correct type issues

src/ViewModel/Chat/chatMessageViewModel.ts

@@ -11,9 +11,9 @@ import {
 export default class ChatMessageViewModel {
     // data
     chatMessage: ChatMessage;
-    channel: string;
-    sender: string;
-    dateSent: string;
+    channel: string = "";
+    sender: string = "";
+    dateSent: string = "";
     body: React.State<string> = new React.State("");
     inlineReply: ChatMessageViewModel | undefined = undefined;
     status: React.State<ChatMessageStatuses | any> = new React.State<any>(

src/ViewModel/Chat/chatViewModel.ts

@@ -143,14 +143,14 @@ export default class ChatViewModel extends ContextHost<ChatPageTypes> {
 
     // init
     constructor(
-        public readonly coreViewModel: CoreViewModel,
+        readonly coreViewModel: CoreViewModel,
         public readonly chatModel: ChatModel,
         public readonly settingsViewModel: SettingsViewModel,
         public readonly notificationViewModel: NotificationViewModel,
         public readonly connectionViewModel: ConnectionViewModel,
         public readonly chatListViewModel: ChatListViewModel,
     ) {
-        super("chat");
+        super("chat", coreViewModel);
 
         // page viewModels
         this.calendarViewModel = new CalendarPageViewModel(