Apply type hints to menu scripts

41 files changed, 164 insertions, 162 deletions

diff --git a/game/src/Game/Autoload/Argument/ArgumentOption.gd b/game/src/Game/Autoload/Argument/ArgumentOption.gd
index f98b19c..a9b7000 100644
--- a/game/src/Game/Autoload/Argument/ArgumentOption.gd
+++ b/game/src/Game/Autoload/Argument/ArgumentOption.gd
@@ -17,10 +17,10 @@ extends Resource
 			TYPE_COLOR: default_value = Color()
 			_: default_value = null
 		notify_property_list_changed()
-var default_value
+var default_value : Variant
 @export var description : String
 
-func _init(_name = "", _type = TYPE_NIL, _description = "", default = null):
+func _init(_name := "", _type := TYPE_NIL, _description := "", default : Variant = null) -> void:
 	name = _name
 	type = _type
 	if default != null and typeof(default) == type:
@@ -41,15 +41,17 @@ func get_type_string() -> StringName:
 		TYPE_COLOR: return "color"
 	return "<invalid type>"
 
-func _get(property):
+func _get(property : StringName) -> Variant:
 	if property == "default_value": return default_value
+	return null
 
-func _set(property, value):
+func _set(property : StringName, value : Variant) -> bool:
 	if property == "default_value":
 		default_value = value
 		return true
+	return false
 
-func _get_property_list():
+func _get_property_list() -> Array[Dictionary]:
 	var properties := []
 
 	properties.append({
diff --git a/game/src/Game/Autoload/Argument/ArgumentParser.gd b/game/src/Game/Autoload/Argument/ArgumentParser.gd
index b012215..b3e8632 100644
--- a/game/src/Game/Autoload/Argument/ArgumentParser.gd
+++ b/game/src/Game/Autoload/Argument/ArgumentParser.gd
@@ -46,7 +46,7 @@ const color_name_array : PackedStringArray =[
 
 func has_argument_support(arg_name : StringName, include_aliases : bool = false) -> bool:
 	return option_array.any(
-		func(opt):
+		func(opt : ArgumentOption) -> bool:
 			if include_aliases and arg_name in opt.aliases:
 				return true
 			return opt.name == arg_name
@@ -54,7 +54,7 @@ func has_argument_support(arg_name : StringName, include_aliases : bool = false)
 
 func get_argument(arg_name : StringName, default_val : Variant = null) -> Variant:
 	if ProjectSettings.has_setting(argument_setting_path):
-		var arg_setting = ProjectSettings.get_setting_with_override(argument_setting_path)
+		var arg_setting : Variant = ProjectSettings.get_setting_with_override(argument_setting_path)
 		if not arg_setting is Dictionary:
 			push_error("Argument setting is not a dictionary.")
 			return default_val
@@ -64,7 +64,7 @@ func get_argument(arg_name : StringName, default_val : Variant = null) -> Varian
 
 func set_argument(arg_name : StringName, value : Variant) -> void:
 	if ProjectSettings.has_setting(argument_setting_path):
-		var arg_setting = null
+		var arg_setting : Variant = null
 		arg_setting = ProjectSettings.get_setting_with_override(argument_setting_path)
 		if not arg_setting is Dictionary:
 			push_error("Argument setting is not a dictionary.")
@@ -124,7 +124,7 @@ func _parse_value(arg_name : StringName, value_string : String, type : Variant.T
 		TYPE_RECT2,		\
 		TYPE_RECT2I:
 			push_warning("Value type '%s' may not be supported." % type)
-			var data_array = value_string.lstrip("(").rstrip(")").split(",", false)
+			var data_array := value_string.lstrip("(").rstrip(")").split(",", false)
 			for index in range(data_array.size()):
 				data_array[index] = " " + data_array[index].strip_edges()
 			match type:
@@ -206,7 +206,7 @@ func _parse_argument_list(dictionary : Dictionary, arg_list : PackedStringArray)
 	var current_option : ArgumentOption = null
 	for arg in arg_list:
 		if current_option != null and not arg.begins_with("-"):
-			var result = _parse_value(current_key, arg, current_option.type)
+			var result : Variant = _parse_value(current_key, arg, current_option.type)
 			if result != null:
 				dictionary[current_option.name] = result
 			current_option = null
@@ -229,8 +229,8 @@ func _parse_argument_list(dictionary : Dictionary, arg_list : PackedStringArray)
 						push_warning("Parsing shorthand alias containing '%s', perhaps you meant '--%s'? Skipping argument." % [c, arg])
 						break
 					var alias_found := false
-					for o in option_array:
-						if o.aliases.any(func(v): return c == v):
+					for o : ArgumentOption in option_array:
+						if o.aliases.any(func(v : StringName) -> bool: return c == v):
 							if o.type == TYPE_BOOL:
 								dictionary[o.name] = true
 							else:
@@ -258,7 +258,7 @@ func _parse_argument_list(dictionary : Dictionary, arg_list : PackedStringArray)
 				key = key.substr(1)
 
 			for o in option_array:
-				if key == o.name or o.aliases.any(func(v): return key == v):
+				if key == o.name or o.aliases.any(func(v : StringName) -> bool: return key == v):
 					current_option = o
 					break
 
@@ -268,7 +268,7 @@ func _parse_argument_list(dictionary : Dictionary, arg_list : PackedStringArray)
 
 			current_key = key
 			if first_equal > -1:
-				var arg_result = _parse_value(key, value, current_option.type)
+				var arg_result : Variant = _parse_value(key, value, current_option.type)
 				if arg_result != null:
 					dictionary[current_option.name] = arg_result
 					current_option = null
@@ -279,7 +279,7 @@ func _parse_argument_list(dictionary : Dictionary, arg_list : PackedStringArray)
 
 	return dictionary
 
-func _print_help():
+func _print_help() -> void:
 	var project_name : StringName = ProjectSettings.get_setting_with_override(&"application/config/name")
 	var project_version : String = _GIT_INFO_.tag
 	var project_hash : String = _GIT_INFO_.short_hash
@@ -310,7 +310,7 @@ Options:
 			option.description
 		])
 
-func _ready():
+func _ready() -> void:
 	if Engine.is_editor_hint(): return
 	_set_argument_setting()
 	GameDebug._singleton = GameDebug.new()
diff --git a/game/src/Game/Autoload/Events.gd b/game/src/Game/Autoload/Events.gd
index da29adb..4f38f61 100644
--- a/game/src/Game/Autoload/Events.gd
+++ b/game/src/Game/Autoload/Events.gd
@@ -5,5 +5,5 @@ extends Node
 
 var Options: OptionsEventsObject
 
-func _init():
+func _init() -> void:
 	Options = OptionsEventsObject.new()
diff --git a/game/src/Game/Autoload/Events/Options.gd b/game/src/Game/Autoload/Events/Options.gd
index 726960b..f3fd706 100644
--- a/game/src/Game/Autoload/Events/Options.gd
+++ b/game/src/Game/Autoload/Events/Options.gd
@@ -31,6 +31,6 @@ var _settings_file := ConfigFile.new()
 # * SS-9
 # * UIFUN-7, UIFUN-12
 # * FS-562
-func _init():
+func _init() -> void:
 	if FileAccess.file_exists(_settings_file_path):
 		_settings_file.load(_settings_file_path)
diff --git a/game/src/Game/Autoload/GameLoader.gd b/game/src/Game/Autoload/GameLoader.gd
index 8c14c7e..000ee20 100644
--- a/game/src/Game/Autoload/GameLoader.gd
+++ b/game/src/Game/Autoload/GameLoader.gd
@@ -2,5 +2,5 @@ extends Node
 
 var ShaderManager : ShaderManagerClass
 
-func _init():
+func _init() -> void:
 	ShaderManager = ShaderManagerClass.new()
diff --git a/game/src/Game/Autoload/GuiScale.gd b/game/src/Game/Autoload/GuiScale.gd
index d364ff5..b8af59c 100644
--- a/game/src/Game/Autoload/GuiScale.gd
+++ b/game/src/Game/Autoload/GuiScale.gd
@@ -18,9 +18,9 @@ var _guiscales: Dictionary
 #Similar to Resolution.gd, but we don't bother checking for strings from files
 #and we have floats instead of vector2 integers
 
