Strictly type binary_sensor.py. (#56376)

homeassistant/components/modbus/binary_sensor.py

@@ -1,11 +1,13 @@
 """Support for Modbus Coil and Discrete Input sensors."""
 from __future__ import annotations
 
+from datetime import datetime
 import logging
 
 from homeassistant.components.binary_sensor import BinarySensorEntity
 from homeassistant.const import CONF_BINARY_SENSORS, CONF_NAME, STATE_ON
 from homeassistant.core import HomeAssistant
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.restore_state import RestoreEntity
 from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
@@ -19,9 +21,9 @@ _LOGGER = logging.getLogger(__name__)
 async def async_setup_platform(
     hass: HomeAssistant,
     config: ConfigType,
-    async_add_entities,
+    async_add_entities: AddEntitiesCallback,
     discovery_info: DiscoveryInfoType | None = None,
-):
+) -> None:
     """Set up the Modbus binary sensors."""
     sensors = []
 
@@ -38,14 +40,14 @@ async def async_setup_platform(
 class ModbusBinarySensor(BasePlatform, RestoreEntity, BinarySensorEntity):
     """Modbus binary sensor."""
 
-    async def async_added_to_hass(self):
+    async def async_added_to_hass(self) -> None:
         """Handle entity which will be added."""
         await self.async_base_added_to_hass()
         state = await self.async_get_last_state()
         if state:
             self._attr_is_on = state.state == STATE_ON
 
-    async def async_update(self, now=None):
+    async def async_update(self, now: datetime | None = None) -> None:
         """Update the state of the sensor."""
 
         # do not allow multiple active calls to the same platform