astral-sh/ty 0.0.34

on GitHub

Release Notes

Released on 2026-05-01.

Bug fixes

• Avoid panic in recursive protocol signature comparisons (#24665)
• Avoid panics for syntax error targets in invalid unpacking assignments (#24663)
• Fix unbounded type growth in nested-typevar substitutions (#24803)
• Prevent string annotation tokens from leaking across notebook cells (#24919)
• Support reference finding in stringified annotations (#24956)

LSP server

• Add hover support for PEP 695 type aliases (#24926)
• Offer string literal completion suggestions based on expected type (#24555)
• Support Go-to Definition, Go-To Declaration, and Find References for TypedDict and NamedTuple initializers (#24897)
• Support Annotated metadata in semantic tokens (#24890)

Core type checking

• Add support for functools.partial (#24582)
• Fix ParamSpec defaults and alias variance (#24479)
• Fix TypeIs assignability with gradual types (#24928)
• Infer dict(**TypedDict) in TypedDict context (#24709)
• Support infer_variance for legacy TypeVar (#24930)
• Support variance keywords in ParamSpec (#24927)
• Sync vendored typeshed stubs (#24952). Typeshed diff
• Unpack Union of TypedDict in various sites (#24958)

Diagnostics

• Add missing error context node for protocol to protocol assignability (#24905)
• Show a diagnostic for unsupported inferred Python version (#24581)

Performance

• Lazily build TypeVar accumulations (#24782)

Contributors

• @sharkdp
• @MichaReiser
• @lerebear
• @MatthewMckee4
• @charliermarsh
• @mtshiba
• @Minibrams
• @denyszhak

Install ty 0.0.34

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.34/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.34/ty-installer.ps1 | iex"

Download ty 0.0.34

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>