Enable strict typing for arris_tg2492lg (#106838)

.strict-typing

@@ -78,6 +78,7 @@ homeassistant.components.aprs.*
 homeassistant.components.aqualogic.*
 homeassistant.components.aquostv.*
 homeassistant.components.aranet.*
+homeassistant.components.arris_tg2492lg.*
 homeassistant.components.aruba.*
 homeassistant.components.aseko_pool_live.*
 homeassistant.components.assist_pipeline.*

homeassistant/components/arris_tg2492lg/device_tracker.py

@@ -40,13 +40,13 @@ class ArrisDeviceScanner(DeviceScanner):
         self.connect_box = connect_box
         self.last_results: list[Device] = []
 
-    def scan_devices(self):
+    def scan_devices(self) -> list[str]:
         """Scan for new devices and return a list with found device IDs."""
         self._update_info()
 
-        return [device.mac for device in self.last_results]
+        return [device.mac for device in self.last_results if device.mac]
 
-    def get_device_name(self, device):
+    def get_device_name(self, device: str) -> str | None:
         """Return the name of the given device or None if we don't know."""
         name = next(
             (result.hostname for result in self.last_results if result.mac == device),
@@ -54,12 +54,12 @@ class ArrisDeviceScanner(DeviceScanner):
         )
         return name
 
-    def _update_info(self):
+    def _update_info(self) -> None:
         """Ensure the information from the Arris TG2492LG router is up to date."""
         result = self.connect_box.get_connected_devices()
 
-        last_results = []
-        mac_addresses = set()
+        last_results: list[Device] = []
+        mac_addresses: set[str | None] = set()
 
         for device in result:
             if device.online and device.mac not in mac_addresses:

mypy.ini

@@ -540,6 +540,16 @@ disallow_untyped_defs = true
 warn_return_any = true
 warn_unreachable = true
 
+[mypy-homeassistant.components.arris_tg2492lg.*]
+check_untyped_defs = true
+disallow_incomplete_defs = true
+disallow_subclassing_any = true
+disallow_untyped_calls = true
+disallow_untyped_decorators = true
+disallow_untyped_defs = true
+warn_return_any = true
+warn_unreachable = true
+
 [mypy-homeassistant.components.aruba.*]
 check_untyped_defs = true
 disallow_incomplete_defs = true