type checking

  • Added support for return type inference for unannotated functions and methods (#29253).

    Return type inference is currently disabled by default. Enable it with the analysis.return-type-inference setting in pyproject.toml:

    [tool.ty.analysis]
return-type-inference = "always"

    Or in ty.toml:

    [analysis]
return-type-inference = "always"

    Please share your feedback, especially any problems you encounter, in the return type inference feedback issue.

  • Sync vendored typeshed stubs (#29402). Typeshed diff

Bug fixes

  • Avoid a panic when negating dynamic type aliases (#29427)
  • Widen tuple literal lengths when other collection elements contain nested tuple types (#29147)
  • Report invalid Generic and Protocol arguments containing nested variadic type variables (#29146)

Performance

  • Speed up generic class-pattern narrowing by skipping impossible intersection comparisons (#29240)

Contributors

Install ty 0.0.89

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.89/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.89/ty-installer.ps1 | iex"

Download ty 0.0.89

File Platform Checksum
ty-aarch64-apple-darwin.tar.gz Apple Silicon macOS checksum
ty-x86_64-apple-darwin.tar.gz Intel macOS checksum
ty-aarch64-pc-windows-msvc.zip ARM64 Windows checksum
ty-i686-pc-windows-msvc.zip x86 Windows checksum
ty-x86_64-pc-windows-msvc.zip x64 Windows checksum
ty-aarch64-unknown-linux-gnu.tar.gz ARM64 Linux checksum
ty-i686-unknown-linux-gnu.tar.gz x86 Linux checksum
ty-powerpc64le-unknown-linux-gnu.tar.gz PPC64LE Linux checksum
ty-riscv64gc-unknown-linux-gnu.tar.gz RISCV Linux checksum
ty-s390x-unknown-linux-gnu.tar.gz S390x Linux checksum
ty-x86_64-unknown-linux-gnu.tar.gz x64 Linux checksum
ty-armv7-unknown-linux-gnueabihf.tar.gz ARMv7 Linux checksum
ty-aarch64-unknown-linux-musl.tar.gz ARM64 MUSL Linux checksum
ty-i686-unknown-linux-musl.tar.gz x86 MUSL Linux checksum
ty-x86_64-unknown-linux-musl.tar.gz x64 MUSL Linux checksum
ty-arm-unknown-linux-musleabihf.tar.gz ARMv6 MUSL Linux (Hardfloat) checksum
ty-armv7-unknown-linux-musleabihf.tar.gz ARMv7 MUSL Linux checksum

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>
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