diff --git a/.strict-typing b/.strict-typing
index 8de6e9871d3..d62c32615fd 100644
--- a/.strict-typing
+++ b/.strict-typing
@@ -190,6 +190,7 @@ homeassistant.components.wallbox.*
 homeassistant.components.water_heater.*
 homeassistant.components.watttime.*
 homeassistant.components.weather.*
+homeassistant.components.webostv.*
 homeassistant.components.websocket_api.*
 homeassistant.components.wemo.*
 homeassistant.components.whois.*
diff --git a/homeassistant/components/webostv/__init__.py b/homeassistant/components/webostv/__init__.py
index cdb3927b4e0..d5335c4fdcd 100644
--- a/homeassistant/components/webostv/__init__.py
+++ b/homeassistant/components/webostv/__init__.py
@@ -16,7 +16,7 @@ import voluptuous as vol
 
 from homeassistant.components import notify as hass_notify
 from homeassistant.components.automation import AutomationActionType
-from homeassistant.config_entries import SOURCE_IMPORT
+from homeassistant.config_entries import SOURCE_IMPORT, ConfigEntry
 from homeassistant.const import (
     ATTR_COMMAND,
     ATTR_ENTITY_ID,
@@ -29,7 +29,14 @@ from homeassistant.const import (
     EVENT_HOMEASSISTANT_STOP,
     Platform,
 )
-from homeassistant.core import Context, HassJob, HomeAssistant, ServiceCall, callback
+from homeassistant.core import (
+    Context,
+    Event,
+    HassJob,
+    HomeAssistant,
+    ServiceCall,
+    callback,
+)
 from homeassistant.helpers import config_validation as cv, discovery, entity_registry
 from homeassistant.helpers.dispatcher import async_dispatcher_send
 from homeassistant.helpers.typing import ConfigType
@@ -102,7 +109,7 @@ SERVICE_TO_METHOD = {
 _LOGGER = logging.getLogger(__name__)
 
 
-def read_client_keys(config_file):
+def read_client_keys(config_file: str) -> dict[str, str]:
     """Read legacy client keys from file."""
     if not os.path.isfile(config_file):
         return {}
@@ -111,7 +118,9 @@ def read_client_keys(config_file):
     with open(config_file, encoding="utf8") as json_file:
         try:
             client_keys = json.load(json_file)
-            return client_keys
+            if isinstance(client_keys, dict):
+                return client_keys
+            return {}
         except (json.JSONDecodeError, UnicodeDecodeError):
             pass
 
@@ -119,8 +128,8 @@ def read_client_keys(config_file):
     engine = db.create_engine(f"sqlite:///{config_file}")
     table = db.Table("unnamed", db.MetaData(), autoload=True, autoload_with=engine)
     results = engine.connect().execute(db.select([table])).fetchall()
-    client_keys = {k: loads(v) for k, v in results}
-    return client_keys
+    db_client_keys = {k: loads(v) for k, v in results}
+    return db_client_keys
 
 
 async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
@@ -139,7 +148,9 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
         _LOGGER.debug("No pairing keys, Not importing webOS Smart TV YAML config")
         return True
 
-    async def async_migrate_task(entity_id, conf, key):
+    async def async_migrate_task(
+        entity_id: str, conf: dict[str, str], key: str
+    ) -> None:
         _LOGGER.debug("Migrating webOS Smart TV entity %s unique_id", entity_id)
         client = WebOsClient(conf[CONF_HOST], key)
         tries = 0
@@ -181,7 +192,7 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
         if entity_id := ent_reg.async_get_entity_id(Platform.MEDIA_PLAYER, DOMAIN, key):
             tasks.append(asyncio.create_task(async_migrate_task(entity_id, conf, key)))
 
-    async def async_tasks_cancel(_event):
+    async def async_tasks_cancel(_event: Event) -> None:
         """Cancel config flow import tasks."""
         for task in tasks:
             if not task.done():
@@ -192,12 +203,12 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
     return True
 
 
-def _async_migrate_options_from_data(hass, config_entry):
+def _async_migrate_options_from_data(hass: HomeAssistant, entry: ConfigEntry) -> None:
     """Migrate options from data."""
-    if config_entry.options:
+    if entry.options:
         return
 
