Enable strict typing for counter (#106906)

.strict-typing

@@ -121,6 +121,7 @@ homeassistant.components.cloud.*
 homeassistant.components.co2signal.*
 homeassistant.components.command_line.*
 homeassistant.components.configurator.*
+homeassistant.components.counter.*
 homeassistant.components.cover.*
 homeassistant.components.cpuspeed.*
 homeassistant.components.crownstone.*

homeassistant/components/counter/__init__.py

@@ -2,7 +2,7 @@
 from __future__ import annotations
 
 import logging
-from typing import Self
+from typing import Any, Self, TypeVar
 
 import voluptuous as vol
 
@@ -22,6 +22,8 @@ from homeassistant.helpers.restore_state import RestoreEntity
 from homeassistant.helpers.storage import Store
 from homeassistant.helpers.typing import ConfigType
 
+_T = TypeVar("_T")
+
 _LOGGER = logging.getLogger(__name__)
 
 ATTR_INITIAL = "initial"
@@ -59,7 +61,7 @@ STORAGE_FIELDS = {
 }
 
 
-def _none_to_empty_dict(value):
+def _none_to_empty_dict(value: _T | None) -> _T | dict[str, Any]:
     if value is None:
         return {}
     return value
@@ -140,12 +142,12 @@ class CounterStorageCollection(collection.DictStorageCollection):
 
     async def _process_create_data(self, data: dict) -> dict:
         """Validate the config is valid."""
-        return self.CREATE_UPDATE_SCHEMA(data)
+        return self.CREATE_UPDATE_SCHEMA(data)  # type: ignore[no-any-return]
 
     @callback
     def _get_suggested_id(self, info: dict) -> str:
         """Suggest an ID based on the config."""
-        return info[CONF_NAME]
+        return info[CONF_NAME]  # type: ignore[no-any-return]
 
     async def _update_data(self, item: dict, update_data: dict) -> dict:
         """Return a new updated data object."""
@@ -211,9 +213,9 @@ class Counter(collection.CollectionEntity, RestoreEntity):
     @property
     def unique_id(self) -> str | None:
         """Return unique id of the entity."""
-        return self._config[CONF_ID]
+        return self._config[CONF_ID]  # type: ignore[no-any-return]
 
-    def compute_next_state(self, state) -> int:
+    def compute_next_state(self, state: int | None) -> int | None:
         """Keep the state within the range of min/max values."""
         if self._config[CONF_MINIMUM] is not None:
             state = max(self._config[CONF_MINIMUM], state)

mypy.ini

@@ -970,6 +970,16 @@ disallow_untyped_defs = true
 warn_return_any = true
 warn_unreachable = true
 
+[mypy-homeassistant.components.counter.*]
+check_untyped_defs = true
+disallow_incomplete_defs = true
+disallow_subclassing_any = true
+disallow_untyped_calls = true
+disallow_untyped_decorators = true
+disallow_untyped_defs = true
+warn_return_any = true
+warn_unreachable = true
+
 [mypy-homeassistant.components.cover.*]
 check_untyped_defs = true
 disallow_incomplete_defs = true