chore(deps): update dependency ty to v0.0.42

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
ty (changelog)	==0.0.40 → ==0.0.42

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Release Notes

astral-sh/ty (ty)

v0.0.42

Compare Source

Released on 2026-06-01.

Bug fixes

• Fix narrowing of enum literal unions by member identity (#​25520)
• Detect recursive expansion in constraint-set solving (#​25442)

Core type checking

• Support tagged-union narrowing for nominal types (#​24916)
• Extend Generator assignability workaround to Python 3.13+ (#​25472)
• Sync vendored typeshed stubs (#​25514)

Performance

• Avoid redundant work for empty collection context (#​25527)
• Deduplicate retained use-def place states (#​25450)
• Compact retained semantic maps (#​25238)

Contributors

• @​aholyoke
• @​carljm
• @​charliermarsh
• @​sharkdp

v0.0.41

Compare Source

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

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.92%. Comparing base (0e62849) to head (488020e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1621   +/-   ##
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  Coverage   99.92%   99.92%           
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  Files          37       37           
  Lines        1333     1333           
  Branches       71       71           
=======================================
  Hits         1332     1332           
  Partials        1        1           

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