-    config = config_entry.data
+    config = entry.data
     options = {}
 
     # Get Preferred Sources
@@ -206,15 +217,15 @@ def _async_migrate_options_from_data(hass, config_entry):
         if not isinstance(sources, list):
             options[CONF_SOURCES] = sources.split(",")
 
-    hass.config_entries.async_update_entry(config_entry, options=options)
+    hass.config_entries.async_update_entry(entry, options=options)
 
 
-async def async_setup_entry(hass, config_entry):
+async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     """Set the config entry up."""
-    _async_migrate_options_from_data(hass, config_entry)
+    _async_migrate_options_from_data(hass, entry)
 
-    host = config_entry.data[CONF_HOST]
-    key = config_entry.data[CONF_CLIENT_SECRET]
+    host = entry.data[CONF_HOST]
+    key = entry.data[CONF_CLIENT_SECRET]
 
     wrapper = WebOsClientWrapper(host, client_key=key)
     await wrapper.connect()
@@ -231,8 +242,8 @@ async def async_setup_entry(hass, config_entry):
             DOMAIN, service, async_service_handler, schema=schema
         )
 
-    hass.data[DOMAIN][DATA_CONFIG_ENTRY][config_entry.entry_id] = wrapper
-    hass.config_entries.async_setup_platforms(config_entry, PLATFORMS)
+    hass.data[DOMAIN][DATA_CONFIG_ENTRY][entry.entry_id] = wrapper
+    hass.config_entries.async_setup_platforms(entry, PLATFORMS)
 
     # set up notify platform, no entry support for notify component yet,
     # have to use discovery to load platform.
@@ -242,31 +253,29 @@ async def async_setup_entry(hass, config_entry):
             "notify",
             DOMAIN,
             {
-                CONF_NAME: config_entry.title,
-                ATTR_CONFIG_ENTRY_ID: config_entry.entry_id,
+                CONF_NAME: entry.title,
+                ATTR_CONFIG_ENTRY_ID: entry.entry_id,
             },
             hass.data[DOMAIN][DATA_HASS_CONFIG],
         )
     )
 
-    if not config_entry.update_listeners:
-        config_entry.async_on_unload(
-            config_entry.add_update_listener(async_update_options)
-        )
+    if not entry.update_listeners:
+        entry.async_on_unload(entry.add_update_listener(async_update_options))
 
-    async def async_on_stop(_event):
+    async def async_on_stop(_event: Event) -> None:
         """Unregister callbacks and disconnect."""
         await wrapper.shutdown()
 
-    config_entry.async_on_unload(
+    entry.async_on_unload(
         hass.bus.async_listen_once(EVENT_HOMEASSISTANT_STOP, async_on_stop)
     )
     return True
 
 
-async def async_update_options(hass, config_entry):
+async def async_update_options(hass: HomeAssistant, entry: ConfigEntry) -> None:
     """Update options."""
-    await hass.config_entries.async_reload(config_entry.entry_id)
+    await hass.config_entries.async_reload(entry.entry_id)
 
 
 async def async_control_connect(host: str, key: str | None) -> WebOsClient:
@@ -281,7 +290,7 @@ async def async_control_connect(host: str, key: str | None) -> WebOsClient:
     return client
 
 
-async def async_unload_entry(hass, entry):
+async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     """Unload a config entry."""
     unload_ok = await hass.config_entries.async_unload_platforms(entry, PLATFORMS)
 
@@ -305,7 +314,7 @@ class PluggableAction:
         """Initialize."""
         self._actions: dict[Callable[[], None], tuple[HassJob, dict[str, Any]]] = {}
 
-    def __bool__(self):
+    def __bool__(self) -> bool:
         """Return if we have something attached."""
         return bool(self._actions)
 
diff --git a/homeassistant/components/webostv/config_flow.py b/homeassistant/components/webostv/config_flow.py
index 10f7686d807..91574d768bb 100644
--- a/homeassistant/components/webostv/config_flow.py
+++ b/homeassistant/components/webostv/config_flow.py
@@ -2,6 +2,7 @@
 from __future__ import annotations
 
 import logging
+from typing import Any
 from urllib.parse import urlparse
 
 from aiowebostv import WebOsTvPairError
@@ -13,6 +14,7 @@ from homeassistant.const import CONF_CLIENT_SECRET, CONF_HOST, CONF_NAME, CONF_U
 from homeassistant.core import callback
 from homeassistant.data_entry_flow import FlowResult
 from homeassistant.helpers import config_validation as cv
+from homeassistant.helpers.typing import ConfigType
 
 from . import async_control_connect
 from .const import CONF_SOURCES, DEFAULT_NAME, DOMAIN, WEBOSTV_EXCEPTIONS
@@ -33,19 +35,21 @@ class FlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
 
