ty Files

Release Notes

Released on 2026-07-07.

Bug fixes

• Detect async generator expressions containing await (#26568)
• Preserve exhaustive gradual match patterns (#26523)

LSP server

• Fix selection range behavior for strings (#26532)
• Recognize that dedent ends doctest block when parsing docstrings for signature help (#26552)
• Render reStructuredText hyperlinks as Markdown in hover docstrings (#25907)
• Update __slots__ string when renaming an attribute (#26438)

Documentation

• Document PYTHONPATH support in module discovery (#3889)

Library support

• Add support for extra arguments in Pydantic model constructors (#26520)
• Detect Pydantic model configurations (#26573)
• Distinguish lax and strict mode for Pydantic models (#26587)

Core type checking

• Fix subtyping/assignability for @property protocol members (#25332)
• Narrow isinstance against intersections containing invalid member (#26545)
• Narrow match subjects through structural patterns (#25942)
• Preserve generic functools.partial signatures (#24583)
• Preserve generic variadic callback semantics (#26521)
• Preserve invariant materialization on generic specializations (#26578)
• Preserve literal enum member names (#26592)

Performance

• Avoid exponential invariant constraint paths (#26538)
• Batch parallel jobs when finding references (#26534)
• Build module names directly in CompactString (#26546)
• Elide default use-def state (#26398)
• Reuse owned buffers for string literals (#26547)
• Use ICF for macOS release builds (#3709)
• Use cached class literal lookup for is_subclass_of (#26585)

Contributors

• @sharkdp
• @fenghourun
• @zaniebot
• @charliermarsh
• @MichaReiser
• @shaanmajid
• @jvdillon
• @sqqueak
• @SuryanshSS1011
• @carljm
• @lerebear

Install ty 0.0.57

Install prebuilt binaries via shell script

:::sh
curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.57/ty-installer.sh | sh

Install prebuilt binaries via powershell script

:::sh
powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.57/ty-installer.ps1 | iex"

Download ty 0.0.57

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:

:::sh
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:

:::sh
gh attestation verify <file-path of downloaded artifact> --bundle <file-path of downloaded attestation>