ty 0.0.41

on Python PyPI

Release Notes

Released on 2026-05-31.

Bug fixes

• Avoid panic for deferred dataclass field annotations (#25444)
• Avoid panic from cycle in function decorator inference (#25475)
• Ignore rejected assignments for synthesized bindings (#25340)
• Infer bool for not applied to dynamic values (#25445)
• Use diagnostic message as tie-breaker when sorting (#25424)

LSP server

• Add call hierarchy support (#25338)
• Add function parentheses completion (#25305)
• Display docs for matching parameter when hovering over the name of an argument passed by keyword (#25283)
• Document completeFunctionParentheses editor setting (#3513)

Diagnostics

• Introduce opt-in missing-override-decorator rule (#25111)
• Improve diagnostics for syntax errors in forward annotations (#25158)
• Improve diagnostic for failed assignment to a Callable type (#25308)

Core type checking

• Narrow bound method overloads by receiver (#24707)
• Add disjointness for protocol method members (#25315)
• Avoid treating metaclass declarations as populated values (#25432)
• Use TypeForm in ty_extensions (#25421)

Performance

• Avoid storing redundant reachability indexes (#25453)
• Compact retained semantic arrays (#25454)
• Remove excess capacity from more Salsa cached collections (#25411)
• Use compact sets for more immutable fields (#25476)
• Use ThinVec for sparse kwargs bindings (#25457)

Contributors

• @sharkdp
• @charliermarsh
• @lerebear
• @AlexWaygood
• @MichaReiser
• @mhuen
• @jelle-openai

Install ty 0.0.41

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.41/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.41/ty-installer.ps1 | iex"

Download ty 0.0.41

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>