     VERSION = 1
 
-    def __init__(self):
+    def __init__(self) -> None:
         """Initialize workflow."""
-        self._host = None
-        self._name = None
-        self._uuid = None
+        self._host: str = ""
+        self._name: str = ""
+        self._uuid: str | None = None
 
     @staticmethod
     @callback
-    def async_get_options_flow(config_entry):
+    def async_get_options_flow(
+        config_entry: config_entries.ConfigEntry,
+    ) -> OptionsFlowHandler:
         """Get the options flow for this handler."""
         return OptionsFlowHandler(config_entry)
 
-    async def async_step_import(self, import_info):
+    async def async_step_import(self, import_info: dict[str, Any]) -> FlowResult:
         """Set the config entry up from yaml."""
         self._host = import_info[CONF_HOST]
         self._name = import_info.get(CONF_NAME) or import_info[CONF_HOST]
@@ -60,9 +64,11 @@ class FlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
         _LOGGER.debug("WebOS Smart TV host %s imported from YAML config", self._host)
         return self.async_create_entry(title=self._name, data=data)
 
-    async def async_step_user(self, user_input=None):
+    async def async_step_user(
+        self, user_input: dict[str, Any] | None = None
+    ) -> FlowResult:
         """Handle a flow initialized by the user."""
-        errors = {}
+        errors: dict[str, str] = {}
         if user_input is not None:
             self._host = user_input[CONF_HOST]
             self._name = user_input[CONF_NAME]
@@ -73,7 +79,7 @@ class FlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
         )
 
     @callback
-    def _async_check_configured_entry(self):
+    def _async_check_configured_entry(self) -> None:
         """Check if entry is configured, update unique_id if needed."""
         for entry in self._async_current_entries(include_ignore=False):
             if entry.data[CONF_HOST] != self._host:
@@ -89,7 +95,9 @@ class FlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
 
             raise data_entry_flow.AbortFlow("already_configured")
 
-    async def async_step_pairing(self, user_input=None):
+    async def async_step_pairing(
+        self, user_input: dict[str, Any] | None = None
+    ) -> FlowResult:
         """Display pairing form."""
         self._async_check_configured_entry()
 
@@ -119,10 +127,14 @@ class FlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
 
     async def async_step_ssdp(self, discovery_info: ssdp.SsdpServiceInfo) -> FlowResult:
         """Handle a flow initialized by discovery."""
-        self._host = urlparse(discovery_info.ssdp_location).hostname
+        assert discovery_info.ssdp_location
+        host = urlparse(discovery_info.ssdp_location).hostname
+        assert host
+        self._host = host
         self._name = discovery_info.upnp[ssdp.ATTR_UPNP_FRIENDLY_NAME]
 
         uuid = discovery_info.upnp[ssdp.ATTR_UPNP_UDN]
+        assert uuid
         if uuid.startswith("uuid:"):
             uuid = uuid[5:]
         await self.async_set_unique_id(uuid)
@@ -139,14 +151,14 @@ class FlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
 class OptionsFlowHandler(config_entries.OptionsFlow):
     """Handle options."""
 
