ty 0.0.76

on Python PyPI

Release Notes

Released on 2026-08-31.

Preview features

• Add a missing-direct-dependency rule (#28001)
• Cancel superseded queued uv requests (#28108)
• Check direct dependencies in PEP 723 scripts (#28136)
• Fix Goto definition in script dependencies (#27747)
• Move script environment initialization to the CLI and LSP (#28038)
• Refresh uv project metadata in the background (#27933)
• Synchronize PEP 723 script environments in the language server (#27619)
• Warn when uv metadata cannot support dependency checks (#28133)

Bug fixes

• Avoid panics on incomplete protocol type parameter lists (#28088)
• Fix auto-completion panic involving bare declarations (#28191)
• Guard recursive meta-type expansion (#28143)
• Preserve parentheses when removing redundant casts (#28092)

LSP server

• Add "Find references" support for pytest fixtures (#28075)
• Highlight PEP 723 script metadata as TOML (#27746)
• Synchronize saved script metadata on open (#27873)

Core type checking

• Apply mixin specialization when validating enum members (#28101)
• Bind Self through generic type aliases (#28117)
• Infer lambda parameters through callable type aliases (#28109)
• Intersection simplifications with subtype-related generic specializations (#26880)
• Invalidate member narrowing across loop iterations (#28009)
• Narrow functional enum members in == and match (#28103)
• Only treat recursive types with unbounded specializations as fallback cycles (#27538)
• Preserve Final variance in stubs (#28119)
• Preserve inferred types for unknown class-decorator results (#28067)
• Preserve list literal positions in starred unpacking (#28061)
• Preserve short-circuit reachability for direct conditions (#28082)
• Preserve type variables in bounded generic defaults (#28122)
• Reject circular type alias definitions (#28140)
• Reject class access to generic instance attributes (#28123)
• Use the subclass receiver when checking method overrides (#28124)
• Validate declared variance in method signatures (#28116)

Performance

• Avoid cubic narrowing with repeated assignments and context managers (#27787)
• Avoid repeated traversal of shared alias arguments (#28147)
• Reject impossible eager protocol comparisons early (#28081)

Contributors

• @AlexWaygood
• @MichaReiser
• @charliermarsh
• @BitWeaverDev
• @gorewilliams
• @zsol
• @malkin0xb8
• @sharkdp
• @mtshiba
• @carljm
• @lerebear
• @jamtat

Install ty 0.0.76

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.76/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.76/ty-installer.ps1 | iex"

Download ty 0.0.76

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>