ty 0.0.35

on Python PyPI

Release Notes

Released on 2026-05-10.

Bug fixes

• Allow ParamSpec specialization through unioned generic classes (#24826)
• Fix cross-file find-references for keyword arguments (#25043)
• Fix comparison between negative and positive literal integers (#25023)
• Reject dataclass decorator parameters based on supported Python version (#25029)

LSP server

• Adjust start of block folding range to preserve visible header for character-precise LSP clients. (#24917)
• Emit folding ranges from the language server for multi-line block headers. (#24978)
• Skip global search for references if identifier is not externally visible (#25033)
• Speed-up find-references by using multithreading for cross-file searches (#25042)

CLI

• Include severity in JUnit diagnostics (#25080)

Core type checking

• Check non-generic overload implementations (#24936)
• Expand support for narrowing within walruses (#24968)
• Filter overloads based on return type for ParamSpec mapping (#24769)
• Improve support for recursive types (#24773)
• Include TypedDict type context when inferring mixed constructors (#25039)
• Include TypedDict type context when inferring string keys (#25037)
• Preserve NewType and TypeAliasType in implicit aliases (#25072)
• Provide type cntext for generator expression yields (#25069)
• Provide type context for boolean operands (#25070)
• Selectively promote a union of homogeneous fixed-length tuples to a single variadic tuple (#24705)
• Support narrowing on __class__ checks (#24997)
• Use more precise exception types when catching a union (#25076)

Diagnostics

• Include error context for overload consistency diagnostics (#24950)

Performance

• Cache results in desperate module resolution (#24977)
• Lazily initialize builder when transforming a union type (#24929)
• Project reachability constraints before narrowing (#24982)
• Skip parameter accumulation for object variadics (#24976)

Contributors

• @MichaReiser
• @mtshiba
• @dylwil3
• @lerebear
• @carljm
• @charliermarsh
• @dhruvmanila

Install ty 0.0.35

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.35/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.35/ty-installer.ps1 | iex"

Download ty 0.0.35

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>