Add a mypy precommit hook

This requires some more stub-missing entries declared in mypy.ini to pass OK.

.pre-commit-config.yaml

@@ -12,6 +12,16 @@ repos:
   hooks:
   - id: codespell
 
+- repo: local
+  hooks:
+  - id: mypy
+    name: mypy
+    entry: mypy
+    args: [swh]
+    pass_filenames: false
+    language: system
+    types: [python]
+
 # unfortunately, we are far from being able to enable this...
 # - repo: https://github.com/PyCQA/pydocstyle.git
 #   rev: 4.0.0

mypy.ini

@@ -5,6 +5,9 @@ warn_unused_ignores = True
 
 # 3rd party libraries without stubs (yet)
 
+[mypy-aiohttp.*]
+ignore_missing_imports = True
+
 [mypy-aiohttp_utils.*]
 ignore_missing_imports = True
 
@@ -23,9 +26,15 @@ ignore_missing_imports = True
 [mypy-django.*]  # false positive, only used my hypotesis' extras
 ignore_missing_imports = True
 
+[mypy-hypothesis.*]
+ignore_missing_imports = True
+
 [mypy-msgpack.*]
 ignore_missing_imports = True
 
+[mypy-multidict.*]
+ignore_missing_imports = True
+
 [mypy-pkg_resources.*]
 ignore_missing_imports = True
 
@@ -38,5 +47,8 @@ ignore_missing_imports = True
 [mypy-requests_mock.*]
 ignore_missing_imports = True
 
+[mypy-setuptools.*]
+ignore_missing_imports = True
+
 [mypy-systemd.*]
 ignore_missing_imports = True