Bump mypy from 1.18.2 to 1.19.0

[dependabot]

Bumps mypy from 1.18.2 to 1.19.0.

Changelog

Sourced from mypy's changelog.

Mypy Release Notes

Next Release

Drop Support for Python 3.9

Mypy no longer supports running with Python 3.9, which has reached end-of-life. When running mypy with Python 3.10+, it is still possible to type check code that needs to support Python 3.9 with the --python-version 3.9 argument. Support for this will be dropped in the first half of 2026!

Contributed by Marc Mueller (PR 20156).

Mypy 1.19

We’ve just uploaded mypy 1.19.0 to the Python Package Index (PyPI). Mypy is a static type checker for Python. This release includes new features, performance improvements and bug fixes. You can install it as follows:

python3 -m pip install -U mypy

You can read the full documentation for this release on Read the Docs.

Python 3.9 Support Ending Soon

This is the last mypy feature release that supports Python 3.9, which reached end of life in October 2025.

Performance Improvements

• Switch to a more dynamic SCC processing logic (Ivan Levkivskyi, PR 20053)
• Speed up type aliases (Ivan Levkivskyi, PR 19810)

Fixed‑Format Cache Improvements

Mypy uses a cache by default to speed up incremental runs by reusing partial results from earlier runs. Mypy 1.18 added a new binary fixed-format cache representation as an experimental feature. The feature is no longer experimental, and we are planning to enable it by default in a future mypy release (possibly 1.20), since it's faster and uses less space than the original, JSON-based cache format. Use --fixed-format-cache to enable the fixed-format cache.

Mypy now has an extra dependency on the librt PyPI package, as it's needed for cache serialization and deserialization.

Mypy ships with a tool to convert fixed-format cache files to the old JSON format. Example of how to use this:

$ python -m mypy.exportjson .mypy_cache/.../my_module.data.ff

... (truncated)

Commits

• 0f068c9 Remove +dev
• 6d5cf52 Various updates to 1.19 changelog (#20304)
• 3c81308 Add draft version of 1.19 release notes (#20296)
• 1999a20 [mypyc] librt base64: use existing SIMD CPU dispatch by customizing build fla...
• 1b94fbb [mypyc] Fix vtable pointer with inherited dunder new (#20302)
• 13369cb [mypyc] Fix crash on super in generator (#20291)
• a087a58 Update import map when new modules added (#20271)
• 35e843c [mypyc] Add efficient librt.base64.b64decode (#20263)
• 094f66d [mypyc] Add repr to AssignmentTarget subclasses (#20258)
• 0738db3 Do not push partial types to the binder (#20202)
• Additional commits viewable in compare view

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[codspeed-hq]

CodSpeed Performance Report

Merging #11787 will not alter performance

_{Comparing dependabot/pip/mypy-1.19.0 (4f0b12c) with master (1c06a65)¹}

Summary

✅ 59 untouched

Footnotes

1. No successful run was found on master (dc4c573) during the generation of this report, so 1c06a65 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.74%. Comparing base (1c06a65) to head (4f0b12c).
⚠️ Report is 4 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #11787   +/-   ##
=======================================
  Coverage   98.74%   98.74%           
=======================================
  Files         127      127           
  Lines       43823    43823           
  Branches     2332     2332           
=======================================
  Hits        43273    43273           
  Misses        389      389           
  Partials      161      161           

Flag	Coverage Δ
CI-GHA	98.60% <ø> (ø)
OS-Linux	98.34% <ø> (ø)
OS-Windows	96.68% <ø> (ø)
OS-macOS	97.56% <ø> (ø)
Py-3.10.11	97.10% <ø> (+<0.01%)	⬆️
Py-3.10.19	97.60% <ø> (ø)
Py-3.11.14	97.80% <ø> (ø)
Py-3.11.9	97.31% <ø> (-0.01%)	⬇️
Py-3.12.10	97.42% <ø> (+<0.01%)	⬆️
Py-3.12.12	97.90% <ø> (-0.01%)	⬇️
Py-3.13.9	98.15% <ø> (ø)
Py-3.14.0	98.11% <ø> (+<0.01%)	⬆️
Py-3.14.0t	97.18% <ø> (-0.01%)	⬇️
Py-pypy3.11.13-7.3.20	97.40% <ø> (+<0.01%)	⬆️
VM-macos	97.56% <ø> (ø)
VM-ubuntu	98.34% <ø> (ø)
VM-windows	96.68% <ø> (ø)

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