Improve notify type hints (home-assistant#86685)

homeassistant/components/notify/__init__.py

@@ -9,6 +9,7 @@
 from homeassistant.const import CONF_NAME, CONF_PLATFORM
 from homeassistant.core import HomeAssistant, ServiceCall
 import homeassistant.helpers.config_validation as cv
+from homeassistant.helpers.template import Template
 from homeassistant.helpers.typing import ConfigType
 
 from .const import (  # noqa: F401
@@ -58,11 +59,12 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
 
     async def persistent_notification(service: ServiceCall) -> None:
         """Send notification via the built-in persistent_notify integration."""
-        message = service.data[ATTR_MESSAGE]
+        message: Template = service.data[ATTR_MESSAGE]
         message.hass = hass
         check_templates_warn(hass, message)
 
         title = None
+        title_tpl: Template | None
         if title_tpl := service.data.get(ATTR_TITLE):
             check_templates_warn(hass, title_tpl)
             title_tpl.hass = hass

homeassistant/components/notify/legacy.py

@@ -9,8 +9,9 @@
 from homeassistant.const import CONF_DESCRIPTION, CONF_NAME
 from homeassistant.core import HomeAssistant, ServiceCall, callback
 from homeassistant.exceptions import HomeAssistantError
-from homeassistant.helpers import config_per_platform, discovery, template
+from homeassistant.helpers import config_per_platform, discovery
 from homeassistant.helpers.service import async_set_service_schema
+from homeassistant.helpers.template import Template
 from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 from homeassistant.loader import async_get_integration, bind_hass
 from homeassistant.setup import async_prepare_setup_platform, async_start_setup
@@ -144,7 +145,7 @@ async def async_platform_discovered(
 
 
 @callback
-def check_templates_warn(hass: HomeAssistant, tpl: template.Template) -> None:
+def check_templates_warn(hass: HomeAssistant, tpl: Template) -> None:
     """Warn user that passing templates to notify service is deprecated."""
     if tpl.is_static or hass.data.get("notify_template_warned"):
         return
@@ -217,7 +218,12 @@ class BaseNotificationService:
     hass: HomeAssistant = None  # type: ignore[assignment]
 
     # Name => target
-    registered_targets: dict[str, str]
+    registered_targets: dict[str, Any]
+
+    @property
+    def targets(self) -> dict[str, Any] | None:
+        """Return a dictionary of registered targets."""
+        return None
 
     def send_message(self, message: str, **kwargs: Any) -> None:
         """Send a message.
@@ -238,8 +244,8 @@ async def async_send_message(self, message: str, **kwargs: Any) -> None:
     async def _async_notify_message_service(self, service: ServiceCall) -> None:
         """Handle sending notification message service calls."""
         kwargs = {}
-        message = service.data[ATTR_MESSAGE]
-
+        message: Template = service.data[ATTR_MESSAGE]
+        title: Template | None
         if title := service.data.get(ATTR_TITLE):
             check_templates_warn(self.hass, title)
             title.hass = self.hass
@@ -279,7 +285,7 @@ async def async_setup(
 
     async def async_register_services(self) -> None:
         """Create or update the notify services."""
-        if hasattr(self, "targets"):
+        if self.targets is not None:
             stale_targets = set(self.registered_targets)
 
             for name, target in self.targets.items():

pylint/plugins/hass_enforce_type_hints.py

@@ -1967,6 +1967,10 @@ class ClassTypeHintMatch:
         ClassTypeHintMatch(
             base_class="BaseNotificationService",
             matches=[
+                TypeHintMatch(
+                    function_name="targets",
+                    return_type=["dict[str, Any]", None],
+                ),
                 TypeHintMatch(
                     function_name="send_message",
                     arg_types={1: "str"},