Fix some typing issues in greeneye_monitor (#58788)

* Improve typing

* Import cast

homeassistant/components/greeneye_monitor/__init__.py

@@ -2,7 +2,6 @@
 from __future__ import annotations
 
 import logging
-from typing import Any
 
 from greeneye import Monitors
 import voluptuous as vol
@@ -18,7 +17,7 @@ from homeassistant.const import (
     TIME_MINUTES,
     TIME_SECONDS,
 )
-from homeassistant.core import HomeAssistant
+from homeassistant.core import Event, HomeAssistant
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.discovery import async_load_platform
 from homeassistant.helpers.typing import ConfigType
@@ -130,7 +129,7 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
     server_config = config[DOMAIN]
     server = await monitors.start_server(server_config[CONF_PORT])
 
-    async def close_server(*args: list[Any]) -> None:
+    async def close_server(event: Event) -> None:
         """Close the monitoring server."""
         await server.close()
 

homeassistant/components/greeneye_monitor/sensor.py

@@ -1,7 +1,7 @@
 """Support for the sensors in a GreenEye Monitor."""
 from __future__ import annotations
 
-from typing import Any, Generic, TypeVar
+from typing import Any, Generic, Optional, TypeVar, cast
 
 import greeneye
 from greeneye import Monitors
@@ -140,7 +140,7 @@ class GEMSensor(Generic[T], SensorEntity):
         if not self._try_connect_to_monitor(monitors):
             monitors.add_listener(self._on_new_monitor)
 
-    def _on_new_monitor(self, *args: list[Any]) -> None:
+    def _on_new_monitor(self, monitor: greeneye.monitor.Monitor) -> None:
         monitors = self.hass.data[DATA_GREENEYE_MONITOR]
         if self._try_connect_to_monitor(monitors):
             monitors.remove_listener(self._on_new_monitor)
@@ -192,8 +192,7 @@ class CurrentSensor(GEMSensor[greeneye.monitor.Channel]):
         if not self._sensor:
             return None
 
-        assert isinstance(self._sensor.watts, float)
+        return cast(Optional[float], self._sensor.watts)
-        return self._sensor.watts
 
     @property
     def extra_state_attributes(self) -> dict[str, Any] | None:
@@ -245,8 +244,7 @@ class PulseCounter(GEMSensor[greeneye.monitor.PulseCounter]):
             * self._counted_quantity_per_pulse
             * self._seconds_per_time_unit
         )
-        assert isinstance(result, float)
+        return cast(float, result)
-        return result
 
     @property
     def _seconds_per_time_unit(self) -> int:
@@ -301,8 +299,7 @@ class TemperatureSensor(GEMSensor[greeneye.monitor.TemperatureSensor]):
         if not self._sensor:
             return None
 
-        assert isinstance(self._sensor.temperature, float)
+        return cast(Optional[float], self._sensor.temperature)
-        return self._sensor.temperature
 
     @property
     def native_unit_of_measurement(self) -> str:
@@ -332,5 +329,4 @@ class VoltageSensor(GEMSensor[greeneye.monitor.Monitor]):
         if not self._sensor:
             return None
 
-        assert isinstance(self._sensor.voltage, float)
+        return cast(Optional[float], self._sensor.voltage)
-        return self._sensor.voltage