ty 0.0.45

on Python PyPI

Release Notes

Released on 2026-06-08.

Bug fixes

• Avoid treating dynamic class attributes as instance attributes (#25678)
• Fix divergence in recursive inference due to ambiguous overload (#25548)
• Preserve literal promotion for mixed bounds (#25648)

Diagnostics

• Add missing-type-argument lint rule (#25617)

Core type checking

• Add support for narrowing on tuple match cases (#25493)
• Check implicit open TypedDict extra items (#25628)
• Create fresh copies of generic callable typevars (#24949)
• Preserve deprecation on replacement functions (#25688)
• Preserve intersection receivers during attribute lookup (#25626)
• Preserve transparent callable decorators (#25030)

Performance

• Avoid AST load for callable description names (#25728)
• Avoid caching absent class decorators and type parameters (#25689)
• Avoid caching atomic type specializations (#25663)
• Avoid caching constant constraint relations (#25656)
• Avoid caching missing implicit attributes (#25649)
• Avoid caching trivial class-header queries (#25692)
• Avoid caching trivial member lookups (#25661)
• Bypass member lookup for module imports (#25723)
• Cache constraint implication checks (#25714)
• Cache upper-bound satisfiability (#25710)
• Compact retained function type signatures (#25669)
• Compact retained use-def bindings (#25682)
• Consolidate retained narrowing constraints (#25660)
• Construct trivial constraint sets directly (#25659)
• Resolve function descriptors directly (#25675)
• Share code-generator classification across specializations (#25701)
• Share parameter lists with Arc (#25735)
• Use same-file expression inference in reachability (#25694)

Contributors

• @mtshiba
• @dhruvmanila
• @charliermarsh
• @dcreager
• @carljm
• @reginaldl

Install ty 0.0.45

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.45/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.45/ty-installer.ps1 | iex"

Download ty 0.0.45

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>