-func _ready():
+func _ready() -> void:
 	assert(minimum_guiscale > 0, "Minimum gui scale must be positive")
-	for guiscale_value in _starting_guiscales:
+	for guiscale_value : float in _starting_guiscales:
 		add_guiscale(guiscale_value, _starting_guiscales[guiscale_value])
 	assert(not _guiscales.is_empty(), "No valid starting gui scales!")
 
@@ -43,7 +43,7 @@ func add_guiscale(guiscale_value: float, guiscale_name: StringName=&"") -> bool:
 #returns floats
 func get_guiscale_value_list() -> Array:
 	var list := _guiscales.keys()
-	list.sort_custom(func(a, b): return a > b)
+	list.sort_custom(func(a : float, b : float) -> bool: return a > b)
 	return list
 
 func get_guiscale_display_name(guiscale_value : float) -> StringName:
diff --git a/game/src/Game/Autoload/Resolution.gd b/game/src/Game/Autoload/Resolution.gd
index 73169fb..9dddb29 100644
--- a/game/src/Game/Autoload/Resolution.gd
+++ b/game/src/Game/Autoload/Resolution.gd
@@ -27,7 +27,7 @@ var _resolutions : Array[Vector2i]
 const _regex_pattern : String = "(\\d+)\\s*[xX,]\\s*(\\d+)"
 var _regex : RegEx
 
-func _ready():
+func _ready() -> void:
 	assert(minimum_resolution.x > 0 and minimum_resolution.y > 0, "Minimum resolution must be positive!")
 	for resolution_value in _starting_resolutions:
 		add_resolution(resolution_value)
@@ -53,7 +53,7 @@ func get_resolution_value_list() -> Array[Vector2i]:
 	var list : Array[Vector2i] = []
 	# Return a sorted copy instead of a reference to the private array
 	list.append_array(_resolutions)
-	list.sort_custom(func(a, b): return a > b)
+	list.sort_custom(func(a : Vector2i, b : Vector2i) -> bool: return a > b)
 	return list
 
 func get_resolution_value_from_string(resolution_string : String) -> Vector2i:
diff --git a/game/src/Game/Autoload/SaveManager.gd b/game/src/Game/Autoload/SaveManager.gd
index fb7806b..eead63c 100644
--- a/game/src/Game/Autoload/SaveManager.gd
+++ b/game/src/Game/Autoload/SaveManager.gd
@@ -10,7 +10,7 @@ var current_session_tag : StringName
 var _save_dictionary : Dictionary = {}
 var _dirty_save : SaveResource
 
-func _ready():
+func _ready() -> void:
 	var saves_dir_path : String = ProjectSettings.get_setting_with_override(save_directory_setting)
 	assert(saves_dir_path != null, "'%s' setting could not be found." % save_directory_setting)
 
diff --git a/game/src/Game/Autoload/SoundManager.gd b/game/src/Game/Autoload/SoundManager.gd
index c58ce1a..a8a8e80 100644
--- a/game/src/Game/Autoload/SoundManager.gd
+++ b/game/src/Game/Autoload/SoundManager.gd
@@ -11,9 +11,9 @@ var _bus_to_stream_player : Dictionary = {}
 
 # REQUIREMENTS:
 # * SND-10
-func _ready():
-	var dir = DirAccess.open(_audio_directory_path)
-	for fname in dir.get_files():
+func _ready() -> void:
+	var dir := DirAccess.open(_audio_directory_path)
+	for fname : String in dir.get_files():
 		match fname.get_extension():
 			"ogg", "wav", "mp3":
 				_loaded_sound[fname.get_basename()] = load(_audio_directory_path.path_join(fname)) # SND-10
diff --git a/game/src/Game/Autoload/WindowOverride.gd b/game/src/Game/Autoload/WindowOverride.gd
index 837570e..578aee0 100644
--- a/game/src/Game/Autoload/WindowOverride.gd
+++ b/game/src/Game/Autoload/WindowOverride.gd
@@ -2,11 +2,11 @@ extends Node
 
 const VideoOptions = preload("res://src/Game/Menu/OptionMenu/VideoTab.tscn")
 
-func _init():
+func _init() -> void:
 	var window_id := DisplayServer.get_window_list()[0]
 	DisplayServer.window_set_size(Vector2(1280.0, 720.0), window_id)
 
-func _ready():
+func _ready() -> void:
 	if ArgumentParser.get_argument(&"help"): return
 	_on_SceneTree_idle()
 	# Hack to ensure Video Options load
@@ -15,7 +15,7 @@ func _ready():
 	add_child(video)
 	video.queue_free()
 
-func _on_SceneTree_idle():
+func _on_SceneTree_idle() -> void:
 	var window := get_window()
 	window.set_mode(Window.MODE_FULLSCREEN)
 	await get_tree().process_frame
diff --git a/game/src/Game/GameMenu.gd b/game/src/Game/GameMenu.gd
index 8e3239f..974c1d9 100644
--- a/game/src/Game/GameMenu.gd
+++ b/game/src/Game/GameMenu.gd
@@ -7,36 +7,36 @@ extends Control
 
 # REQUIREMENTS
 # * SS-10
-func _ready():
+func _ready() -> void:
 	Events.Options.load_settings_from_file()
 
-func _on_main_menu_new_game_button_pressed():
+func _on_main_menu_new_game_button_pressed() -> void:
 	_lobby_menu.show()
 	_main_menu.hide()
 
 # REQUIREMENTS
 # * SS-6
 # * UIFUN-5
-func _on_main_menu_options_button_pressed():
+func _on_main_menu_options_button_pressed() -> void:
 	_options_menu.show()
 	_main_menu.hide()
 
 
-func _on_options_menu_back_button_pressed():
+func _on_options_menu_back_button_pressed() -> void:
 	_main_menu.show()
 	_options_menu.hide()
 
 
-func _on_lobby_menu_back_button_pressed():
+func _on_lobby_menu_back_button_pressed() -> void:
 	_main_menu.show()
 	_lobby_menu.hide()
 
 
-func _on_credits_back_button_pressed():
+func _on_credits_back_button_pressed() -> void:
 	_credits_menu.hide()
 	_main_menu.show()
 
 
-func _on_main_menu_credits_button_pressed():
+func _on_main_menu_credits_button_pressed() -> void:
 	_credits_menu.show()
 	_main_menu.hide()
diff --git a/game/src/Game/GameStart.gd b/game/src/Game/GameStart.gd
index 32e70c8..4b93077 100644
--- a/game/src/Game/GameStart.gd
+++ b/game/src/Game/GameStart.gd
@@ -41,7 +41,7 @@ func _save_setting(file : ConfigFile) -> void:
 	if file == null: return
 	file.set_value(section_name, setting_name, _settings_base_path)
 
