ty 0.0.55

on Python PyPI

Release Notes

Released on 2026-06-26.

LSP server

• Render full diagnostics in color (#26384)

Documentation

• Document colored diagnostic output (#3858)

Performance

• Improve vendored filesystem concurrency (#26408)
• Optimize enum comparisons in equality evaluation (#26340)
• Remove redundant semantic index shrinks (#26392)
• Use never-change durability for one-shot checks (#26359)

Core type checking

• Correct enum alias detection and scalar constructors (#26345)
• Fix structural pattern binding inference (#26411)
• Improve variable-length tuple slicing (#26151)
• Infer class and mapping pattern bindings (#25941)
• Infer empty collection constructors from later uses (#26389)
• Skip shadowed submodule bindings during import analysis (#26385)
• Sync vendored typeshed stubs (#26406). Typeshed diff
• Track literal iterable emptiness for reachability (#25222)
• Validate positional class patterns against __match_args__ (#26195)

Contributors

• @charliermarsh
• @carljm
• @AlexWaygood
• @MichaReiser
• @mtshiba
• @felixscherz

Install ty 0.0.55

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.55/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.55/ty-installer.ps1 | iex"

Download ty 0.0.55

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>