ty 0.0.26

on Python PyPI

Release Notes

Released on 2026-03-26.

Bug fixes

• Prevent "too many cycle iteration" panics in more situations (#24061)
• Fix false positives and false negatives when unpacking a union of tuples into a function call (#23298)

Core type checking

• Add support for typing.Concatenate (#23689)
• Validate the return type of generator functions (#24026)
• Support dataclass field converters (#23088)
• Disallow Self in metaclass and static methods (#23231)
• Improve call inference for keyword-only dict() (#24103)
• Respect non-explicitly defined dataclass_transform params (#24170)
• Unconditionally silence diagnostics in unreachable code (#24179)
• Respect terminal-function-call narrowing in global scope (#23245)

Performance

• Fix performance regression for narrowing on a larger Literal type(#24185)

Contributors

• @sharkdp
• @Glyphack
• @charliermarsh
• @mtshiba
• @dhruvmanila
• @carljm
• @choucavalier

Install ty 0.0.26

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.26/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.26/ty-installer.ps1 | iex"

Download ty 0.0.26

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>