potiuk opened a new pull request, #65326:
URL: https://github.com/apache/airflow/pull/65326
Align local mypy runs with CI by syncing the project virtualenv to
`uv.lock` before mypy executes, and prevent the `update-uv-lock` prek
hook from silently rewriting `uv.lock` during a commit.
## Changes
- **`scripts/ci/prek/mypy_local_folder.py`**: before running mypy
locally, the hook now runs `uv sync --frozen --project <project>` so
the local `.venv` matches the dependency set CI uses. If the sync
fails, mypy is not invoked and the hook exits with a clear error.
The failure message points at the same two-step command
(`uv sync --frozen` + `uv run --frozen ... mypy`).
- **`.pre-commit-config.yaml`**: the `update-uv-lock` hook now runs
`uv lock --frozen` instead of `uv lock`. A pyproject.toml change
that would touch `uv.lock` now fails the hook, forcing contributors
to run `uv lock` explicitly and commit the refreshed lock — keeping
lock updates intentional and reviewable.
- **`AGENTS.md`** and **`contributing-docs/08_static_code_checks.rst`**:
updated the type-check / mypy instructions to document the
`uv sync --frozen --project <PROJECT>` prerequisite and explain why
(otherwise mypy results can diverge from CI).
## Motivation
Running mypy locally without syncing the project venv produces
results that can silently drift from CI, because the local `.venv`
may contain different package versions than `uv.lock` (e.g. after
switching branches, installing extras, or running `uv run` with
different projects). Forcing a `--frozen` sync before mypy makes
local results reproducible and consistent with CI.
Likewise, allowing `uv lock` (without `--frozen`) to silently
rewrite `uv.lock` from a commit hook means lock changes can sneak
into unrelated commits. Failing fast lets contributors decide
when and how to regenerate the lock.
---
##### Was generative AI tooling used to co-author this PR?
- [X] Yes — Claude Opus 4.6 (1M context)
Generated-by: Claude Opus 4.6 (1M context) following [the
guidelines](https://github.com/apache/airflow/blob/main/contributing-docs/05_pull_requests.rst#gen-ai-assisted-contributions)
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