Add mypy to GitLab CI

.gitlab-ci.yml

@@ -1,6 +1,14 @@
 image: python:3.8-bullseye
 
-test:
+test:mypy:
+  script:
+      - cp config.yaml.example config.yaml
+      - apt update && apt install build-essential
+      - pip install -r requirements.txt --quiet
+      - pip install -r requirements-types.txt --quiet
+      - mypy app
+
+test:docs:
   stage: test
   script:
   - cp config.yaml.example config.yaml

mypy.ini

@@ -0,0 +1,27 @@
+[mypy]
+; Ensure full coverage
+disallow_untyped_calls = True
+disallow_untyped_defs = True
+disallow_incomplete_defs = True
+disallow_untyped_decorators = True
+check_untyped_defs = True
+
+; Restrict dynamic typing
+disallow_any_generics = True
+disallow_subclassing_any = True
+warn_return_any = True
+
+; Know exactly what you're doing
+warn_redundant_casts = True
+warn_unused_ignores = True
+warn_unused_configs = True
+warn_unreachable = True
+show_error_codes = True
+
+; Explicit is better than implicit
+no_implicit_optional = True
+
+; Some libraries don't have hints yet
+ignore_missing_imports = True
+follow_imports = silent
+

requirements-types.txt

@@ -0,0 +1,4 @@
+mypy
+types-requests
+types-PyYAML
+types-python-dateutil