Improve met_eireann generic typing (#98278)

homeassistant/components/met_eireann/__init__.py

@@ -1,6 +1,7 @@
 """The met_eireann component."""
 from datetime import timedelta
 import logging
+from typing import Self
 
 import meteireann
 
@@ -33,7 +34,7 @@ async def async_setup_entry(hass: HomeAssistant, config_entry: ConfigEntry) -> b
 
     weather_data = MetEireannWeatherData(hass, config_entry.data, raw_weather_data)
 
-    async def _async_update_data():
+    async def _async_update_data() -> MetEireannWeatherData:
         """Fetch data from Met Éireann."""
         try:
             return await weather_data.fetch_data()
@@ -78,7 +79,7 @@ class MetEireannWeatherData:
         self.daily_forecast = None
         self.hourly_forecast = None
 
-    async def fetch_data(self):
+    async def fetch_data(self) -> Self:
         """Fetch data from API - (current weather and forecast)."""
         await self._weather_data.fetching_data()
         self.current_weather_data = self._weather_data.get_current_weather()

homeassistant/components/met_eireann/weather.py

@@ -22,9 +22,13 @@ from homeassistant.const import (
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers.device_registry import DeviceEntryType, DeviceInfo
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
-from homeassistant.helpers.update_coordinator import CoordinatorEntity
+from homeassistant.helpers.update_coordinator import (
+    CoordinatorEntity,
+    DataUpdateCoordinator,
+)
 from homeassistant.util import dt as dt_util
 
+from . import MetEireannWeatherData
 from .const import CONDITION_MAP, DEFAULT_NAME, DOMAIN, FORECAST_MAP
 
 _LOGGER = logging.getLogger(__name__)
@@ -54,7 +58,9 @@ async def async_setup_entry(
     )
 
 
-class MetEireannWeather(CoordinatorEntity, WeatherEntity):
+class MetEireannWeather(
+    CoordinatorEntity[DataUpdateCoordinator[MetEireannWeatherData]], WeatherEntity
+):
     """Implementation of a Met Éireann weather condition."""
 
     _attr_attribution = "Data provided by Met Éireann"