add: mypy configuraion

.github/workflows/unit-test.yml

@@ -28,14 +28,13 @@ jobs:
         pip install '.[dev]'
     - name: Lint with flake8
       run: |
-        # stop the build if there are Python syntax errors or undefined names
         flake8 . --count --show-source --statistics
     - name: Lint with black
       run: |
         black . --check --diff
-    # - name: Static type test with mypy
-    #   run: |
-    #     mypy
+    - name: Static type test with mypy
+      run: |
+        mypy
     - name: Test with pytest
       run: |
         pytest

setup.cfg

@@ -65,3 +65,9 @@ profile = black
 indent-size = 4
 max-line-length = 88
 extend-ignore = E203,W503,E501,W605
+
+[mypy]
+python_version = 3.9
+show_error_codes = True
+pretty = True
+strict = True