Annotations: add more annotations to ones with None value. Re #155.

Some module-level variables are initialized to None, including library scan monitor thread, SPLConfig itself, and early metadata announcer timer. Therefore annotate these.

addon/appModules/splstudio/__init__.py

@@ -70,7 +70,7 @@ def new(*args, **kwargs):
 # Threads pool.
 micAlarmT: Optional[threading.Timer] = None
 micAlarmT2 = None
-libScanT = None
+libScanT: Optional[threading.Thread] = None
 
 # Versions of Studio where library scanning functionality is broken.
 noLibScanMonitor: list[str] = []
@@ -670,7 +670,7 @@ class AppModule(appModuleHandler.AppModule):
 
 	# Translators: Script category for StationPlaylist add-on commands in input gestures dialog.
 	scriptCategory = _("StationPlaylist")
-	_focusedTrack = None
+	_focusedTrack: Optional[Any] = None
 	# Monitor Studio API routines.
 	_SPLStudioMonitor = None
 

addon/appModules/splstudio/splbase.py

@@ -4,14 +4,15 @@
 
 # Base services for Studio app module and support modules
 
+from typing import Optional
 import ui
 from winUser import sendMessage, user32
 from logHandler import log
 import addonHandler
 addonHandler.initTranslation()
 
 # Cache the handle to main Studio window.
-_SPLWin = None
+_SPLWin: Optional[int] = None
 
 
 # Check if Studio itself is running.

addon/appModules/splstudio/splconfig.py

@@ -31,7 +31,7 @@
 # Configuration management
 SPLIni = os.path.join(globalVars.appArgs.configPath, "splstudio.ini")
 SPLProfiles = os.path.join(globalVars.appArgs.configPath, "addons", "stationPlaylist", "profiles")
-SPLConfig = None
+SPLConfig: Optional[ConfigHub] = None
 # Cache a copy of the loaded config.
 # This comes in handy when saving configuration to disk. For the most part, no change occurs to config.
 # This helps prolong life of a solid-state drive (preventing unnecessary writes).

addon/appModules/splstudio/splmisc.py

@@ -6,6 +6,7 @@
 
 # #155 (21.03): remove __future__ import when NVDA runs under Python 3.10.
 from __future__ import annotations
+from typing import Optional
 import weakref
 import os
 import threading
@@ -452,7 +453,7 @@ def metadataStatus():
 
 
 # Handle a case where instant profile ssitch occurs twice within the switch time-out.
-_earlyMetadataAnnouncer = None
+_earlyMetadataAnnouncer: Optional[threading.Timer] = None
 
 
 # Internal metadata status announcer.