Add strict typing to Skybell (#79800)

.strict-typing

@@ -232,6 +232,7 @@ homeassistant.components.sensor.*
 homeassistant.components.senz.*
 homeassistant.components.shelly.*
 homeassistant.components.simplisafe.*
+homeassistant.components.skybell.*
 homeassistant.components.slack.*
 homeassistant.components.sleepiq.*
 homeassistant.components.smhi.*

homeassistant/components/skybell/sensor.py

@@ -3,7 +3,7 @@ from __future__ import annotations
 
 from collections.abc import Callable
 from dataclasses import dataclass
-from typing import Any
+from datetime import datetime
 
 from aioskybell import SkybellDevice
 from aioskybell.helpers import const as CONST
@@ -17,15 +17,23 @@ from homeassistant.config_entries import ConfigEntry
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity import EntityCategory
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.typing import StateType
 
 from .entity import DOMAIN, SkybellEntity
 
 
 @dataclass
-class SkybellSensorEntityDescription(SensorEntityDescription):
-    """Class to describe a Skybell sensor."""
+class SkybellSensorEntityDescriptionMixIn:
+    """Mixin for Skybell sensor."""
 
-    value_fn: Callable[[SkybellDevice], Any] = lambda val: val
+    value_fn: Callable[[SkybellDevice], StateType | datetime]
+
+
+@dataclass
+class SkybellSensorEntityDescription(
+    SensorEntityDescription, SkybellSensorEntityDescriptionMixIn
+):
+    """Class to describe a Skybell sensor."""
 
 
 SENSOR_TYPES: tuple[SkybellSensorEntityDescription, ...] = (
@@ -110,6 +118,6 @@ class SkybellSensor(SkybellEntity, SensorEntity):
     entity_description: SkybellSensorEntityDescription
 
     @property
-    def native_value(self) -> int:
+    def native_value(self) -> StateType | datetime:
         """Return the state of the sensor."""
         return self.entity_description.value_fn(self._device)

mypy.ini

@@ -2072,6 +2072,16 @@ disallow_untyped_defs = true
 warn_return_any = true
 warn_unreachable = true
 
+[mypy-homeassistant.components.skybell.*]
+check_untyped_defs = true
+disallow_incomplete_defs = true
+disallow_subclassing_any = true
+disallow_untyped_calls = true
+disallow_untyped_decorators = true
+disallow_untyped_defs = true
+warn_return_any = true
+warn_unreachable = true
+
 [mypy-homeassistant.components.slack.*]
 check_untyped_defs = true
 disallow_incomplete_defs = true