Better typing (#394)

* Add py.typed and mypy CI

* Add py.typed and mypy CI

Remove mypy from pre-commit

* remove CI trigger

* fix syntax

* Add path

* Add lxml

* Add to env file so its cached

* Move to pyproject.toml

* Small fixes

* [WIP]

* str -> Hashable

* Remove deprecated functions

* [WIP]

* Almost there.

* Done!

* fix test.

* More fixes

* Silence renaming warning

* Fix tests

* Silence pytest warnings

* Add tests with tuple, fix curvefit

* Fix rename_like

* More fixes

Author: dcherian

.github/workflows/ci.yaml

@@ -122,3 +122,41 @@ jobs:
         shell: bash -l {0}
         run: |
           pytest -n 2
+
+  mypy:
+    name: mypy
+    runs-on: "ubuntu-latest"
+    defaults:
+      run:
+        shell: bash -l {0}
+    env:
+      PYTHON_VERSION: "3.10"
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0 # Fetch all history for all branches and tags.
+      - name: Set up conda environment
+        uses: mamba-org/provision-with-micromamba@v14
+        with:
+          environment-file: ci/environment.yml
+          environment-name: cf_xarray_test
+          cache-env: true
+          extra-specs: |
+            python="${{ env.PYTHON_VERSION }}"
+      - name: Install cf_xarray
+        run: |
+          python -m pip install --no-deps -e .
+      - name: Install mypy
+        run: |
+          python -m pip install 'mypy'
+      - name: Run mypy
+        run: |
+          python -m mypy --install-types --non-interactive --cobertura-xml-report mypy_report cf_xarray/
+      - name: Upload mypy coverage to Codecov
+        uses: codecov/[email protected]
+        with:
+          file: mypy_report/cobertura.xml
+          flags: mypy
+          env_vars: PYTHON_VERSION
+          name: codecov-umbrella
+          fail_ci_if_error: false

.pre-commit-config.yaml

@@ -18,12 +18,6 @@ repos:
     hooks:
       - id: flake8
 
-  - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.991
-    hooks:
-       - id: mypy
-         additional_dependencies: [types-all]
-
   - repo: https://github.com/rstcheck/rstcheck
     rev: v6.1.1
     hooks: