diff --git a/public/__init__.py b/public/__init__.py
index 1debde5485..493110db57 100644
--- a/public/__init__.py
+++ b/public/__init__.py
@@ -2,6 +2,6 @@
 from pathlib import Path
 
 
-def where():
+def where() -> Path:
     """Return path to the frontend."""
     return Path(__file__).parent
diff --git a/public/py.typed b/public/py.typed
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/setup.cfg b/setup.cfg
index f3efcd2597..3690791245 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -19,3 +19,8 @@ python_requires = >= 3.4.0
 [options.packages.find]
 include =
     hass_frontend*
+
+[mypy]
+python_version = 3.4
+show_error_codes = True
+strict = True