Flume code quality improvments (#79815)

homeassistant/components/flume/binary_sensor.py

@@ -33,6 +33,11 @@ from .coordinator import (
 from .entity import FlumeEntity
 from .util import get_valid_flume_devices
 
+BINARY_SENSOR_DESCRIPTION_CONNECTED = BinarySensorEntityDescription(
+    name="Connected",
+    key="connected",
+)
+
 
 @dataclass
 class FlumeBinarySensorRequiredKeysMixin:
@@ -93,10 +98,7 @@ async def async_setup_entry(
 
         connection_sensor = FlumeConnectionBinarySensor(
             coordinator=connection_coordinator,
-            description=BinarySensorEntityDescription(
-                name="Connected",
-                key="connected",
-            ),
+            description=BINARY_SENSOR_DESCRIPTION_CONNECTED,
             device_id=device_id,
             location_name=device_location_name,
             is_bridge=(device[KEY_DEVICE_TYPE] is FLUME_TYPE_BRIDGE),

homeassistant/components/flume/entity.py

@@ -10,7 +10,7 @@ from homeassistant.helpers.update_coordinator import (
 from .const import DOMAIN
 
 
-class FlumeEntity(CoordinatorEntity[DataUpdateCoordinator]):
+class FlumeEntity(CoordinatorEntity[DataUpdateCoordinator[None]]):
     """Base entity class."""
 
     _attr_attribution = "Data provided by Flume API"