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fix mypy caching #521

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fix mypy caching #521

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ci: cache mypy incremental state in the backend type check job
corrin Aug 2, 2026
b126a76
Merge pull request #520 from corrin/ci-mypy-incremental-cache
corrin Aug 2, 2026
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12 changes: 12 additions & 0 deletions .github/workflows/ci.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -140,6 +140,18 @@ jobs:
key: poetry-${{ hashFiles('poetry.lock') }}
restore-keys: poetry-

# Mypy is incremental: with a restored .mypy_cache it only re-checks
# modules whose dependencies changed. The key includes the commit SHA so
# every run saves a fresh snapshot (actions/cache never overwrites an
# existing key); restore-keys falls back to the most recent snapshot for
# the same deps/config.
- name: Cache mypy incremental state
uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9
with:
path: .mypy_cache
key: mypy-${{ hashFiles('poetry.lock', 'pyproject.toml') }}-${{ github.sha }}
restore-keys: mypy-${{ hashFiles('poetry.lock', 'pyproject.toml') }}-

- name: Install dependencies
run: |
python -m pip install --upgrade pip
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