Add comply-typing, start working toward PR #628

CHANGELOG.md

@@ -31,6 +31,9 @@ Misc:
 - `[docker]` Base official Docker image on Python 3.12
 - `[utils.version]` Resolve deprecated `datetime.utcfromtimestamp()`
     - [Issue #661](https://github.com/datafolklabs/cement/issues/661)
+- `[dev]` Add `comply-typing` to make helpers, start working toward typing.
+    - [Issue #599](https://github.com/datafolklabs/cement/issues/661)
+    - [PR #628](https://github.com/datafolklabs/cement/pull/628)
 
 
 Deprecations:

Makefile

@@ -34,6 +34,9 @@ comply:
 comply-fix:
 	autopep8 -ri cement/ tests/
 
+comply-typing:
+	mypy ./cement
+
 docs:
 	python setup.py build_sphinx
 	@echo

requirements-dev.txt

@@ -15,6 +15,7 @@ mock
 twine>=1.11.0
 setuptools>=38.6.0
 wheel>=0.31.0
+mypy
 
 # Required for optional extensions
 pystache

setup.cfg

@@ -8,3 +8,22 @@ python_files=test_*.py
 
 [flake8]
 exclude = .git,cement/cli/templates,cement/cli/contrib
+
+[mypy]
+exclude = (?x)(
+    ^cement/cli/templates |
+    ^cement/cli/contrib |
+    ^.git/ |
+    ^tests
+  )
+
+; https://mypy.readthedocs.io/en/stable/config_file.html#untyped-definitions-and-calls
+disallow_untyped_calls = True
+disallow_untyped_defs = True
+disallow_incomplete_defs = True
+check_untyped_defs = True
+disallow_untyped_decorators = True
+
+; https://mypy.readthedocs.io/en/stable/config_file.html#none-and-optional-handling
+no_implicit_optional = True
+strict_optional = True