Run mypy in strict mode

editor/__init__.py

@@ -59,12 +59,12 @@
 EDITORS = {'Windows': 'notepad'}
 
 
-@xmod.xmod(mutable=True)
+@xmod.xmod(mutable=True)  # type: ignore[misc]
 def editor(
     text: t.Optional[str] = None,
     filename: t.Union[None, Path, str] = None,
     editor: t.Optional[str] = None,
-    **kwargs: t.Mapping,
+    **kwargs: t.Any,
 ) -> str:
     """
     Open a text editor, block while the user edits, then return the results
@@ -115,6 +115,5 @@ def default_editor() -> str:
     `'notepad'`, otherwise `'vim'`.
     """
     return os.environ.get('VISUAL') or (
-        os.environ.get('EDITOR')
-        or EDITORS.get(platform.system(), DEFAULT_EDITOR)
+        os.environ.get('EDITOR') or EDITORS.get(platform.system(), DEFAULT_EDITOR)
     )

pyproject.toml

@@ -46,6 +46,9 @@ line-length = 88
 
 [tool.ruff.format]
 quote-style = "single"
+
+[tool.mypy]
+strict = true
 [build-system]
 requires = ["poetry-core"]
 build-backend = "poetry.core.masonry.api"

test_editor.py

@@ -1,5 +1,5 @@
-from pathlib import Path
 import unittest
+from pathlib import Path
 from unittest import mock
 
 import tdir