diff --git a/homeassistant/auth/mfa_modules/notify.py b/homeassistant/auth/mfa_modules/notify.py
index 464ce495050..1de6c38aecf 100644
--- a/homeassistant/auth/mfa_modules/notify.py
+++ b/homeassistant/auth/mfa_modules/notify.py
@@ -320,6 +320,7 @@ class NotifySetupFlow(SetupFlow):
         errors: dict[str, str] = {}
 
         hass = self._auth_module.hass
+        assert self._secret and self._count
         if user_input:
             verified = await hass.async_add_executor_job(
                 _verify_otp, self._secret, user_input["code"], self._count
@@ -334,7 +335,6 @@ class NotifySetupFlow(SetupFlow):
             errors["base"] = "invalid_code"
 
         # generate code every time, no retry logic
-        assert self._secret and self._count
         code = await hass.async_add_executor_job(
             _generate_otp, self._secret, self._count
         )
diff --git a/homeassistant/components/http/static.py b/homeassistant/components/http/static.py
index e5e84ca141d..c4dc97727a9 100644
--- a/homeassistant/components/http/static.py
+++ b/homeassistant/components/http/static.py
@@ -23,7 +23,7 @@ PATH_CACHE = LRU(512)
 
 
 def _get_file_path(
-    filename: str, directory: Path, follow_symlinks: bool
+    filename: str | Path, directory: Path, follow_symlinks: bool
 ) -> Path | None:
     filepath = directory.joinpath(filename).resolve()
     if not follow_symlinks:
diff --git a/homeassistant/config.py b/homeassistant/config.py
index 5c870918231..91f94bbbf40 100644
--- a/homeassistant/config.py
+++ b/homeassistant/config.py
@@ -286,6 +286,7 @@ async def async_create_default_config(hass: HomeAssistant) -> bool:
 
     Return if creation was successful.
     """
+    assert hass.config.config_dir
     return await hass.async_add_executor_job(
         _write_default_config, hass.config.config_dir
     )
diff --git a/homeassistant/helpers/event.py b/homeassistant/helpers/event.py
index 85cd684fca1..d18af953ec6 100644
--- a/homeassistant/helpers/event.py
+++ b/homeassistant/helpers/event.py
@@ -141,7 +141,7 @@ def threaded_listener_factory(
 def async_track_state_change(
     hass: HomeAssistant,
     entity_ids: str | Iterable[str],
-    action: Callable[[str, State, State], Awaitable[None] | None],
+    action: Callable[[str, State | None, State], Awaitable[None] | None],
     from_state: None | str | Iterable[str] = None,
     to_state: None | str | Iterable[str] = None,
 ) -> CALLBACK_TYPE:
@@ -197,9 +197,9 @@ def async_track_state_change(
         """Handle specific state changes."""
         hass.async_run_hass_job(
             job,
-            event.data.get("entity_id"),
+            event.data["entity_id"],
             event.data.get("old_state"),
-            event.data.get("new_state"),
+            event.data["new_state"],
         )
 
     @callback