ci: Add mypy checks for runtime & syntax

Author: eemeli

.github/workflows/fluent.runtime.yml

@@ -46,7 +46,6 @@ jobs:
         run: |
           ./runtests.py
   lint:
-    name: flake8
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -58,7 +57,12 @@ jobs:
           python -m pip install wheel
           python -m pip install --upgrade pip
           python -m pip install flake8==6
-      - name: lint
+          python -m pip install mypy==1
+      - name: flake8
         working-directory: ./fluent.runtime
         run: |
           python -m flake8
+      - name: mypy
+        working-directory: ./fluent.runtime
+        run: |
+          python -m mypy fluent/

.github/workflows/fluent.syntax.yml

@@ -39,8 +39,7 @@ jobs:
         working-directory: ./fluent.syntax
         run: |
           ./runtests.py
-  syntax:
-    name: flake8
+  lint:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -51,7 +50,12 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           python -m pip install flake8==6
-      - name: lint
+          python -m pip install mypy==1
+      - name: flake8
         working-directory: ./fluent.syntax
         run: |
           python -m flake8
+      - name: mypy
+        working-directory: ./fluent.syntax
+        run: |
+          python -m mypy fluent/

fluent.runtime/setup.cfg

@@ -12,3 +12,6 @@ max-line-length=120
 line_length=120
 skip_glob=.tox
 not_skip=__init__.py
+
+[mypy]
+strict = True

fluent.syntax/setup.cfg

@@ -12,3 +12,6 @@ max-line-length=120
 line_length=120
 skip_glob=.tox
 not_skip=__init__.py
+
+[mypy]
+strict = True