-    def __init__(self, config_entry):
+    def __init__(self, config_entry: config_entries.ConfigEntry) -> None:
         """Initialize options flow."""
         self.config_entry = config_entry
         self.options = config_entry.options
         self.host = config_entry.data[CONF_HOST]
         self.key = config_entry.data[CONF_CLIENT_SECRET]
 
-    async def async_step_init(self, user_input=None):
+    async def async_step_init(self, user_input: ConfigType | None = None) -> FlowResult:
         """Manage the options."""
         errors = {}
         if user_input is not None:
@@ -155,7 +167,7 @@ class OptionsFlowHandler(config_entries.OptionsFlow):
         # Get sources
         sources = self.options.get(CONF_SOURCES, "")
         sources_list = await async_get_sources(self.host, self.key)
-        if sources_list is None:
+        if not sources_list:
             errors["base"] = "cannot_retrieve"
 
         options_schema = vol.Schema(
@@ -163,7 +175,7 @@ class OptionsFlowHandler(config_entries.OptionsFlow):
                 vol.Optional(
                     CONF_SOURCES,
                     description={"suggested_value": sources},
-                ): cv.multi_select(sources_list),
+                ): cv.multi_select({source: source for source in sources_list}),
             }
         )
 
@@ -172,12 +184,12 @@ class OptionsFlowHandler(config_entries.OptionsFlow):
         )
 
 
-async def async_get_sources(host, key):
+async def async_get_sources(host: str, key: str) -> list[str]:
     """Construct sources list."""
     try:
         client = await async_control_connect(host, key)
     except WEBOSTV_EXCEPTIONS:
-        return None
+        return []
 
     return [
         *(app["title"] for app in client.apps.values()),
diff --git a/homeassistant/components/webostv/helpers.py b/homeassistant/components/webostv/helpers.py
index 86117d12e71..d3f5fec6826 100644
--- a/homeassistant/components/webostv/helpers.py
+++ b/homeassistant/components/webostv/helpers.py
@@ -71,6 +71,7 @@ def async_get_client_wrapper_by_device_entry(
     Raises ValueError if client wrapper is not found.
     """
     for config_entry_id in device.config_entries:
+        wrapper: WebOsClientWrapper | None
         if wrapper := hass.data[DOMAIN][DATA_CONFIG_ENTRY].get(config_entry_id):
             break
 
diff --git a/homeassistant/components/webostv/media_player.py b/homeassistant/components/webostv/media_player.py
index 45cfef5e1b0..74e7e63b2d0 100644
--- a/homeassistant/components/webostv/media_player.py
+++ b/homeassistant/components/webostv/media_player.py
@@ -1,12 +1,15 @@
 """Support for interface with an LG webOS Smart TV."""
 from __future__ import annotations
 
+from collections.abc import Awaitable, Callable, Coroutine
 from contextlib import suppress
 from datetime import timedelta
 from functools import wraps
 import logging
+from typing import Any, TypeVar, cast
 
 from aiowebostv import WebOsClient, WebOsTvPairError
+from typing_extensions import Concatenate, ParamSpec
 
 from homeassistant import util
 from homeassistant.components.media_player import (
@@ -37,6 +40,7 @@ from homeassistant.const import (
 )
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
+from homeassistant.helpers.entity import DeviceInfo
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
 from . import WebOsClientWrapper
@@ -76,6 +80,7 @@ async def async_setup_entry(
 ) -> None:
     """Set up the LG webOS Smart TV platform."""
     unique_id = config_entry.unique_id
+    assert unique_id
     name = config_entry.title
     sources = config_entry.options.get(CONF_SOURCES)
     wrapper = hass.data[DOMAIN][DATA_CONFIG_ENTRY][config_entry.entry_id]
@@ -83,17 +88,23 @@ async def async_setup_entry(
     async_add_entities([LgWebOSMediaPlayerEntity(wrapper, name, sources, unique_id)])
 
 
-def cmd(func):
+_T = TypeVar("_T", bound="LgWebOSMediaPlayerEntity")
+_P = ParamSpec("_P")
+
+
+def cmd(
+    func: Callable[Concatenate[_T, _P], Awaitable[None]]  # type: ignore[misc]
+) -> Callable[Concatenate[_T, _P], Coroutine[Any, Any, None]]:  # type: ignore[misc]
     """Catch command exceptions."""
 
