From a14a8c4e432f44d928675140e7f5684e36453cf7 Mon Sep 17 00:00:00 2001
From: epenet <6771947+epenet@users.noreply.github.com>
Date: Thu, 15 Jan 2026 10:38:34 +0100
Subject: [PATCH] Mark last_reset and state_class type hints as compulsory in
 sensor platform (#160982)

---
 homeassistant/components/blebox/sensor.py        | 4 +++-
 homeassistant/components/hue/v1/sensor_base.py   | 2 +-
 homeassistant/components/utility_meter/sensor.py | 2 +-
 pylint/plugins/hass_enforce_type_hints.py        | 3 +++
 4 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/homeassistant/components/blebox/sensor.py b/homeassistant/components/blebox/sensor.py
index 5120a7a3c98..14cddf41e45 100644
--- a/homeassistant/components/blebox/sensor.py
+++ b/homeassistant/components/blebox/sensor.py
@@ -1,5 +1,7 @@
 """BleBox sensor entities."""
 
+from datetime import datetime
+
 import blebox_uniapi.sensor
 
 from homeassistant.components.sensor import (
@@ -146,7 +148,7 @@ class BleBoxSensorEntity(BleBoxEntity[blebox_uniapi.sensor.BaseSensor], SensorEn
         return self._feature.native_value
 
     @property
-    def last_reset(self):
+    def last_reset(self) -> datetime | None:
         """Return the time when the sensor was last reset, if implemented."""
         native_implementation = getattr(self._feature, "last_reset", None)
 
diff --git a/homeassistant/components/hue/v1/sensor_base.py b/homeassistant/components/hue/v1/sensor_base.py
index fb8f3c572c1..0ea079992e0 100644
--- a/homeassistant/components/hue/v1/sensor_base.py
+++ b/homeassistant/components/hue/v1/sensor_base.py
@@ -181,7 +181,7 @@ class GenericHueSensor(GenericHueDevice, entity.Entity):  # pylint: disable=hass
         )
 
     @property
-    def state_class(self):
+    def state_class(self) -> SensorStateClass:
         """Return the state class of this entity, from STATE_CLASSES, if any."""
         return SensorStateClass.MEASUREMENT
 
diff --git a/homeassistant/components/utility_meter/sensor.py b/homeassistant/components/utility_meter/sensor.py
index dd0e62b0dbd..071488dc68b 100644
--- a/homeassistant/components/utility_meter/sensor.py
+++ b/homeassistant/components/utility_meter/sensor.py
@@ -700,7 +700,7 @@ class UtilityMeterSensor(RestoreSensor):
         return None
 
     @property
-    def state_class(self):
+    def state_class(self) -> SensorStateClass:
         """Return the device class of the sensor."""
         return (
             SensorStateClass.TOTAL
diff --git a/pylint/plugins/hass_enforce_type_hints.py b/pylint/plugins/hass_enforce_type_hints.py
index b4f7a5a4a5a..a562ea69d68 100644
--- a/pylint/plugins/hass_enforce_type_hints.py
+++ b/pylint/plugins/hass_enforce_type_hints.py
@@ -700,6 +700,7 @@ _ENTITY_MATCH: list[TypeHintMatch] = [
     TypeHintMatch(
         function_name="device_class",
         return_type=["str", None],
+        mandatory=True,
     ),
     TypeHintMatch(
         function_name="unit_of_measurement",
@@ -2518,10 +2519,12 @@ _INHERITANCE_MATCH: dict[str, list[ClassTypeHintMatch]] = {
                 TypeHintMatch(
                     function_name="state_class",
                     return_type=["SensorStateClass", "str", None],
+                    mandatory=True,
                 ),
                 TypeHintMatch(
                     function_name="last_reset",
                     return_type=["datetime", None],
+                    mandatory=True,
                 ),
                 TypeHintMatch(
                     function_name="native_value",