diff --git a/homeassistant/components/fail2ban/sensor.py b/homeassistant/components/fail2ban/sensor.py
index 5a7e1052b67..1063dfda08a 100644
--- a/homeassistant/components/fail2ban/sensor.py
+++ b/homeassistant/components/fail2ban/sensor.py
@@ -1,4 +1,6 @@
 """Support for displaying IPs banned by fail2ban."""
+from __future__ import annotations
+
 from datetime import timedelta
 import logging
 import os
@@ -8,7 +10,10 @@ import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA, SensorEntity
 from homeassistant.const import CONF_FILE_PATH, CONF_NAME
+from homeassistant.core import HomeAssistant
 import homeassistant.helpers.config_validation as cv
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -30,10 +35,15 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
 )
 
 
-async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
+async def async_setup_platform(
+    hass: HomeAssistant,
+    config: ConfigType,
+    async_add_entities: AddEntitiesCallback,
+    discovery_info: DiscoveryInfoType | None = None,
+) -> None:
     """Set up the fail2ban sensor."""
-    name = config.get(CONF_NAME)
-    jails = config.get(CONF_JAILS)
+    name = config[CONF_NAME]
+    jails = config[CONF_JAILS]
     log_file = config.get(CONF_FILE_PATH, DEFAULT_LOG)
 
     device_list = []
diff --git a/homeassistant/components/file/sensor.py b/homeassistant/components/file/sensor.py
index 6a18fa4cc8b..b4822c7bcd5 100644
--- a/homeassistant/components/file/sensor.py
+++ b/homeassistant/components/file/sensor.py
@@ -1,4 +1,6 @@
 """Support for sensor value(s) stored in local files."""
+from __future__ import annotations
+
 import logging
 import os
 
@@ -11,7 +13,10 @@ from homeassistant.const import (
     CONF_UNIT_OF_MEASUREMENT,
     CONF_VALUE_TEMPLATE,
 )
+from homeassistant.core import HomeAssistant
 import homeassistant.helpers.config_validation as cv
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -29,10 +34,15 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
 )
 
 
-async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
+async def async_setup_platform(
+    hass: HomeAssistant,
+    config: ConfigType,
+    async_add_entities: AddEntitiesCallback,
+    discovery_info: DiscoveryInfoType | None = None,
+) -> None:
     """Set up the file sensor."""
-    file_path = config.get(CONF_FILE_PATH)
-    name = config.get(CONF_NAME)
+    file_path = config[CONF_FILE_PATH]
+    name = config[CONF_NAME]
     unit = config.get(CONF_UNIT_OF_MEASUREMENT)
 
     if (value_template := config.get(CONF_VALUE_TEMPLATE)) is not None:
diff --git a/homeassistant/components/filesize/sensor.py b/homeassistant/components/filesize/sensor.py
index dc44d3d8255..e409b346c6d 100644
--- a/homeassistant/components/filesize/sensor.py
+++ b/homeassistant/components/filesize/sensor.py
@@ -1,4 +1,6 @@
 """Sensor for monitoring the size of a file."""
+from __future__ import annotations
+
 import datetime
 import logging
 import os
@@ -7,8 +9,11 @@ import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA, SensorEntity
 from homeassistant.const import DATA_MEGABYTES
+from homeassistant.core import HomeAssistant
 import homeassistant.helpers.config_validation as cv
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.reload import setup_reload_service
+from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
 from . import DOMAIN, PLATFORMS
 
@@ -23,13 +28,18 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
 )
 
 
-def setup_platform(hass, config, add_entities, discovery_info=None):
+def setup_platform(
+    hass: HomeAssistant,
+    config: ConfigType,
+    add_entities: AddEntitiesCallback,
+    discovery_info: DiscoveryInfoType | None = None,
+) -> None:
     """Set up the file size sensor."""
 
     setup_reload_service(hass, DOMAIN, PLATFORMS)
 
     sensors = []
-    for path in config.get(CONF_FILE_PATHS):
+    for path in config[CONF_FILE_PATHS]:
         if not hass.config.is_allowed_path(path):
             _LOGGER.error("Filepath %s is not valid or allowed", path)
             continue
diff --git a/homeassistant/components/fints/sensor.py b/homeassistant/components/fints/sensor.py
index a7bec82cee0..4b6cb336bde 100644
--- a/homeassistant/components/fints/sensor.py
+++ b/homeassistant/components/fints/sensor.py
@@ -12,7 +12,10 @@ import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA, SensorEntity
 from homeassistant.const import CONF_NAME, CONF_PIN, CONF_URL, CONF_USERNAME
+from homeassistant.core import HomeAssistant
 import homeassistant.helpers.config_validation as cv
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -51,7 +54,12 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
 )
 
 
-def setup_platform(hass, config, add_entities, discovery_info=None):
+def setup_platform(
+    hass: HomeAssistant,
+    config: ConfigType,
+    add_entities: AddEntitiesCallback,
+    discovery_info: DiscoveryInfoType | None = None,
+) -> None:
     """Set up the sensors.
 
     Login to the bank and get a list of existing accounts. Create a
@@ -72,7 +80,7 @@ def setup_platform(hass, config, add_entities, discovery_info=None):
 
     client = FinTsClient(credentials, fints_name)
     balance_accounts, holdings_accounts = client.detect_accounts()
-    accounts = []
+    accounts: list[SensorEntity] = []
 
     for account in balance_accounts:
         if config[CONF_ACCOUNTS] and account.iban not in account_config:
diff --git a/homeassistant/components/folder/sensor.py b/homeassistant/components/folder/sensor.py
index c7257d40237..bfad45318e6 100644
--- a/homeassistant/components/folder/sensor.py
+++ b/homeassistant/components/folder/sensor.py
@@ -1,4 +1,6 @@
 """Sensor for monitoring the contents of a folder."""
+from __future__ import annotations
+
 from datetime import timedelta
 import glob
 import logging
@@ -8,7 +10,10 @@ import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA, SensorEntity
 from homeassistant.const import DATA_MEGABYTES
+from homeassistant.core import HomeAssistant
 import homeassistant.helpers.config_validation as cv
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -39,14 +44,19 @@ def get_size(files_list):
     return sum(size_list)
 
 
-def setup_platform(hass, config, add_entities, discovery_info=None):
+def setup_platform(
+    hass: HomeAssistant,
+    config: ConfigType,
+    add_entities: AddEntitiesCallback,
+    discovery_info: DiscoveryInfoType | None = None,
+) -> None:
     """Set up the folder sensor."""
-    path = config.get(CONF_FOLDER_PATHS)
+    path = config[CONF_FOLDER_PATHS]
 
     if not hass.config.is_allowed_path(path):
         _LOGGER.error("Folder %s is not valid or allowed", path)
     else:
-        folder = Folder(path, config.get(CONF_FILTER))
+        folder = Folder(path, config[CONF_FILTER])
         add_entities([folder], True)