     @wraps(func)
-    async def cmd_wrapper(obj, *args, **kwargs):
+    async def cmd_wrapper(self: _T, *args: _P.args, **kwargs: _P.kwargs) -> None:
         """Wrap all command methods."""
         try:
-            await func(obj, *args, **kwargs)
+            await func(self, *args, **kwargs)
         except WEBOSTV_EXCEPTIONS as exc:
             # If TV is off, we expect calls to fail.
-            if obj.state == STATE_OFF:
+            if self.state == STATE_OFF:
                 level = logging.INFO
             else:
                 level = logging.ERROR
@@ -101,7 +112,7 @@ def cmd(func):
                 level,
                 "Error calling %s on entity %s: %r",
                 func.__name__,
-                obj.entity_id,
+                self.entity_id,
                 exc,
             )
 
@@ -112,11 +123,15 @@ class LgWebOSMediaPlayerEntity(MediaPlayerEntity):
     """Representation of a LG webOS Smart TV."""
 
     def __init__(
-        self, wrapper: WebOsClientWrapper, name: str, sources, unique_id
+        self,
+        wrapper: WebOsClientWrapper,
+        name: str,
+        sources: list[str] | None,
+        unique_id: str,
     ) -> None:
         """Initialize the webos device."""
         self._wrapper = wrapper
-        self._client = wrapper.client
+        self._client: WebOsClient = wrapper.client
         self._name = name
         self._unique_id = unique_id
         self._sources = sources
@@ -127,7 +142,7 @@ class LgWebOSMediaPlayerEntity(MediaPlayerEntity):
         self._current_source = None
         self._source_list: dict = {}
 
-    async def async_added_to_hass(self):
+    async def async_added_to_hass(self) -> None:
         """Connect and subscribe to dispatcher signals and state updates."""
         self.async_on_remove(
             async_dispatcher_connect(self.hass, DOMAIN, self.async_signal_handler)
@@ -137,11 +152,11 @@ class LgWebOSMediaPlayerEntity(MediaPlayerEntity):
             self.async_handle_state_update
         )
 
-    async def async_will_remove_from_hass(self):
+    async def async_will_remove_from_hass(self) -> None:
         """Call disconnect on removal."""
         self._client.unregister_state_update_callback(self.async_handle_state_update)
 
-    async def async_signal_handler(self, data):
+    async def async_signal_handler(self, data: dict[str, Any]) -> None:
         """Handle domain-specific signal by calling appropriate method."""
         if (entity_ids := data[ATTR_ENTITY_ID]) == ENTITY_MATCH_NONE:
             return
@@ -154,12 +169,12 @@ class LgWebOSMediaPlayerEntity(MediaPlayerEntity):
             }
             await getattr(self, data["method"])(**params)
 
-    async def async_handle_state_update(self, _client: WebOsClient):
+    async def async_handle_state_update(self, _client: WebOsClient) -> None:
         """Update state from WebOsClient."""
         self.update_sources()
         self.async_write_ha_state()
 
-    def update_sources(self):
+    def update_sources(self) -> None:
         """Update list of sources from current source, apps, inputs and configured list."""
         source_list = self._source_list
         self._source_list = {}
@@ -211,7 +226,7 @@ class LgWebOSMediaPlayerEntity(MediaPlayerEntity):
             self._source_list = source_list
 
     @util.Throttle(MIN_TIME_BETWEEN_SCANS, MIN_TIME_BETWEEN_FORCED_SCANS)
-    async def async_update(self):
+    async def async_update(self) -> None:
         """Connect."""
         if self._client.is_connected():
             return
@@ -220,22 +235,22 @@ class LgWebOSMediaPlayerEntity(MediaPlayerEntity):
             await self._client.connect()
 
     @property
-    def unique_id(self):
+    def unique_id(self) -> str:
         """Return the unique id of the device."""
         return self._unique_id
 
     @property
-    def name(self):
+    def name(self) -> str:
         """Return the name of the device."""
         return self._name
 
     @property
-    def device_class(self):
+    def device_class(self) -> MediaPlayerDeviceClass:
         """Return the device class of the device."""
         return MediaPlayerDeviceClass.TV
 
     @property
-    def state(self):
+    def state(self) -> str:
         """Return the state of the device."""
         if self._client.is_on:
             return STATE_ON
@@ -243,30 +258,30 @@ class LgWebOSMediaPlayerEntity(MediaPlayerEntity):
         return STATE_OFF
 
     @property
-    def is_volume_muted(self):
+    def is_volume_muted(self) -> bool:
         """Boolean if volume is currently muted."""
-        return self._client.muted
+        return cast(bool, self._client.muted)
 
