ty Files

Release Notes

Released on 2026-07-15.

Bug fixes

• Expand transparent callable workaround with overloads and Awaitable[T] (#26761)
• Separate type-mapping caches by transformation mode (#26857)
• Avoid recursive protocol union redundancy checks (#26689)
• Handle recursive protocols in redundant-cast checks (#26708)

LSP server

• Prevent type that is written with a code span from being incorrectly re-wrapped during docstring Markdown rendering (#26723)

Library support

• Pydantic: Support populate_by_name and custom initializers (#26764)
• Pydantic: Warn about immediately discarded extra arguments (#26762)

Diagnostics

• Narrow TypeGuard keyword arguments and remove invalid-type-guard-call (#26809)
• Support own-line suppression comments (#26785)

Core type checking

• Derive descriptor setter domains for protocols (#26683)
• Handle cycles in derived constraint relations (#26814)
• Implement unified generic call inference (#26141)
• Preserve constraints from bound receivers (#26776)
• Project exact-length narrowing through TypeVars (#26852)
• Resolve PEP 695 aliases in type[...] annotations (#26842)
• Retain sequence pattern narrowing in successful match cases (#26807)
• Support class and static protocol methods (#26574)
• Support class objects satisfying instance-method protocols (#26789)
• Support type[Protocol] (#26649)
• Sync vendored typeshed stubs (#26840). Typeshed diff
• Treat transparent callable decorators consistently in class assignments (#26720)

Performance

• Compare overloaded protocol method returns pairwise (#26684)
• Extend PathBounds fast-path to support both upper and lower bounds (#26782)
• Skip Self type scans for non-generic instances (#26703)

Contributors

• @sharkdp
• @mtshiba
• @dhruvmanila
• @lerebear
• @carljm
• @charliermarsh
• @ibraheemdev
• @RasmusNygren

Install ty 0.0.60

Install prebuilt binaries via shell script

:::sh
curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.60/ty-installer.sh | sh

Install prebuilt binaries via powershell script

:::sh
powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.60/ty-installer.ps1 | iex"

Download ty 0.0.60

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>