diff --git a/homeassistant/components/cast/__init__.py b/homeassistant/components/cast/__init__.py
index b0dffcb2e9a..2623de0933e 100644
--- a/homeassistant/components/cast/__init__.py
+++ b/homeassistant/components/cast/__init__.py
@@ -3,10 +3,11 @@ import logging
 
 import voluptuous as vol
 
-from homeassistant import config_entries
+from homeassistant.config_entries import SOURCE_IMPORT, ConfigEntry
 from homeassistant.const import Platform
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers import config_validation as cv
+from homeassistant.helpers.typing import ConfigType
 
 from . import home_assistant_cast
 from .const import DOMAIN
@@ -19,7 +20,7 @@ _LOGGER = logging.getLogger(__name__)
 PLATFORMS = [Platform.MEDIA_PLAYER]
 
 
-async def async_setup(hass, config):
+async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
     """Set up the Cast component."""
     if (conf := config.get(DOMAIN)) is not None:
         media_player_config_validated = []
@@ -36,7 +37,7 @@ async def async_setup(hass, config):
         hass.async_create_task(
             hass.config_entries.flow.async_init(
                 DOMAIN,
-                context={"source": config_entries.SOURCE_IMPORT},
+                context={"source": SOURCE_IMPORT},
                 data=media_player_config_validated,
             )
         )
@@ -44,15 +45,13 @@ async def async_setup(hass, config):
     return True
 
 
-async def async_setup_entry(
-    hass: HomeAssistant, entry: config_entries.ConfigEntry
-) -> bool:
+async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     """Set up Cast from a config entry."""
     await home_assistant_cast.async_setup_ha_cast(hass, entry)
     hass.config_entries.async_setup_platforms(entry, PLATFORMS)
     return True
 
 
-async def async_remove_entry(hass, entry):
+async def async_remove_entry(hass: HomeAssistant, entry: ConfigEntry) -> None:
     """Remove Home Assistant Cast user."""
     await home_assistant_cast.async_remove_user(hass, entry)
diff --git a/homeassistant/components/cast/discovery.py b/homeassistant/components/cast/discovery.py
index e76302fefbc..bc0f1435f8b 100644
--- a/homeassistant/components/cast/discovery.py
+++ b/homeassistant/components/cast/discovery.py
@@ -4,6 +4,7 @@ import threading
 
 import pychromecast
 
+from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import EVENT_HOMEASSISTANT_STOP
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.dispatcher import dispatcher_send
@@ -39,14 +40,14 @@ def discover_chromecast(
     dispatcher_send(hass, SIGNAL_CAST_DISCOVERED, info)
 
 
-def _remove_chromecast(hass: HomeAssistant, info: ChromecastInfo):
+def _remove_chromecast(hass: HomeAssistant, info: ChromecastInfo) -> None:
     # Removed chromecast
     _LOGGER.debug("Removed chromecast %s", info)
 
     dispatcher_send(hass, SIGNAL_CAST_REMOVED, info)
 
 
-def setup_internal_discovery(hass: HomeAssistant, config_entry) -> None:
+def setup_internal_discovery(hass: HomeAssistant, config_entry: ConfigEntry) -> None:
     """Set up the pychromecast internal discovery."""
     if INTERNAL_DISCOVERY_RUNNING_KEY not in hass.data:
         hass.data[INTERNAL_DISCOVERY_RUNNING_KEY] = threading.Lock()
@@ -95,7 +96,7 @@ def setup_internal_discovery(hass: HomeAssistant, config_entry) -> None:
     config_entry.add_update_listener(config_entry_updated)
 
 
-async def config_entry_updated(hass, config_entry):
+async def config_entry_updated(hass: HomeAssistant, config_entry: ConfigEntry) -> None:
     """Handle config entry being updated."""
     browser = hass.data[CAST_BROWSER_KEY]
     browser.host_browser.update_hosts(config_entry.data.get(CONF_KNOWN_HOSTS))
diff --git a/homeassistant/components/cast/media_player.py b/homeassistant/components/cast/media_player.py
index f3cc9c32661..1de98cd79ba 100644
--- a/homeassistant/components/cast/media_player.py
+++ b/homeassistant/components/cast/media_player.py
@@ -45,6 +45,7 @@ from homeassistant.components.media_player.const import (
 )
 from homeassistant.components.plex.const import PLEX_URI_SCHEME
 from homeassistant.components.plex.services import lookup_plex_media
+from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import (
     CAST_APP_ID_HOMEASSISTANT_LOVELACE,
     EVENT_HOMEASSISTANT_STOP,
@@ -57,6 +58,7 @@ from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers import config_validation as cv
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 from homeassistant.helpers.entity import DeviceInfo
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.network import NoURLAvailableError, get_url
 import homeassistant.util.dt as dt_util
 from homeassistant.util.logging import async_create_catching_coro
@@ -121,7 +123,11 @@ def _async_create_cast_device(hass: HomeAssistant, info: ChromecastInfo):
     return CastDevice(info)
 
 
-async def async_setup_entry(hass, config_entry, async_add_entities):
+async def async_setup_entry(
+    hass: HomeAssistant,
+    config_entry: ConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
     """Set up Cast from a config entry."""
     hass.data.setdefault(ADDED_CAST_DEVICES_KEY, set())