     @property
-    def volume_level(self):
+    def volume_level(self) -> float | None:
         """Volume level of the media player (0..1)."""
         if self._client.volume is not None:
-            return self._client.volume / 100.0
+            return cast(float, self._client.volume / 100.0)
 
         return None
 
     @property
-    def source(self):
+    def source(self) -> str | None:
         """Return the current input source."""
         return self._current_source
 
     @property
-    def source_list(self):
+    def source_list(self) -> list[str]:
         """List of available input sources."""
         return sorted(self._source_list)
 
     @property
-    def media_content_type(self):
+    def media_content_type(self) -> str | None:
         """Content type of current playing media."""
         if self._client.current_app_id == LIVE_TV_APP_ID:
             return MEDIA_TYPE_CHANNEL
@@ -274,26 +289,26 @@ class LgWebOSMediaPlayerEntity(MediaPlayerEntity):
         return None
 
     @property
-    def media_title(self):
+    def media_title(self) -> str | None:
         """Title of current playing media."""
         if (self._client.current_app_id == LIVE_TV_APP_ID) and (
             self._client.current_channel is not None
         ):
-            return self._client.current_channel.get("channelName")
+            return cast(str, self._client.current_channel.get("channelName"))
         return None
 
     @property
-    def media_image_url(self):
+    def media_image_url(self) -> str | None:
         """Image url of current playing media."""
         if self._client.current_app_id in self._client.apps:
-            icon = self._client.apps[self._client.current_app_id]["largeIcon"]
+            icon: str = self._client.apps[self._client.current_app_id]["largeIcon"]
             if not icon.startswith("http"):
                 icon = self._client.apps[self._client.current_app_id]["icon"]
             return icon
         return None
 
     @property
-    def supported_features(self):
+    def supported_features(self) -> int:
         """Flag media player features that are supported."""
         supported = SUPPORT_WEBOSTV
 
@@ -308,13 +323,13 @@ class LgWebOSMediaPlayerEntity(MediaPlayerEntity):
         return supported
 
     @property
-    def device_info(self):
+    def device_info(self) -> DeviceInfo:
         """Return device information."""
-        device_info = {
-            "identifiers": {(DOMAIN, self._unique_id)},
-            "manufacturer": "LG",
-            "name": self._name,
-        }
+        device_info = DeviceInfo(
+            identifiers={(DOMAIN, self._unique_id)},
+            manufacturer="LG",
+            name=self._name,
+        )
 
         if self._client.system_info is None and self.state == STATE_OFF:
             return device_info
@@ -331,49 +346,49 @@ class LgWebOSMediaPlayerEntity(MediaPlayerEntity):
         return device_info
 
     @property
-    def extra_state_attributes(self):
+    def extra_state_attributes(self) -> dict[str, str] | None:
         """Return device specific state attributes."""
         if self._client.sound_output is None and self.state == STATE_OFF:
-            return {}
+            return None
         return {ATTR_SOUND_OUTPUT: self._client.sound_output}
 
     @cmd
-    async def async_turn_off(self):
+    async def async_turn_off(self) -> None:
         """Turn off media player."""
         await self._client.power_off()
 
-    async def async_turn_on(self):
+    async def async_turn_on(self) -> None:
         """Turn on media player."""
         self._wrapper.turn_on.async_run(self.hass, self._context)
 
     @cmd
-    async def async_volume_up(self):
+    async def async_volume_up(self) -> None:
         """Volume up the media player."""
         await self._client.volume_up()
 
     @cmd
-    async def async_volume_down(self):
+    async def async_volume_down(self) -> None:
         """Volume down media player."""
         await self._client.volume_down()
 
     @cmd
-    async def async_set_volume_level(self, volume):
+    async def async_set_volume_level(self, volume: int) -> None:
         """Set volume level, range 0..1."""
         tv_volume = int(round(volume * 100))
         await self._client.set_volume(tv_volume)
 
     @cmd
-    async def async_mute_volume(self, mute):
+    async def async_mute_volume(self, mute: bool) -> None:
         """Send mute command."""
         await self._client.set_mute(mute)
 
     @cmd
-    async def async_select_sound_output(self, sound_output):
+    async def async_select_sound_output(self, sound_output: str) -> None:
         """Select the sound output."""
         await self._client.change_sound_output(sound_output)
 
