Add py.typed file, check types against mypy in CI

oprypin · copybara-github · commit ad94b79288e2 · 2024-07-01T04:07:07.000-07:00
Note that the `py.typed` file will be automatically picked up into the whl package, due to `setup.py` already containing `include_package_data=True`.

PiperOrigin-RevId: 648318479
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
@@ -54,3 +54,22 @@ jobs:
         with:
           name: bazel-testlogs-${{ matrix.os }}-${{ matrix.python-version }}
           path: ci-artifacts
+
+  checks:
+    if:
+      github.event_name == 'push' || github.event.pull_request.head.repo.full_name !=
+      github.repository
+
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - name: Install dependencies
+        run: pip install -U mypy
+
+      - name: Check types with mypy
+        run: mypy absl
diff --git a/README.md b/README.md
@@ -38,6 +38,13 @@ cd abseil-py
 bazel test absl/...
 ```
 
+Please also validate the type annotations against the latest mypy:
+
+```bash
+pip install mypy
+mypy absl
+```
+
 ### Example Code
 
 Please refer to
diff --git a/absl/py.typed b/absl/py.typed
