Use EventType for system events (#115190)

homeassistant/components/api/__init__.py

@@ -49,6 +49,7 @@ from homeassistant.helpers import config_validation as cv, template
 from homeassistant.helpers.json import json_dumps, json_fragment
 from homeassistant.helpers.service import async_get_all_descriptions
 from homeassistant.helpers.typing import ConfigType
+from homeassistant.util.event_type import EventType
 from homeassistant.util.json import json_loads
 
 _LOGGER = logging.getLogger(__name__)
@@ -134,7 +135,7 @@ class APIEventStream(HomeAssistantView):
         stop_obj = object()
         to_write: asyncio.Queue[object | str] = asyncio.Queue()
 
-        restrict: list[str] | None = None
+        restrict: list[EventType[Any] | str] | None = None
         if restrict_str := request.query.get("restrict"):
             restrict = [*restrict_str.split(","), EVENT_HOMEASSISTANT_STOP]
 

homeassistant/components/homeassistant/logbook.py

@@ -12,6 +12,7 @@ from homeassistant.components.logbook import (
 )
 from homeassistant.const import EVENT_HOMEASSISTANT_START, EVENT_HOMEASSISTANT_STOP
 from homeassistant.core import Event, HomeAssistant, callback
+from homeassistant.helpers.typing import NoEventData
 from homeassistant.util.event_type import EventType
 
 from . import DOMAIN
@@ -25,12 +26,14 @@ EVENT_TO_NAME: dict[EventType[Any] | str, str] = {
 @callback
 def async_describe_events(
     hass: HomeAssistant,
-    async_describe_event: Callable[[str, str, Callable[[Event], dict[str, str]]], None],
+    async_describe_event: Callable[
+        [str, EventType[NoEventData] | str, Callable[[Event], dict[str, str]]], None
+    ],
 ) -> None:
     """Describe logbook events."""
 
     @callback
-    def async_describe_hass_event(event: Event) -> dict[str, str]:
+    def async_describe_hass_event(event: Event[NoEventData]) -> dict[str, str]:
         """Describe homeassistant logbook event."""
         return {
             LOGBOOK_ENTRY_NAME: "Home Assistant",

homeassistant/const.py

@@ -18,6 +18,7 @@ from .util.signal_type import SignalType
 
 if TYPE_CHECKING:
     from .core import EventStateChangedData
+    from .helpers.typing import NoEventData
 
 APPLICATION_NAME: Final = "HomeAssistant"
 MAJOR_VERSION: Final = 2024
@@ -302,11 +303,13 @@ CONF_ZONE: Final = "zone"
 EVENT_CALL_SERVICE: Final = "call_service"
 EVENT_COMPONENT_LOADED: Final = "component_loaded"
 EVENT_CORE_CONFIG_UPDATE: Final = "core_config_updated"
-EVENT_HOMEASSISTANT_CLOSE: Final = "homeassistant_close"
+EVENT_HOMEASSISTANT_CLOSE: EventType[NoEventData] = EventType("homeassistant_close")
-EVENT_HOMEASSISTANT_START: Final = "homeassistant_start"
+EVENT_HOMEASSISTANT_START: EventType[NoEventData] = EventType("homeassistant_start")
-EVENT_HOMEASSISTANT_STARTED: Final = "homeassistant_started"
+EVENT_HOMEASSISTANT_STARTED: EventType[NoEventData] = EventType("homeassistant_started")
-EVENT_HOMEASSISTANT_STOP: Final = "homeassistant_stop"
+EVENT_HOMEASSISTANT_STOP: EventType[NoEventData] = EventType("homeassistant_stop")
-EVENT_HOMEASSISTANT_FINAL_WRITE: Final = "homeassistant_final_write"
+EVENT_HOMEASSISTANT_FINAL_WRITE: EventType[NoEventData] = EventType(
+    "homeassistant_final_write"
+)
 EVENT_LOGBOOK_ENTRY: Final = "logbook_entry"
 EVENT_LOGGING_CHANGED: Final = "logging_changed"
 EVENT_SERVICE_REGISTERED: Final = "service_registered"

homeassistant/helpers/start.py

@@ -14,13 +14,16 @@ from homeassistant.core import (
     HomeAssistant,
     callback,
 )
+from homeassistant.util.event_type import EventType
+
+from .typing import NoEventData
 
 
 @callback
 def _async_at_core_state(
     hass: HomeAssistant,
     at_start_cb: Callable[[HomeAssistant], Coroutine[Any, Any, None] | None],
-    event_type: str,
+    event_type: EventType[NoEventData],
     check_state: Callable[[HomeAssistant], bool],
 ) -> CALLBACK_TYPE:
     """Execute a job at_start_cb when Home Assistant has the wanted state.

homeassistant/helpers/typing.py

@@ -3,7 +3,7 @@
 from collections.abc import Mapping
 from enum import Enum
 from functools import partial
-from typing import Any
+from typing import Any, Never
 
 import homeassistant.core
 
@@ -20,6 +20,7 @@ DiscoveryInfoType = dict[str, Any]
 ServiceDataType = dict[str, Any]
 StateType = str | int | float | None
 TemplateVarsType = Mapping[str, Any] | None
+NoEventData = Mapping[str, Never]
 
 # Custom type for recorder Queries
 QueryType = Any