     @cmd
-    async def async_media_play_pause(self):
+    async def async_media_play_pause(self) -> None:
         """Simulate play pause media player."""
         if self._paused:
             await self.async_media_play()
@@ -381,7 +396,7 @@ class LgWebOSMediaPlayerEntity(MediaPlayerEntity):
             await self.async_media_pause()
 
     @cmd
-    async def async_select_source(self, source):
+    async def async_select_source(self, source: str) -> None:
         """Select input source."""
         if (source_dict := self._source_list.get(source)) is None:
             _LOGGER.warning("Source %s not found for %s", source, self.name)
@@ -392,7 +407,9 @@ class LgWebOSMediaPlayerEntity(MediaPlayerEntity):
             await self._client.set_input(source_dict["id"])
 
     @cmd
-    async def async_play_media(self, media_type, media_id, **kwargs):
+    async def async_play_media(
+        self, media_type: str, media_id: str, **kwargs: Any
+    ) -> None:
         """Play a piece of media."""
         _LOGGER.debug("Call play media type <%s>, Id <%s>", media_type, media_id)
 
@@ -427,24 +444,24 @@ class LgWebOSMediaPlayerEntity(MediaPlayerEntity):
                 await self._client.set_channel(partial_match_channel_id)
 
     @cmd
-    async def async_media_play(self):
+    async def async_media_play(self) -> None:
         """Send play command."""
         self._paused = False
         await self._client.play()
 
     @cmd
-    async def async_media_pause(self):
+    async def async_media_pause(self) -> None:
         """Send media pause command to media player."""
         self._paused = True
         await self._client.pause()
 
     @cmd
-    async def async_media_stop(self):
+    async def async_media_stop(self) -> None:
         """Send stop command to media player."""
         await self._client.stop()
 
     @cmd
-    async def async_media_next_track(self):
+    async def async_media_next_track(self) -> None:
         """Send next track command."""
         current_input = self._client.get_input()
         if current_input == LIVE_TV_APP_ID:
@@ -453,7 +470,7 @@ class LgWebOSMediaPlayerEntity(MediaPlayerEntity):
             await self._client.fast_forward()
 
     @cmd
-    async def async_media_previous_track(self):
+    async def async_media_previous_track(self) -> None:
         """Send the previous track command."""
         current_input = self._client.get_input()
         if current_input == LIVE_TV_APP_ID:
@@ -462,11 +479,11 @@ class LgWebOSMediaPlayerEntity(MediaPlayerEntity):
             await self._client.rewind()
 
     @cmd
-    async def async_button(self, button):
+    async def async_button(self, button: str) -> None:
         """Send a button press."""
         await self._client.button(button)
 
     @cmd
-    async def async_command(self, command, **kwargs):
+    async def async_command(self, command: str, **kwargs: Any) -> None:
         """Send a command."""
         await self._client.request(command, payload=kwargs.get(ATTR_PAYLOAD))
diff --git a/homeassistant/components/webostv/notify.py b/homeassistant/components/webostv/notify.py
index db330eb0227..df2ed7e5063 100644
--- a/homeassistant/components/webostv/notify.py
+++ b/homeassistant/components/webostv/notify.py
@@ -1,39 +1,46 @@
 """Support for LG WebOS TV notification service."""
-import logging
+from __future__ import annotations
 
-from aiowebostv import WebOsTvPairError
+import logging
+from typing import Any
+
+from aiowebostv import WebOsClient, WebOsTvPairError
 
 from homeassistant.components.notify import ATTR_DATA, BaseNotificationService
-from homeassistant.const import CONF_ICON, CONF_NAME
+from homeassistant.const import CONF_ICON
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
 from .const import ATTR_CONFIG_ENTRY_ID, DATA_CONFIG_ENTRY, DOMAIN, WEBOSTV_EXCEPTIONS
 
 _LOGGER = logging.getLogger(__name__)
 
 
-async def async_get_service(hass, _config, discovery_info=None):
+async def async_get_service(
+    hass: HomeAssistant,
+    config: ConfigType,
+    discovery_info: DiscoveryInfoType | None = None,
+) -> BaseNotificationService | None:
     """Return the notify service."""
 
     if discovery_info is None:
         return None
 
-    name = discovery_info.get(CONF_NAME)
     client = hass.data[DOMAIN][DATA_CONFIG_ENTRY][
         discovery_info[ATTR_CONFIG_ENTRY_ID]
     ].client
 
-    return LgWebOSNotificationService(client, name)
+    return LgWebOSNotificationService(client)
 
 
 class LgWebOSNotificationService(BaseNotificationService):
     """Implement the notification service for LG WebOS TV."""
 