-func _load_compatibility_mode():
+func _load_compatibility_mode() -> void:
 	# Set this to your Vic2 install dir or a mod's dir to enable compatibility mode
 	# (this won't work for mods which rely on vanilla map assets, copy missing assets
 	# into the mod's dir for a temporary fix)
@@ -107,5 +107,5 @@ func _initialize_game() -> void:
 	# change scene in a thread-safe way
 	get_tree().change_scene_to_packed.call_deferred(GameMenuScene)
 
-func _on_splash_container_splash_end():
+func _on_splash_container_splash_end() -> void:
 	loading_screen.show()
diff --git a/game/src/Game/GlobalClass/Localisation.gd b/game/src/Game/GlobalClass/Localisation.gd
index 946dc50..78afb69 100644
--- a/game/src/Game/GlobalClass/Localisation.gd
+++ b/game/src/Game/GlobalClass/Localisation.gd
@@ -23,12 +23,12 @@ static func load_localisation(dir_path : String) -> void:
 # REQUIREMENTS
 # * SS-57
 # * FS-17
-static func initialize():
+static func initialize() -> void:
 	var localisation_dir_path : String = ProjectSettings.get_setting("internationalization/locale/localisation_path", "")
 	if localisation_dir_path.is_empty():
 		push_error("internationalization/locale/localisation_path setting is empty!")
 	else:
 		Localisation.load_localisation(localisation_dir_path)
 
-static func tr_number(num) -> String:
+static func tr_number(num : Variant) -> String:
 	return TextServerManager.get_primary_interface().format_number(str(num))
diff --git a/game/src/Game/LoadingScreen.gd b/game/src/Game/LoadingScreen.gd
index 08cd2a8..c1bfdc6 100644
--- a/game/src/Game/LoadingScreen.gd
+++ b/game/src/Game/LoadingScreen.gd
@@ -22,14 +22,14 @@ func start_loading_screen(thread_safe_function : Callable) -> void:
 
 	thread.start(thread_safe_function)
 
-func try_update_loading_screen(percent_complete: float, quote_should_change = false):
+func try_update_loading_screen(percent_complete: float, quote_should_change := false) -> void:
 	# forces the function to behave as if deferred
 	await get_tree().process_frame
 	progress_bar.value = percent_complete
 	if quote_should_change:
 		quote_label.text = quotes[randi() % quotes.size()]
 
-func _ready():
+func _ready() -> void:
 	if Engine.is_editor_hint(): return
 	thread = Thread.new()
 	# FS-3, UI-30, UIFUN-35
@@ -39,6 +39,6 @@ func _ready():
 		quotes = [""]
 	animation_player.play("loadingscreen_gear")
 
-func _exit_tree():
+func _exit_tree() -> void:
 	if thread != null and thread.is_started():
 		thread.wait_to_finish()
diff --git a/game/src/Game/LocaleButton.gd b/game/src/Game/LocaleButton.gd
index 30a2dab..e315330 100644
--- a/game/src/Game/LocaleButton.gd
+++ b/game/src/Game/LocaleButton.gd
@@ -5,15 +5,15 @@ const setting_name : String = "locale"
 
 var _default_locale_index : int
 
-func _ready():
+func _ready() -> void:
 	var locales_country_rename : Dictionary = ProjectSettings.get_setting("internationalization/locale/country_short_name", {})
 
-	var locales_list = TranslationServer.get_loaded_locales()
+	var locales_list := TranslationServer.get_loaded_locales()
 	var default_locale := Localisation.get_default_locale()
 	if default_locale not in locales_list:
 		locales_list.push_back(default_locale)
 
-	for locale in locales_list:
+	for locale : String in locales_list:
 		# locale_name consists of a compulsory language name and optional script
 		# and country names, in the format: "<language>[ (script)][, country]"
 		var locale_name := TranslationServer.get_locale_name(locale)
@@ -33,7 +33,7 @@ func _ready():
 	Events.Options.load_settings.connect(load_setting)
 	Events.Options.save_settings.connect(save_setting)
 
-func _notification(what : int):
+func _notification(what : int) -> void:
 	match what:
 		NOTIFICATION_TRANSLATION_CHANGED:
 			_select_locale_by_string(TranslationServer.get_locale())
@@ -43,7 +43,7 @@ func _valid_index(index : int) -> bool:
 
 func load_setting(file : ConfigFile) -> void:
 	if file == null: return
-	var load_value = file.get_value(section_name, setting_name, Localisation.get_default_locale())
+	var load_value : Variant = file.get_value(section_name, setting_name, Localisation.get_default_locale())
 	match typeof(load_value):
 		TYPE_STRING, TYPE_STRING_NAME:
 			if _select_locale_by_string(load_value as String):
diff --git a/game/src/Game/Menu/CreditsMenu/CreditsMenu.gd b/game/src/Game/Menu/CreditsMenu/CreditsMenu.gd
index 61140c0..2f1e867 100644
--- a/game/src/Game/Menu/CreditsMenu/CreditsMenu.gd
+++ b/game/src/Game/Menu/CreditsMenu/CreditsMenu.gd
@@ -43,7 +43,7 @@ const title_key : String = "TITLE"
 # * FS-4
 func _load_credit_file(path : String) -> Dictionary:
 	var roles := {}
-	var core_credits = FileAccess.open(path, FileAccess.READ)
+	var core_credits := FileAccess.open(path, FileAccess.READ)
 	if core_credits == null:
 		push_error("Failed to open credits file %s (error code %d)" % [path, FileAccess.get_open_error()])
 		return roles
@@ -79,7 +79,7 @@ func _load_credit_file(path : String) -> Dictionary:
 			roles[title_key] = [roles[title_key][0]]
 	else:
 		push_warning("Credits file %s missing %s" % [path, title_key])
-	for role_list in roles.values():
+	for role_list : Array in roles.values():
 		role_list.sort_custom(func(a : String, b : String) -> bool: return a.naturalnocasecmp_to(b) < 0)
 	return roles
 
@@ -94,7 +94,7 @@ func _add_label(node : Node, text : String, type_variation : StringName) -> void
 # REQUIREMENTS:
 # * UI-34, UI-35
 func _add_project_credits(project : Dictionary) -> void:
-	var project_credits_list = VBoxContainer.new()
+	var project_credits_list := VBoxContainer.new()
 	project_credits_list.name = 'Credits'
 	if title_key in project:
 		var title : String = project[title_key][0]
@@ -102,13 +102,13 @@ func _add_project_credits(project : Dictionary) -> void:
 		_add_label(project_credits_list, title, label_variants_project)
 		project_credits_list.add_child(HSeparator.new())
 
-	for role in project:
+	for role : String in project:
 		if role == title_key:
 			continue
 
-		var role_parent = VBoxContainer.new()
+		var role_parent := VBoxContainer.new()
 
-		for person in project[role]:
+		for person : String in project[role]:
 			_add_label(role_parent, person, label_variants_person)
 
 		_add_label(project_credits_list, role, label_variants_role)
@@ -118,19 +118,19 @@ func _add_project_credits(project : Dictionary) -> void:
 	credits_list.add_child(project_credits_list)
 
 func _add_godot_credits() -> void:
-	var godot_credits_list = VBoxContainer.new()
+	var godot_credits_list := VBoxContainer.new()
 	godot_credits_list.name = 'CreditsGodot'
-	var godot_engine = godot_engine_scene.instantiate()
+	var godot_engine := godot_engine_scene.instantiate()
 	godot_credits_list.add_child(godot_engine)
 	godot_credits_list.add_child(HSeparator.new())
 
 	var author_dict := Engine.get_author_info()
 	_add_label(godot_credits_list, "Contributors", label_variants_role)
 
-	for role in author_dict:
-		var role_parent = VBoxContainer.new()
+	for role : String in author_dict:
+		var role_parent := VBoxContainer.new()
 
-		for person in author_dict[role]:
+		for person : String in author_dict[role]:
 			_add_label(role_parent, person, label_variants_person)
 
 		_add_label(godot_credits_list, role.replace("_", " ").capitalize(), label_variants_role)
@@ -140,11 +140,11 @@ func _add_godot_credits() -> void:
 	var donor_dict := Engine.get_donor_info()
 	_add_label(godot_credits_list, "Donors", label_variants_role)
 
-	for role in donor_dict:
+	for role : String in donor_dict:
 		if donor_dict[role].size() == 0 or donor_dict[role][0].begins_with("None"): continue
-		var role_parent = VBoxContainer.new()
+		var role_parent := VBoxContainer.new()
 
-		for person in donor_dict[role]:
+		for person : String in donor_dict[role]:
 			_add_label(role_parent, person, label_variants_person)
 
 		_add_label(godot_credits_list, role.replace("_", " ").capitalize(), label_variants_role)
@@ -163,7 +163,7 @@ func _add_link_button(node : Node, text : String, url: String, type_variation :
 	node.add_child(button)
 
 func _add_licenses() -> void:
-	var license_list = VBoxContainer.new()
+	var license_list := VBoxContainer.new()
 	license_list.name = 'Licenses'
 	_add_label(license_list, "Third-Party Licenses", label_variants_project)
 	license_list.add_child(HSeparator.new())
@@ -178,7 +178,7 @@ func _add_licenses() -> void:
 	# Add additional licenses required for attribution here
 	# These licenses should also either be displayed or exported alongside this project
 
-	for project in license_info:
+	for project : String in license_info:
 		_add_label(license_list, project, label_variants_role)
 		_add_link_button(license_list, license_info[project][0], license_info[project][1], label_variants_person)
 		license_list.add_child(HSeparator.new())
@@ -188,12 +188,12 @@ func _add_licenses() -> void:
 
 # REQUIREMENTS:
 # * SS-17
-func _ready():
+func _ready() -> void:
 	_add_project_credits(_load_credit_file(core_credits_path))
 	_add_godot_credits()
 	_add_licenses()
 
-func _input(event):
+func _input(event : InputEvent) -> void:
 	if self.is_visible_in_tree():
 		if event.is_action_pressed("ui_cancel"):
 			_on_back_button_pressed()
diff --git a/game/src/Game/Menu/CreditsMenu/GodotEngineButton.gd b/game/src/Game/Menu/CreditsMenu/GodotEngineButton.gd
index ca3a958..f8d6dd3 100644
--- a/game/src/Game/Menu/CreditsMenu/GodotEngineButton.gd
+++ b/game/src/Game/Menu/CreditsMenu/GodotEngineButton.gd
@@ -1,4 +1,4 @@
 extends Button
 
-func _on_pressed():
+func _on_pressed() -> void:
 	OS.shell_open("https://godotengine.org")
diff --git a/game/src/Game/Menu/LobbyMenu/LobbyMenu.gd b/game/src/Game/Menu/LobbyMenu/LobbyMenu.gd
index 3c857fe..cc681ba 100644
--- a/game/src/Game/Menu/LobbyMenu/LobbyMenu.gd
+++ b/game/src/Game/Menu/LobbyMenu/LobbyMenu.gd
@@ -46,7 +46,7 @@ var _id_to_tag : Array[StringName] = []
 # * FS-8
 func _build_save_list() -> void:
 	game_select_save_tab.add_tab("GAMELOBBY_SELECT_ALL")
-	for save_name in SaveManager._save_dictionary:
+	for save_name : StringName in SaveManager._save_dictionary:
 		var save : SaveResource = SaveManager._save_dictionary[save_name]
 		var save_node := _create_save_node(save)
 		game_select_save_list.add_child(save_node)
@@ -55,16 +55,16 @@ func _build_save_list() -> void:
 			game_select_save_tab.add_tab(save.session_tag)
 
 func _create_save_node(resource : SaveResource) -> Control:
-	var save_node = save_scene.instantiate()
+	var save_node := save_scene.instantiate()
 	save_node.resource = resource
 	save_node.pressed.connect(_on_save_node_pressed.bind(save_node))
 	save_node.request_to_delete.connect(_on_save_node_delete_requested.bind(save_node))
 	return save_node
 
 func _queue_clear_lists() -> void:
-	var full_list = game_select_start_date.get_children()
+	var full_list := game_select_start_date.get_children()
 	full_list.append_array(game_select_save_list.get_children())
-	for child in full_list:
+	for child : Node in full_list:
 		child.queue_free()
 	game_select_save_tab.clear_tabs()
 	_id_to_tag.clear()
@@ -72,7 +72,7 @@ func _queue_clear_lists() -> void:
 # REQUIREMENTS:
 # * SS-16
 # * UIFUN-40
-func _on_back_button_button_down():
+func _on_back_button_button_down() -> void:
 	print("Returning to Main Menu.")
 	SaveManager.current_session_tag = ""
 	SaveManager.current_save = null
@@ -80,7 +80,7 @@ func _on_back_button_button_down():
 
 # REQUIREMENTS:
 # * SS-21
-func _on_start_button_pressed():
+func _on_start_button_pressed() -> void:
 	print("Starting new game.")
 	if SaveManager.current_session_tag == "":
 		# TODO: Get country tag as well
@@ -102,20 +102,20 @@ func _on_start_button_pressed():
 
 # REQUIREMENTS:
 # * SS-19
-func _on_game_select_list_item_selected(index):
+func _on_game_select_list_item_selected(index) -> void:
 	print("Selected save game: ", index)
 	save_game_selected.emit(index)
 
 # If the date is double-clicked, start the game!
-func _on_game_select_list_item_activated(index):
+func _on_game_select_list_item_activated(index) -> void:
 	_on_game_select_list_item_selected(index)
 	_on_start_button_pressed()
 
-func _on_session_tag_edit_text_submitted(new_text):
+func _on_session_tag_edit_text_submitted(new_text : String) -> void:
 	SaveManager.current_session_tag = new_text
 	_on_start_button_pressed()
 
-func _on_session_tag_dialog_confirmed():
+func _on_session_tag_dialog_confirmed() -> void:
 	get_tree().change_scene_to_file("res://src/Game/GameSession/GameSession.tscn")
 
 var _requested_node_to_delete : Control
@@ -147,17 +147,17 @@ func _on_save_node_pressed(node : Control) -> void:
 	start_button.disabled = false
 	save_game_selected.emit(SaveManager.current_save)
 
-func _on_game_select_save_tab_tab_changed(tab) -> void:
+func _on_game_select_save_tab_tab_changed(tab : int) -> void:
 	if tab == 0:
 		filter_for_tag(&"")
 	else:
 		filter_for_tag(_id_to_tag[tab - 1])
 
-func _on_delete_dialog_confirmed():
+func _on_delete_dialog_confirmed() -> void:
 	_requested_node_to_delete.resource.delete()
 	_requested_node_to_delete.queue_free()
 
-func _on_visibility_changed():
+func _on_visibility_changed() -> void:
 	if visible:
 		_build_date_list()
 		_build_save_list()
diff --git a/game/src/Game/Menu/LobbyMenu/LobbyPanelButton.gd b/game/src/Game/Menu/LobbyMenu/LobbyPanelButton.gd
index 5f3ea46..646c694 100644
--- a/game/src/Game/Menu/LobbyMenu/LobbyPanelButton.gd
+++ b/game/src/Game/Menu/LobbyMenu/LobbyPanelButton.gd
@@ -73,7 +73,7 @@ func _get_draw_mode_style() -> StyleBox:
 		return background_button.get_theme_stylebox(_get_draw_mode_name(false))
 	return result
 
-func _notification(what) -> void:
+func _notification(what : int) -> void:
 	if what == NOTIFICATION_SORT_CHILDREN:
 		var _size := size
 		var offset := Vector2()
@@ -89,14 +89,14 @@ func _notification(what) -> void:
 
 			fit_child_in_rect(child, Rect2(offset, _size))
 
-func _on_background_button_button_down():
+func _on_background_button_button_down() -> void:
 	button_down.emit()
 
-func _on_background_button_button_up():
+func _on_background_button_button_up() -> void:
 	button_up.emit()
 
-func _on_background_button_pressed():
+func _on_background_button_pressed() -> void:
 	pressed.emit()
 
-func _on_background_button_toggled(button_pressed : bool):
+func _on_background_button_toggled(button_pressed : bool) -> void:
 	toggled.emit(button_pressed)
diff --git a/game/src/Game/Menu/MainMenu/MainMenu.gd b/game/src/Game/Menu/MainMenu/MainMenu.gd
index 9d0edc6..cc8841f 100644
--- a/game/src/Game/Menu/MainMenu/MainMenu.gd
+++ b/game/src/Game/Menu/MainMenu/MainMenu.gd
@@ -9,42 +9,42 @@ var _new_game_button : BaseButton
 
 # REQUIREMENTS:
 # * SS-3
-func _ready():
+func _ready() -> void:
 	_on_new_game_button_visibility_changed()
 
 # REQUIREMENTS:
 # * SS-14
 # * UIFUN-32
-func _on_new_game_button_pressed():
+func _on_new_game_button_pressed() -> void:
 	print("Start a new game!")
 	new_game_button_pressed.emit()
 
 
-func _on_continue_button_pressed():
+func _on_continue_button_pressed() -> void:
 	print("Continue last game!")
 
 
-func _on_multi_player_button_pressed():
+func _on_multi_player_button_pressed() -> void:
 	print("Have fun with friends!")
 
 
-func _on_options_button_pressed():
+func _on_options_button_pressed() -> void:
 	print("Check out some options!")
 	options_button_pressed.emit()
 
 # REQUIREMENTS
 # * UI-32
 # * UIFUN-36
-func _on_credits_button_pressed():
+func _on_credits_button_pressed() -> void:
 	credits_button_pressed.emit()
 
 # REQUIREMENTS
 # * SS-4
 # * UIFUN-3
-func _on_exit_button_pressed():
+func _on_exit_button_pressed() -> void:
 	print("See you later!")
 	get_tree().quit()
 
-func _on_new_game_button_visibility_changed():
+func _on_new_game_button_visibility_changed() -> void:
 	if visible:
 		_new_game_button.grab_focus.call_deferred()
diff --git a/game/src/Game/Menu/MainMenu/ReleaseInfoBox.gd b/game/src/Game/Menu/MainMenu/ReleaseInfoBox.gd
index f401919..c52503c 100644
--- a/game/src/Game/Menu/MainMenu/ReleaseInfoBox.gd
+++ b/game/src/Game/Menu/MainMenu/ReleaseInfoBox.gd
@@ -14,7 +14,7 @@ var _checksum : String = "????"
 # REQUIREMENTS:
 # * SS-104, SS-105, SS-106, SS-107
 # * UIFUN-97, UIFUN-297, UIFUN-299
-func _ready():
+func _ready() -> void:
 	_version_label.text = _GIT_INFO_.release_name
 	_version_label.tooltip_text = _GIT_INFO_.tag
 	_commit_label.text = _GIT_INFO_.short_hash
@@ -23,7 +23,7 @@ func _ready():
 	_checksum = Checksum.get_checksum_text()
 	_update_checksum_label_text()
 
-func _notification(what : int):
+func _notification(what : int) -> void:
 	match what:
 		NOTIFICATION_TRANSLATION_CHANGED:
 			_update_checksum_label_text()
@@ -32,11 +32,11 @@ func _update_checksum_label_text() -> void:
 	_checksum_label.tooltip_text = tr("MAINMENU_CHECKSUM").format({ "checksum": _checksum })
 	_checksum_label.text = "(%s)" % _checksum.substr(0, 4)
 
-func _on_version_label_pressed():
+func _on_version_label_pressed() -> void:
 	DisplayServer.clipboard_set(_GIT_INFO_.tag)
 
-func _on_commit_label_pressed():
+func _on_commit_label_pressed() -> void:
 	DisplayServer.clipboard_set(_GIT_INFO_.commit_hash)
 
-func _on_checksum_label_pressed():
+func _on_checksum_label_pressed() -> void:
 	DisplayServer.clipboard_set(_checksum)
diff --git a/game/src/Game/Menu/OptionMenu/GuiScaleSelector.gd b/game/src/Game/Menu/OptionMenu/GuiScaleSelector.gd
index 42be5e0..3be8c2c 100644
--- a/game/src/Game/Menu/OptionMenu/GuiScaleSelector.gd
+++ b/game/src/Game/Menu/OptionMenu/GuiScaleSelector.gd
@@ -17,7 +17,7 @@ func _sync_guiscales(to_select : float = GuiScale.get_current_guiscale()) -> voi
 	clear()
 	default_selected = -1
 	selected = -1
-	for guiscale_value in GuiScale.get_guiscale_value_list():
+	for guiscale_value : float in GuiScale.get_guiscale_value_list():
 		add_item(GuiScale.get_guiscale_display_name(guiscale_value))
 		set_item_metadata(item_count - 1, guiscale_value)
 
@@ -33,7 +33,7 @@ func _sync_guiscales(to_select : float = GuiScale.get_current_guiscale()) -> voi
 	if selected == -1:
 		selected = default_selected
 
-func _setup_button():
+func _setup_button() -> void:
 	if default_value <= 0:
 		default_value = ProjectSettings.get_setting("display/window/stretch/scale")
 	GuiScale.add_guiscale(default_value, &"default")
@@ -45,7 +45,7 @@ func _get_value_for_file(select_value : int):
 	else:
 		return null
 
-func _set_value_from_file(load_value):
+func _set_value_from_file(load_value : Variant) -> void:
 	if typeof(load_value) == TYPE_FLOAT:
 		var target_guiscale : float = load_value
 		selected = _find_guiscale_index_by_value(target_guiscale)
@@ -56,7 +56,7 @@ func _set_value_from_file(load_value):
 	push_error("Setting value '%s' invalid for setting [%s] %s" % [load_value, section_name, setting_name])
 	selected = default_selected
 
-func _on_option_selected(index : int, by_user : bool):
+func _on_option_selected(index : int, by_user : bool) -> void:
 	if _valid_index(index):
 		GuiScale.set_guiscale(get_item_metadata(index))
 	else:
diff --git a/game/src/Game/Menu/OptionMenu/MonitorDisplaySelector.gd b/game/src/Game/Menu/OptionMenu/MonitorDisplaySelector.gd
index c3beaf6..a535f17 100644
--- a/game/src/Game/Menu/OptionMenu/MonitorDisplaySelector.gd
+++ b/game/src/Game/Menu/OptionMenu/MonitorDisplaySelector.gd
@@ -8,7 +8,7 @@ func _setup_button() -> void:
 	_update_monitor_options_text()
 	default_selected = Resolution.get_current_monitor()
 
-func _notification(what : int):
+func _notification(what : int) -> void:
 	match what:
 		NOTIFICATION_TRANSLATION_CHANGED:
 			_update_monitor_options_text()
diff --git a/game/src/Game/Menu/OptionMenu/OptionsMenu.gd b/game/src/Game/Menu/OptionMenu/OptionsMenu.gd
index 93ef3e4..2b70d1c 100644
--- a/game/src/Game/Menu/OptionMenu/OptionsMenu.gd
+++ b/game/src/Game/Menu/OptionMenu/OptionsMenu.gd
@@ -7,7 +7,7 @@ signal back_button_pressed
 
 @export var _tab_container : TabContainer
 
-func _ready():
+func _ready() -> void:
 	_tab_container.set_tab_title(0, "OPTIONS_GENERAL")
 	_tab_container.set_tab_title(1, "OPTIONS_VIDEO")
 	_tab_container.set_tab_title(2, "OPTIONS_SOUND")
@@ -41,19 +41,19 @@ func _ready():
 	button_list.add_child(back_button)
 	get_viewport().get_window().close_requested.connect(_on_window_close_requested)
 	_save_overrides.call_deferred()
-	Events.Options.save_settings.connect(func(_f): self._save_overrides.call_deferred())
+	Events.Options.save_settings.connect(func(_f : ConfigFile) -> void: self._save_overrides.call_deferred())
 
-func _notification(what):
+func _notification(what : int) -> void:
 	match what:
 		NOTIFICATION_CRASH:
 			_on_window_close_requested()
 
-func _input(event):
+func _input(event : InputEvent) -> void:
 	if self.is_visible_in_tree():
 		if event.is_action_pressed("ui_cancel"):
 			_on_back_button_pressed()
 
-func _on_back_button_pressed():
+func _on_back_button_pressed() -> void:
 	Events.Options.save_settings_to_file()
 	back_button_pressed.emit()
 
diff --git a/game/src/Game/Menu/OptionMenu/QualityPresetSelector.gd b/game/src/Game/Menu/OptionMenu/QualityPresetSelector.gd
index 57ba4ab..4fb02a6 100644
--- a/game/src/Game/Menu/OptionMenu/QualityPresetSelector.gd
+++ b/game/src/Game/Menu/OptionMenu/QualityPresetSelector.gd
@@ -1,4 +1,4 @@
 extends SettingOptionButton
 
-func _setup_button():
+func _setup_button() -> void:
 	pass
diff --git a/game/src/Game/Menu/OptionMenu/RefreshRateSelector.gd b/game/src/Game/Menu/OptionMenu/RefreshRateSelector.gd
index 31b115b..d66833e 100644
--- a/game/src/Game/Menu/OptionMenu/RefreshRateSelector.gd
+++ b/game/src/Game/Menu/OptionMenu/RefreshRateSelector.gd
@@ -1,5 +1,5 @@
 extends SettingOptionButton
 
 
-func _setup_button():
+func _setup_button() -> void:
 	pass
diff --git a/game/src/Game/Menu/OptionMenu/ResolutionSelector.gd b/game/src/Game/Menu/OptionMenu/ResolutionSelector.gd
index cb7a1fb..1a21211 100644
--- a/game/src/Game/Menu/OptionMenu/ResolutionSelector.gd
+++ b/game/src/Game/Menu/OptionMenu/ResolutionSelector.gd
@@ -34,7 +34,7 @@ func _sync_resolutions() -> void:
 		selected = default_selected
 	_update_resolution_options_text()
 
-func _notification(what : int):
+func _notification(what : int) -> void:
 	match what:
 		NOTIFICATION_TRANSLATION_CHANGED:
 			_update_resolution_options_text()
@@ -56,7 +56,7 @@ func _update_resolution_options_text() -> void:
 		set_item_text(index, display_name)
 
 func _setup_button() -> void:
-	Resolution.resolution_added.connect(func (_value : Vector2i): _sync_resolutions())
+	Resolution.resolution_added.connect(func (_value : Vector2i) -> void: _sync_resolutions())
 	if default_value.x <= 0:
 		default_value.x = ProjectSettings.get_setting("display/window/size/viewport_width")
 	if default_value.y <= 0:
@@ -66,7 +66,7 @@ func _setup_button() -> void:
 	else:
 		_sync_resolutions()
 
-func _get_value_for_file(select_value : int) -> Variant:
+func _get_value_for_file(select_value : int):
 	if _valid_index(select_value):
 		return get_item_metadata(select_value)
 	else:
@@ -74,7 +74,7 @@ func _get_value_for_file(select_value : int) -> Variant:
 
 # REQUIREMENTS:
 # * SS-25
-func _set_value_from_file(load_value) -> void:
+func _set_value_from_file(load_value : Variant) -> void:
 	var target_resolution := Resolution.error_resolution
 	match typeof(load_value):
 		TYPE_VECTOR2I: target_resolution = load_value
diff --git a/game/src/Game/Menu/OptionMenu/ScreenModeSelector.gd b/game/src/Game/Menu/OptionMenu/ScreenModeSelector.gd
index 0d1836c..84ec9c9 100644
--- a/game/src/Game/Menu/OptionMenu/ScreenModeSelector.gd
+++ b/game/src/Game/Menu/OptionMenu/ScreenModeSelector.gd
@@ -28,7 +28,7 @@ func get_window_mode_from_screen_mode(screen_mode : ScreenMode) -> Window.Mode:
 		_:
 			return Window.MODE_EXCLUSIVE_FULLSCREEN
 
-func _setup_button():
+func _setup_button() -> void:
 	default_selected = get_screen_mode_from_window_mode(Resolution.get_current_window_mode())
 	selected = default_selected
 
diff --git a/game/src/Game/Menu/OptionMenu/SettingNodes/SettingCheckBox.gd b/game/src/Game/Menu/OptionMenu/SettingNodes/SettingCheckBox.gd
index 344a2b5..46fe4d7 100644
--- a/game/src/Game/Menu/OptionMenu/SettingNodes/SettingCheckBox.gd
+++ b/game/src/Game/Menu/OptionMenu/SettingNodes/SettingCheckBox.gd
@@ -15,14 +15,14 @@ var default_pressed : bool = true
 func _setup_button() -> void:
 	pass
 
-func _ready():
+func _ready() -> void:
 	Events.Options.load_settings.connect(load_setting)
 	Events.Options.save_settings.connect(save_setting)
 	Events.Options.reset_settings.connect(reset_setting)
-	toggled.connect(func(p : bool): option_selected.emit(p, true))
+	toggled.connect(func(p : bool) -> void: option_selected.emit(p, true))
 	_setup_button()
 
-func _set_value_from_file(load_value) -> void:
+func _set_value_from_file(load_value : Variant) -> void:
 	match typeof(load_value):
 		TYPE_BOOL, TYPE_INT:
 			set_pressed_no_signal(load_value as bool)
diff --git a/game/src/Game/Menu/OptionMenu/SettingNodes/SettingHSlider.gd b/game/src/Game/Menu/OptionMenu/SettingNodes/SettingHSlider.gd
index 6fa30ed..a728ba0 100644
--- a/game/src/Game/Menu/OptionMenu/SettingNodes/SettingHSlider.gd
+++ b/game/src/Game/Menu/OptionMenu/SettingNodes/SettingHSlider.gd
@@ -10,14 +10,14 @@ var setting_name : String = "setting_hslider"
 @export
 var default_value : float = 0
 
-func _ready():
+func _ready() -> void:
 	Events.Options.load_settings.connect(load_setting)
 	Events.Options.save_settings.connect(save_setting)
 	Events.Options.reset_settings.connect(reset_setting)
 
-func load_setting(file : ConfigFile):
+func load_setting(file : ConfigFile) -> void:
 	if file == null: return
-	var load_value = file.get_value(section_name, setting_name, default_value)
+	var load_value : Variant = file.get_value(section_name, setting_name, default_value)
 	match typeof(load_value):
 		TYPE_FLOAT, TYPE_INT:
 			if value == load_value: value_changed.emit(value)
@@ -33,9 +33,9 @@ func load_setting(file : ConfigFile):
 	push_error("Setting value '%s' invalid for setting [%s] \"%s\"" % [load_value, section_name, setting_name])
 	value = default_value
 
-func save_setting(file : ConfigFile):
+func save_setting(file : ConfigFile) -> void:
 	if file == null: return
 	file.set_value(section_name, setting_name, value)
 
-func reset_setting():
+func reset_setting() -> void:
 	value = default_value
diff --git a/game/src/Game/Menu/OptionMenu/SettingNodes/SettingOptionButton.gd b/game/src/Game/Menu/OptionMenu/SettingNodes/SettingOptionButton.gd
index 079dd4d..a972ed6 100644
--- a/game/src/Game/Menu/OptionMenu/SettingNodes/SettingOptionButton.gd
+++ b/game/src/Game/Menu/OptionMenu/SettingNodes/SettingOptionButton.gd
@@ -21,13 +21,13 @@ var default_selected : int = -1:
 func _valid_index(index : int) -> bool:
 	return 0 <= index and index < item_count
 
-func _get_value_for_file(select_value : int):
+func _get_value_for_file(select_value : int) -> Variant:
 	if _valid_index(select_value):
 		return select_value
 	else:
 		return null
 
-func _set_value_from_file(load_value) -> void:
+func _set_value_from_file(load_value : Variant) -> void:
 	match typeof(load_value):
 		TYPE_INT:
 			if _valid_index(load_value):
@@ -50,11 +50,11 @@ func _set_value_from_file(load_value) -> void:
 func _setup_button() -> void:
 	pass
 
-func _ready():
+func _ready() -> void:
 	Events.Options.load_settings.connect(load_setting)
 	Events.Options.save_settings.connect(save_setting)
 	Events.Options.reset_settings.connect(reset_setting)
-	item_selected.connect(func(index : int): option_selected.emit(index, true))
+	item_selected.connect(func(index : int) -> void: option_selected.emit(index, true))
 	_setup_button()
 	if not _valid_index(default_selected) or selected == -1:
 		var msg := "Failed to generate any valid %s %s options." % [setting_name, section_name]
diff --git a/game/src/Game/Menu/OptionMenu/SettingNodes/SettingRevertButton.gd b/game/src/Game/Menu/OptionMenu/SettingNodes/SettingRevertButton.gd
index 431e3e5..6785f73 100644
--- a/game/src/Game/Menu/OptionMenu/SettingNodes/SettingRevertButton.gd
+++ b/game/src/Game/Menu/OptionMenu/SettingNodes/SettingRevertButton.gd
@@ -6,7 +6,7 @@ class_name SettingRevertButton
 
 var previous_index : int = -1
 
-func _ready():
+func _ready() -> void:
 	super()
 	if revert_dialog != null:
 		revert_dialog.visibility_changed.connect(_on_revert_dialog_visibility_changed)
diff --git a/game/src/Game/Menu/OptionMenu/SettingRevertDialog.gd b/game/src/Game/Menu/OptionMenu/SettingRevertDialog.gd
index 5e2b81f..7928d15 100644
--- a/game/src/Game/Menu/OptionMenu/SettingRevertDialog.gd
+++ b/game/src/Game/Menu/OptionMenu/SettingRevertDialog.gd
@@ -16,12 +16,12 @@ func show_dialog(button : SettingRevertButton, time : float = 0) -> void:
 	popup_centered(Vector2(1,1))
 	_revert_node = button
 
-func _notification(what):
+func _notification(what : int) -> void:
 	if what == NOTIFICATION_VISIBILITY_CHANGED:
 		set_process(visible)
 		if not visible: _revert_node = null
 
-func _process(_delta) -> void:
+func _process(_delta : float) -> void:
 	dialog_text = tr(dialog_text_key).format({ "time": Localisation.tr_number(int(timer.time_left)) })
 
 func _on_canceled_or_close_requested() -> void:
diff --git a/game/src/Game/Menu/OptionMenu/SoundTab.gd b/game/src/Game/Menu/OptionMenu/SoundTab.gd
index d1daf3d..a84af70 100644
--- a/game/src/Game/Menu/OptionMenu/SoundTab.gd
+++ b/game/src/Game/Menu/OptionMenu/SoundTab.gd
@@ -2,5 +2,5 @@ extends HBoxContainer
 
 @export var _startup_music_button : SettingCheckBox
 
-func _ready():
-	_startup_music_button.option_selected.connect(func (pressed : bool, _by_user : bool): MusicConductor.set_startup_music(pressed))
+func _ready() -> void:
+	_startup_music_button.option_selected.connect(func (pressed : bool, _by_user : bool) -> void: MusicConductor.set_startup_music(pressed))
diff --git a/game/src/Game/Menu/OptionMenu/VolumeGrid.gd b/game/src/Game/Menu/OptionMenu/VolumeGrid.gd
index 46613b4..cce231f 100644
--- a/game/src/Game/Menu/OptionMenu/VolumeGrid.gd
+++ b/game/src/Game/Menu/OptionMenu/VolumeGrid.gd
@@ -39,7 +39,7 @@ func add_volume_row(bus_name : String, bus_index : int) -> HSlider:
 
 # REQUIREMENTS
 # * UI-22
-func _ready():
+func _ready() -> void:
 	for bus_index in AudioServer.bus_count:
 		add_volume_row(AudioServer.get_bus_name(bus_index), bus_index)
 
@@ -54,17 +54,17 @@ func _on_slider_value_changed(value : float, bus_index : int) -> void:
 	AudioServer.set_bus_volume_db(bus_index, get_volume_value_as_db(value))
 
 
-func _on_options_menu_load_settings(load_file : ConfigFile):
-	for volume_slider in _slider_dictionary.values():
+func _on_options_menu_load_settings(load_file : ConfigFile) -> void:
+	for volume_slider : SettingHSlider in _slider_dictionary.values():
 		volume_slider.load_setting(load_file)
 
 # REQUIREMENTS
 # * UIFUN-23
-func _on_options_menu_save_settings(save_file : ConfigFile):
-	for volume_slider in _slider_dictionary.values():
+func _on_options_menu_save_settings(save_file : ConfigFile) -> void:
+	for volume_slider : SettingHSlider in _slider_dictionary.values():
 		volume_slider.save_setting(save_file)
 
 
-func _on_options_menu_reset_settings():
-	for volume_slider in _slider_dictionary.values():
+func _on_options_menu_reset_settings() -> void:
+	for volume_slider : SettingHSlider in _slider_dictionary.values():
 		volume_slider.reset_setting()
diff --git a/game/src/Game/Menu/SaveLoadMenu/SavePanelButton.gd b/game/src/Game/Menu/SaveLoadMenu/SavePanelButton.gd
index 5fe4917..6dc43c9 100644
--- a/game/src/Game/Menu/SaveLoadMenu/SavePanelButton.gd
+++ b/game/src/Game/Menu/SaveLoadMenu/SavePanelButton.gd
@@ -26,7 +26,7 @@ func set_text(value : StringName) -> void:
 	if resource != null:
 		resource.save_name = value
 
-func _ready():
+func _ready() -> void:
 	_resource_changed()
 
 func _is_start_date() -> bool:
diff --git a/game/src/Game/Menu/SaveLoadMenu/SaveResource.gd b/game/src/Game/Menu/SaveLoadMenu/SaveResource.gd
index 5e7faa6..63cfd7f 100644
--- a/game/src/Game/Menu/SaveLoadMenu/SaveResource.gd
+++ b/game/src/Game/Menu/SaveLoadMenu/SaveResource.gd
@@ -27,7 +27,7 @@ var file_path : String:
 		emit_changed()
 var file : ConfigFile = ConfigFile.new()
 
-func set_file_path(name : StringName, path : String):
+func set_file_path(name : StringName, path : String) -> void:
 	file_path = path
 	save_name = name
 
diff --git a/game/src/Game/MusicConductor/MusicConductor.gd b/game/src/Game/MusicConductor/MusicConductor.gd
index f298db6..abfc52f 100644
--- a/game/src/Game/MusicConductor/MusicConductor.gd
+++ b/game/src/Game/MusicConductor/MusicConductor.gd
@@ -13,7 +13,7 @@ signal song_scrubbed(percentage : float, seconds : float)
 
 @export var _audio_stream_player : AudioStreamPlayer
 
-var _selected_track = 0
+var _selected_track := 0
 var _available_songs : Array[SongInfo] = []
 var _auto_play_next_song : bool = true
 
@@ -76,9 +76,9 @@ func select_previous_song() -> void:
 
 # REQUIREMENTS
 # * SND-2, SND-3
-func _ready():
-	var dir = DirAccess.open(music_directory)
-	for fname in dir.get_files():
+func _ready() -> void:
+	var dir := DirAccess.open(music_directory)
+	for fname : String in dir.get_files():
 		if fname.ends_with(".import"):
 			fname = fname.get_basename()
 			if fname.get_basename() == first_song_name:
@@ -91,7 +91,7 @@ func set_startup_music(play : bool) -> void:
 		_has_startup_happened = true
 		set_paused(not play)
 
-func _on_audio_stream_player_finished():
+func _on_audio_stream_player_finished() -> void:
 	song_finished.emit(_selected_track)
 	if _auto_play_next_song:
 		select_next_song()
diff --git a/game/src/Game/MusicConductor/MusicPlayer.gd b/game/src/Game/MusicConductor/MusicPlayer.gd
index e83ab9b..949f423 100644
--- a/game/src/Game/MusicConductor/MusicPlayer.gd
+++ b/game/src/Game/MusicConductor/MusicPlayer.gd
@@ -9,7 +9,7 @@ extends Control
 
 var _is_user_dragging_progress_slider : bool = false
 
-func _ready():
+func _ready() -> void:
 	for songName in MusicConductor.get_all_song_names():
 		_song_selector_button.add_item(songName, _song_selector_button.item_count)
 	_on_song_set(MusicConductor.get_current_song_index())
@@ -22,35 +22,35 @@ func _on_song_set(track_id : int) -> void:
 	_song_selector_button.selected = track_id
 	_update_play_pause_button()
 
-func _process(_delta):
+func _process(_delta : float) -> void:
 	if !_is_user_dragging_progress_slider:
 		_progress_slider.value = MusicConductor.get_current_song_progress_percentage()
 
-func _update_play_pause_button(_arg1 = null, _arg2 = null):
+func _update_play_pause_button(_arg1 : Variant = null, _arg2 : Variant = null) -> void:
 	_play_pause_button.text = "◼" if MusicConductor.is_paused() else "▶"
 
-func _on_play_pause_button_pressed():
+func _on_play_pause_button_pressed() -> void:
 	MusicConductor.toggle_play_pause()
 
 # REQUIREMENTS
 # * UIFUN-93
-func _on_next_song_button_pressed():
+func _on_next_song_button_pressed() -> void:
 	MusicConductor.select_next_song()
 
 # REQUIREMENTS
 # * UIFUN-94
-func _on_previous_song_button_pressed():
+func _on_previous_song_button_pressed() -> void:
 	MusicConductor.select_previous_song()
 
 # REQUIREMENTS
 # * UIFUN-95
-func _on_option_button_item_selected(index):
+func _on_option_button_item_selected(index : int) -> void:
 	MusicConductor.start_song_by_index(index)
 
-func _on_progress_slider_drag_started():
+func _on_progress_slider_drag_started() -> void:
 	_is_user_dragging_progress_slider = true
 
-func _on_progress_slider_drag_ended(_value_changed):
+func _on_progress_slider_drag_ended(_value_changed : bool) -> void:
 	MusicConductor.scrub_song_by_percentage(_progress_slider.value)
 	_is_user_dragging_progress_slider = false
 
@@ -65,5 +65,5 @@ func _set_music_player_visible(is_player_visible : bool) -> void:
 
 # REQUIREMENTS
 # * UIFUN-91
-func _on_music_ui_visibility_button_pressed():
+func _on_music_ui_visibility_button_pressed() -> void:
 	_set_music_player_visible(not MusicConductor.is_music_player_visible)
diff --git a/game/src/Game/MusicConductor/SongInfo.gd b/game/src/Game/MusicConductor/SongInfo.gd
index 1ee9adc..abcf120 100644
--- a/game/src/Game/MusicConductor/SongInfo.gd
+++ b/game/src/Game/MusicConductor/SongInfo.gd
@@ -5,7 +5,7 @@ var song_path : String = ""
 var song_name : String = ""
 var song_stream : Resource
 
-func _init(dirname:String, fname:String):
+func _init(dirname:String, fname:String) -> void:
 		song_path = dirname.path_join(fname)
 		song_name = fname.get_basename().replace("_", " ")
 		song_stream = load(song_path)
diff --git a/game/src/Game/SplashContainer.gd b/game/src/Game/SplashContainer.gd
index 524d314..e74620b 100644
--- a/game/src/Game/SplashContainer.gd
+++ b/game/src/Game/SplashContainer.gd
@@ -6,14 +6,14 @@ signal splash_end
 @export var _splash_image : TextureRect
 @export var _splash_video : VideoStreamPlayer
 
-func _process(_delta):
+func _process(_delta : float) -> void:
 	var stream_texture := _splash_video.get_video_texture()
 	if stream_texture != null and not stream_texture.get_image().is_invisible():
 		_splash_image.hide()
 		_splash_finish.show()
 		set_process(false)
 
-func _input(event):
+func _input(event : InputEvent) -> void:
 	if (event is InputEventKey\
 		or event is InputEventMouse\
 		or event is InputEventScreenTouch\
@@ -22,7 +22,7 @@ func _input(event):
 		_on_splash_startup_finished()
 		accept_event()
 
-func _on_splash_startup_finished():
+func _on_splash_startup_finished() -> void:
 	set_process_input(false)
 	splash_end.emit()
 	var tween := create_tween()