refactor(items): strengthen RoomChest types, guard receive_item, expose get_spawned_item

scripts/objects/room_chest.gd

@@ -9,7 +9,7 @@ const SPAWN_TWEEN_DURATION: float = 0.3
 
 @export var chest_id: String = ""
 
-var _spawned_items: Array = []
+var _spawned_items: Array[HoldableItem] = []
 var _item_configs: Array[ChestItemData] = []
 
 
@@ -41,6 +41,8 @@ func spawn_items() -> void:
 
 
 func receive_item(item: HoldableItem) -> void:
+	if not _spawned_items.has(item):
+		return
 	_spawned_items.erase(item)
 	if GameState.has_method("set_chest_state"):
 		if _spawned_items.is_empty():
@@ -63,6 +65,12 @@ func get_item_config_count() -> int:
 	return _item_configs.size()
 
 
+func get_spawned_item(index: int) -> HoldableItem:
+	if index < 0 or index >= _spawned_items.size():
+		return null
+	return _spawned_items[index]
+
+
 func _create_item(config: ChestItemData) -> HoldableItem:
 	var item: HoldableItem
 	if config.item_type == ChestItemData.ItemType.OUTFIT:
@@ -75,8 +83,8 @@ func _create_item(config: ChestItemData) -> HoldableItem:
 	return item
 
 
-func _get_spawned_ids() -> Array:
-	var ids: Array = []
+func _get_spawned_ids() -> Array[String]:
+	var ids: Array[String] = []
 	for item: HoldableItem in _spawned_items:
 		ids.append(item.item_id)
 	return ids

test/unit/test_room_chest.gd

@@ -80,6 +80,6 @@ func test_receive_item_decrements_spawned_count() -> void:
 	chest.chest_id = "reception_desk"
 	add_child_autofree(chest)
 	chest.spawn_items()
-	var item: HoldableItem = chest._spawned_items[0] as HoldableItem
+	var item: HoldableItem = chest.get_spawned_item(0)
 	chest.receive_item(item)
 	assert_eq(chest.get_spawned_count(), 2)