-    def __init__(self, client, name):
+    def __init__(self, client: WebOsClient) -> None:
         """Initialize the service."""
-        self._name = name
         self._client = client
 
-    async def async_send_message(self, message="", **kwargs):
+    async def async_send_message(self, message: str = "", **kwargs: Any) -> None:
         """Send a message to the tv."""
         try:
             if not self._client.is_connected():
diff --git a/homeassistant/components/webostv/trigger.py b/homeassistant/components/webostv/trigger.py
index a364c162fd2..1ad7058e1de 100644
--- a/homeassistant/components/webostv/trigger.py
+++ b/homeassistant/components/webostv/trigger.py
@@ -33,7 +33,7 @@ async def async_validate_trigger_config(
 ) -> ConfigType:
     """Validate config."""
     platform = _get_trigger_platform(config)
-    return platform.TRIGGER_SCHEMA(config)
+    return cast(ConfigType, platform.TRIGGER_SCHEMA(config))
 
 
 async def async_attach_trigger(
diff --git a/mypy.ini b/mypy.ini
index 29e87110bf0..9603da1ae04 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -1902,6 +1902,17 @@ no_implicit_optional = true
 warn_return_any = true
 warn_unreachable = true
 
+[mypy-homeassistant.components.webostv.*]
+check_untyped_defs = true
+disallow_incomplete_defs = true
+disallow_subclassing_any = true
+disallow_untyped_calls = true
+disallow_untyped_decorators = true
+disallow_untyped_defs = true
+no_implicit_optional = true
+warn_return_any = true
+warn_unreachable = true
+
 [mypy-homeassistant.components.websocket_api.*]
 check_untyped_defs = true
 disallow_incomplete_defs = true
diff --git a/tests/components/webostv/__init__.py b/tests/components/webostv/__init__.py
index 9fa66cf0863..96c83b33c41 100644
--- a/tests/components/webostv/__init__.py
+++ b/tests/components/webostv/__init__.py
@@ -13,7 +13,7 @@ ENTITY_ID = f"{MP_DOMAIN}.{TV_NAME}"
 MOCK_CLIENT_KEYS = {"1.2.3.4": "some-secret"}
 
 
-async def setup_webostv(hass, unique_id=None):
+async def setup_webostv(hass, unique_id="some-unique-id"):
     """Initialize webostv and media_player for tests."""
     entry = MockConfigEntry(
         domain=DOMAIN,
diff --git a/tests/components/webostv/test_config_flow.py b/tests/components/webostv/test_config_flow.py
index da0dd7f6ba5..a46af19fc04 100644
--- a/tests/components/webostv/test_config_flow.py
+++ b/tests/components/webostv/test_config_flow.py
@@ -119,8 +119,6 @@ async def test_options_flow(hass, client):
     """Test options config flow."""
     entry = await setup_webostv(hass)
 
-    hass.states.async_set("script.test", "off", {"domain": "script"})
-
     result = await hass.config_entries.options.async_init(entry.entry_id)
     await hass.async_block_till_done()
 
@@ -235,7 +233,7 @@ async def test_ssdp_in_progress(hass, client):
 
 async def test_ssdp_update_uuid(hass, client):
     """Test that ssdp updates existing host entry uuid."""
-    entry = await setup_webostv(hass)
+    entry = await setup_webostv(hass, None)
     assert client
     assert entry.unique_id is None
 
@@ -251,7 +249,7 @@ async def test_ssdp_update_uuid(hass, client):
 
 async def test_ssdp_not_update_uuid(hass, client):
     """Test that ssdp not updates different host."""
-    entry = await setup_webostv(hass)
+    entry = await setup_webostv(hass, None)
     assert client
     assert entry.unique_id is None