check mypy

MANIFEST.in

@@ -1,2 +1,3 @@
+include src/django_idom/py.typed
 recursive-include src/django_idom/static *
 recursive-include src/django_idom/templates *.html

noxfile.py

@@ -37,6 +37,7 @@ def test(session: Session) -> None:
     """Run the complete test suite"""
     session.install("--upgrade", "pip", "setuptools", "wheel")
     session.notify("test_suite", posargs=session.posargs)
+    session.notify("test_types")
     session.notify("test_style")
 
 
@@ -60,6 +61,13 @@ def test_suite(session: Session) -> None:
     session.run("python", "manage.py", "test", *posargs)
 
 
+@nox.session
+def test_types(session: Session) -> None:
+    install_requirements_file(session, "check-types")
+    install_requirements_file(session, "pkg-deps")
+    session.run("mypy", "--show-error-codes", "src/django_idom", "tests/test_app")
+
+
 @nox.session
 def test_style(session: Session) -> None:
     """Check that style guidelines are being followed"""

pyproject.toml

@@ -10,3 +10,9 @@ ensure_newline_before_comments = "True"
 include_trailing_comma = "True"
 line_length = 88
 lines_after_imports = 2
+
+[tool.mypy]
+ignore_missing_imports = "True"
+warn_unused_configs = "True"
+warn_redundant_casts = "True"
+warn_unused_ignores = "True"

requirements/check-types.txt

@@ -0,0 +1,2 @@
+mypy
+django-stubs[compatible-mypy]

src/django_idom/http/urls.py

@@ -8,7 +8,7 @@
 urlpatterns = [
     path(
         "web_module/<path:file>",
-        views.web_modules_file,
+        views.web_modules_file,  # type: ignore[arg-type]
         name="web_modules",
     )
 ]

src/django_idom/py.typed

@@ -0,0 +1 @@
+# Marker file for PEP 561

src/django_idom/utils.py

@@ -1,10 +1,11 @@
+from __future__ import annotations
+
 import contextlib
 import logging
 import os
 import re
 from fnmatch import fnmatch
 from importlib import import_module
-from typing import Set
 
 from django.template import engines
 from django.utils.encoding import smart_str
@@ -68,9 +69,9 @@ def _get_loaders(self):
                 loaders.append(loader)
         return loaders
 
-    def _get_paths(self) -> Set:
+    def _get_paths(self) -> set[str]:
         """Obtains a set of all template directories."""
-        paths = set()
+        paths: set[str] = set()
         for loader in self._get_loaders():
             with contextlib.suppress(ImportError, AttributeError, TypeError):
                 module = import_module(loader.__module__)
@@ -80,12 +81,12 @@ def _get_paths(self) -> Set:
                 paths.update(smart_str(origin) for origin in get_template_sources(""))
         return paths
 
-    def _get_templates(self, paths: Set) -> Set:
+    def _get_templates(self, paths: set[str]) -> set[str]:
         """Obtains a set of all HTML template paths."""
         extensions = [".html"]
-        templates = set()
+        templates: set[str] = set()
         for path in paths:
-            for root, dirs, files in os.walk(path, followlinks=False):
+            for root, _, files in os.walk(path, followlinks=False):
                 templates.update(
                     os.path.join(root, name)
                     for name in files
@@ -95,9 +96,9 @@ def _get_templates(self, paths: Set) -> Set:
 
         return templates
 
-    def _get_components(self, templates: Set) -> Set:
+    def _get_components(self, templates: set[str]) -> set[str]:
         """Obtains a set of all IDOM components by parsing HTML templates."""
-        components = set()
+        components: set[str] = set()
         for template in templates:
             with contextlib.suppress(Exception):
                 with open(template, "r", encoding="utf-8") as template_file:
@@ -118,7 +119,7 @@ def _get_components(self, templates: Set) -> Set:
             )
         return components
 
-    def _register_components(self, components: Set) -> None:
+    def _register_components(self, components: set[str]) -> None:
         """Registers all IDOM components in an iterable."""
         for component in components:
             try: