diff --git a/dist/index.js b/dist/index.js
index e2438ebc..b456e8d3 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -2246,7 +2246,7 @@
   };
 
   // src/ViewModel/Global/coreViewModel.ts
-  var CoreViewModel = class _CoreViewModel {
+  var CoreViewModel = class {
     // init
     constructor(storageModel2, settingsModel2, connectionModel2, chatListModel2, fileTransferModel2) {
       this.storageModel = storageModel2;
@@ -2254,7 +2254,7 @@
       this.connectionModel = connectionModel2;
       this.chatListModel = chatListModel2;
       this.fileTransferModel = fileTransferModel2;
-      this.BUILD = "Build 26.04.12.C";
+      this.BUILD = "Build 26.04.13.A";
       // CONTEXT
       this.contextStack = /* @__PURE__ */ new Map();
       this.logContexts = () => {
@@ -2275,7 +2275,6 @@
         this.logContexts();
       };
       this.handleKeyDown = (e) => {
-        if (!_CoreViewModel.checkIsKeystroke(e)) return;
         const contexts = this.contexts;
         while (contexts.length > 0) {
           const currentContext = contexts.pop();
@@ -6067,6 +6066,7 @@
         this.presentedModal.value = 4 /* TransferDataInput */;
       };
       this.prepareReceivingData = () => {
+        if (this.cannotPrepareToReceive.value == true) return;
         this.presentedModal.value = 5 /* ReceptionDisplay */;
         this.filePathsReceived.clear();
         const transferData = {
@@ -6592,6 +6592,54 @@
 
   // src/Model/Global/settingsModel.ts
   var SettingsModel = class _SettingsModel {
+    // init
+    constructor(storageModel2) {
+      this.setName = (newValue) => {
+        this.username = newValue;
+        this.storeSetting("username", newValue);
+      };
+      this.setFirstDayOfWeek = (newValue) => {
+        this.firstDayOfWeek = newValue;
+        this.storeSetting("firstDayOfWeek", newValue);
+      };
+      this.setLanguage = (newValue) => {
+        this.language = newValue;
+        this.storeSetting("language", newValue);
+      };
+      this.setTheme = (newValue) => {
+        this.theme = newValue;
+        this.storeSetting("theme", newValue);
+      };
+      // load
+      this.readSetting = (pathName) => {
+        const path = StorageModel.getPath(
+          "settings" /* SettingsModel */,
+          filePaths.settingsModel[pathName]
+        );
+        return this.storageModel.read(path);
+      };
+      this.loadUsername = () => {
+        const content = this.readSetting("username");
+        this.username = content ?? "";
+      };
+      this.loadFirstDayofWeek = () => {
+        const content = this.readSetting("firstDayOfWeek");
+        this.firstDayOfWeek = content ?? "0";
+      };
+      this.loadLanguage = () => {
+        const content = this.readSetting("language");
+        this.language = content ?? _SettingsModel.getSystemLanguage();
+      };
+      this.loadTheme = () => {
+        const content = this.readSetting("theme");
+        this.theme = content ?? "system" /* System */;
+      };
+      this.storageModel = storageModel2;
+      this.loadUsername();
+      this.loadFirstDayofWeek();
+      this.loadLanguage();
+      this.loadTheme();
+    }
     // storage
     storeSetting(pathName, value) {
       const path = StorageModel.getPath(
@@ -6600,54 +6648,6 @@
       );
       this.storageModel.write(path, value);
     }
-    setName(newValue) {
-      this.username = newValue;
-      this.storeSetting("username", newValue);
-    }
-    setFirstDayOfWeek(newValue) {
-      this.firstDayOfWeek = newValue;
-      this.storeSetting("firstDayOfWeek", newValue);
-    }
-    setLanguage(newValue) {
-      this.language = newValue;
-      this.storeSetting("language", newValue);
-    }
-    setTheme(newValue) {
-      this.theme = newValue;
-      this.storeSetting("theme", newValue);
-    }
-    // load
-    readSetting(pathName) {
-      const path = StorageModel.getPath(
-        "settings" /* SettingsModel */,
-        filePaths.settingsModel[pathName]
-      );
-      return this.storageModel.read(path);
-    }
-    loadUsername() {
-      const content = this.readSetting("username");
-      this.username = content ?? "";
-    }
-    loadFirstDayofWeek() {
-      const content = this.readSetting("firstDayOfWeek");
-      this.firstDayOfWeek = content ?? "0";
-    }
-    loadLanguage() {
-      const content = this.readSetting("language");
-      this.language = content ?? _SettingsModel.getSystemLanguage();
-    }
-    loadTheme() {
-      const content = this.readSetting("theme");
-      this.theme = content ?? "system" /* System */;
-    }
-    // init
-    constructor(storageModel2) {
-      this.storageModel = storageModel2;
-      this.loadUsername();
-      this.loadFirstDayofWeek();
-      this.loadLanguage();
-      this.loadTheme();
-    }
     static getSystemLanguage() {
       switch (navigator.language.substring(0, 2)) {
         case "de":
diff --git a/src/Model/Chat/chatListModel.ts b/src/Model/Chat/chatListModel.ts
index 0d4c1787..98322993 100644
--- a/src/Model/Chat/chatListModel.ts
+++ b/src/Model/Chat/chatListModel.ts
@@ -10,12 +10,12 @@ import SettingsModel from "../Global/settingsModel";
 import { v4 } from "uuid";
 
 export default class ChatListModel {
-    storageModel: StorageModel;
-    settingsModel: SettingsModel;
-    connectionModel: ConnectionModel;
+    readonly storageModel: StorageModel;
+    readonly settingsModel: SettingsModel;
+    readonly connectionModel: ConnectionModel;
 
     // data
-    chatModels: Set<ChatModel> = new Set<ChatModel>();
+    chatModels = new Set<ChatModel>();
 
     // handlers
     messageHandler = (data: Message): void => {
diff --git a/src/Model/Chat/chatModel.ts b/src/Model/Chat/chatModel.ts
index c67fffba..653db858 100644
--- a/src/Model/Chat/chatModel.ts
+++ b/src/Model/Chat/chatModel.ts
@@ -26,21 +26,21 @@ import SettingsModel from "../Global/settingsModel";
 import { v4 } from "uuid";
 
 export default class ChatModel {
-    connectionModel: ConnectionModel;
-    storageModel: StorageModel;
-    settingsModel: SettingsModel;
-    chatListModel: ChatListModel;
+    readonly connectionModel: ConnectionModel;
+    readonly storageModel: StorageModel;
+    readonly settingsModel: SettingsModel;
+    readonly chatListModel: ChatListModel;
 
-    fileModel: FileModel;
+    readonly fileModel: FileModel;
 
     // data
-    id: string;
+    readonly id: string;
     info: ChatInfo;
     color: Colors;
 
     chatMessageHandlerManager: HandlerManager<ChatMessage> =
         new HandlerManager();
-    reactionHandlerManager: HandlerManager<ChatMessageReaction> =
+    readonly reactionHandlerManager: HandlerManager<ChatMessageReaction> =
         new HandlerManager();
 
     get secondaryChannels(): string[] {
@@ -459,12 +459,12 @@ export enum ChatMessageStatuses {
 }
 
 export interface ChatMessage extends ValidObject {
-    id: string;
+    readonly id: string;
 
-    channel: string;
-    sender: string;
+    readonly channel: string;
+    readonly sender: string;
     body: string;
-    dateSent: string;
+    readonly dateSent: string;
 
     status: ChatMessageStatuses;
 
@@ -473,9 +473,9 @@ export interface ChatMessage extends ValidObject {
 
 export interface ChatMessageReaction
     extends ValidObject, FileContent<"reaction"> {
-    messageId: string;
-    sender: string;
-    content: ReactionSymbols | string;
+    readonly messageId: string;
+    readonly sender: string;
+    readonly content: ReactionSymbols | string;
     isDeleting: boolean;
 }
 
diff --git a/src/Model/Files/boardsAndTasksModel.ts b/src/Model/Files/boardsAndTasksModel.ts
index 01c9d5f1..3ef1fd6d 100644
--- a/src/Model/Files/boardsAndTasksModel.ts
+++ b/src/Model/Files/boardsAndTasksModel.ts
@@ -15,16 +15,16 @@ import StorageModel from "../Global/storageModel";
 import { v4 } from "uuid";
 
 export default class BoardsAndTasksModel {
-    storageModel: StorageModel;
-    settingsModel: SettingsModel;
-    chatModel: ChatModel;
-    fileModel: FileModel;
+    readonly storageModel: StorageModel;
+    readonly settingsModel: SettingsModel;
+    readonly chatModel: ChatModel;
+    readonly fileModel: FileModel;
 
-    calendarModel: CalendarModel;
+    readonly calendarModel: CalendarModel;
 
     // data
-    boardHandlerManager = new HandlerManager<BoardInfoFileContent>();
-    taskHandlerManager = new HandlerManager<TaskFileContent>();
+    readonly boardHandlerManager = new HandlerManager<BoardInfoFileContent>();
+    readonly taskHandlerManager = new HandlerManager<TaskFileContent>();
 
     // paths
     getBasePath = (): string[] => {
diff --git a/src/Model/Files/calendarModel.ts b/src/Model/Files/calendarModel.ts
index 1432be16..32584f35 100644
--- a/src/Model/Files/calendarModel.ts
+++ b/src/Model/Files/calendarModel.ts
@@ -7,9 +7,9 @@ import StorageModel from "../Global/storageModel";
 import { TaskFileContent } from "./boardsAndTasksModel";
 
 export default class CalendarModel {
-    storageModel: StorageModel;
-    fileModel: FileModel;
-    settingsModel: SettingsModel;
+    readonly storageModel: StorageModel;
+    readonly fileModel: FileModel;
+    readonly settingsModel: SettingsModel;
 
     // paths
     getBasePath = (): string[] => {
@@ -155,12 +155,12 @@ export enum CalendarModelSubPaths {
 
 // types
 export interface MonthGrid<T> {
-    offset: number;
-    firstDayOfWeek: number;
-    isCurrentMonth: boolean;
+    readonly offset: number;
+    readonly firstDayOfWeek: number;
+    readonly isCurrentMonth: boolean;
 
-    year: number;
-    month: number;
+    readonly year: number;
+    readonly month: number;
 
-    days: { [date: string]: T };
+    readonly days: { [date: string]: T };
 }
diff --git a/src/Model/Files/fileModel.ts b/src/Model/Files/fileModel.ts
index 61c3a431..a6ea82e3 100644
--- a/src/Model/Files/fileModel.ts
+++ b/src/Model/Files/fileModel.ts
@@ -18,11 +18,11 @@ import SettingsModel from "../Global/settingsModel";
 import { v4 } from "uuid";
 
 export default class FileModel {
-    storageModel: StorageModel;
-    settingsModel: SettingsModel;
+    readonly storageModel: StorageModel;
+    readonly settingsModel: SettingsModel;
 
-    chatModel: ChatModel;
-    boardsAndTasksModel: BoardsAndTasksModel;
+    readonly chatModel: ChatModel;
+    readonly boardsAndTasksModel: BoardsAndTasksModel;
 
     // paths
     getBasePath = (): string[] => {
@@ -193,11 +193,11 @@ export enum FileModelSubPath {
 // types
 export interface FileContent<T extends string>
     extends ValidObject, StringEntryObject {
-    fileId: string;
-    fileContentId: string;
-    creationDate: string;
+    readonly fileId: string;
+    readonly fileContentId: string;
+    readonly creationDate: string;
 
-    type: T;
+    readonly type: T;
 }
 
 // references
diff --git a/src/Model/Global/connectionModel.ts b/src/Model/Global/connectionModel.ts
index b630b812..570564c5 100644
--- a/src/Model/Global/connectionModel.ts
+++ b/src/Model/Global/connectionModel.ts
@@ -6,8 +6,8 @@ import StorageModel, { StorageModelSubPaths, filePaths } from "./storageModel";
 import UDNFrontend, { Message } from "udn-frontend";
 
 export default class ConnectionModel {
-    udn: UDNFrontend;
-    storageModel: StorageModel;
+    readonly udn: UDNFrontend;
+    readonly storageModel: StorageModel;
     reconnectInterval: number | undefined = undefined;
     shouldAttemptReconnect: boolean = false;
 
@@ -20,10 +20,10 @@ export default class ConnectionModel {
         return this.udn.ws?.url;
     }
 
-    connectionChangeHandlerManager = new HandlerManager<void>();
-    messageHandlerManager = new HandlerManager<Message>();
-    messageSentHandlerManager = new HandlerManager<ChatMessage>();
-    channelsToSubscribe = new Set<string>();
+    readonly connectionChangeHandlerManager = new HandlerManager<void>();
+    readonly messageHandlerManager = new HandlerManager<Message>();
+    readonly messageSentHandlerManager = new HandlerManager<ChatMessage>();
+    readonly channelsToSubscribe = new Set<string>();
 
     // handlers
     handleMessage = (data: Message): void => {
diff --git a/src/Model/Global/fileTransferModel.ts b/src/Model/Global/fileTransferModel.ts
index ab57c02f..e3cdc62f 100644
--- a/src/Model/Global/fileTransferModel.ts
+++ b/src/Model/Global/fileTransferModel.ts
@@ -14,15 +14,15 @@ import StorageModel from "./storageModel";
 import { checkMatchesObjectStructure } from "../Utility/typeSafety";
 
 export default class FileTransferModel {
-    storageModel: StorageModel;
-    connectionModel: ConnectionModel;
+    readonly storageModel: StorageModel;
+    readonly connectionModel: ConnectionModel;
 
     static READY_MESSAGE = "ready";
 
     // data
-    transferData: TransferData | undefined = undefined;
-    fileHandlerManager = new HandlerManager<string>();
-    readyToSendHandlerManager = new HandlerManager<boolean>();
+    transferData: TransferData | undefined;
+    readonly fileHandlerManager = new HandlerManager<string>();
+    readonly readyToSendHandlerManager = new HandlerManager<boolean>();
     direction: TransferDirections = TransferDirections.Send;
 
     // general
@@ -140,8 +140,8 @@ export default class FileTransferModel {
 }
 
 export interface TransferData {
-    channel: string;
-    key: string;
+    readonly channel: string;
+    readonly key: string;
 }
 
 export interface FileData {
diff --git a/src/Model/Global/settingsModel.ts b/src/Model/Global/settingsModel.ts
index 73998607..828e1770 100644
--- a/src/Model/Global/settingsModel.ts
+++ b/src/Model/Global/settingsModel.ts
@@ -3,7 +3,7 @@
 import StorageModel, { StorageModelSubPaths, filePaths } from "./storageModel";
 
 export default class SettingsModel {
-    storageModel: StorageModel;
+    readonly storageModel: StorageModel;
 
     // data
     username: string;
diff --git a/src/ViewModel/Chat/chatListViewModel.ts b/src/ViewModel/Chat/chatListViewModel.ts
index 56e23812..8f350cce 100644
--- a/src/ViewModel/Chat/chatListViewModel.ts
+++ b/src/ViewModel/Chat/chatListViewModel.ts
@@ -14,7 +14,7 @@ export default class ChatListViewModel {
     notificationViewModel: NotificationViewModel;
 
     // data
-    chatIndexManager = new IndexManager<ChatViewModel>(
+    readonly chatIndexManager = new IndexManager<ChatViewModel>(
         (chatViewModel: ChatViewModel) =>
             chatViewModel.settingsPageViewModel.primaryChannel.value,
     );
@@ -96,9 +96,9 @@ export default class ChatListViewModel {
 
     // init
     constructor(
-        public coreViewModel: CoreViewModel,
-        public settingsViewModel: SettingsViewModel,
-        public connectionViewModel: ConnectionViewModel,
+        public readonly coreViewModel: CoreViewModel,
+        public readonly settingsViewModel: SettingsViewModel,
+        public readonly connectionViewModel: ConnectionViewModel,
     ) {
         this.notificationViewModel = new NotificationViewModel(this);
 
diff --git a/src/ViewModel/Chat/chatMessageViewModel.ts b/src/ViewModel/Chat/chatMessageViewModel.ts
index 71bb7842..6a7f8092 100644
--- a/src/ViewModel/Chat/chatMessageViewModel.ts
+++ b/src/ViewModel/Chat/chatMessageViewModel.ts
@@ -123,8 +123,8 @@ export default class ChatMessageViewModel {
 
     // init
     constructor(
-        public coreViewModel: CoreViewModel,
-        public messagePageViewModel: MessagePageViewModel,
+        public readonly coreViewModel: CoreViewModel,
+        public readonly messagePageViewModel: MessagePageViewModel,
         chatMessage: ChatMessage,
         sentByUser: boolean,
     ) {
diff --git a/src/ViewModel/Chat/chatViewModel.ts b/src/ViewModel/Chat/chatViewModel.ts
index 7c88482d..b9fccba4 100644
--- a/src/ViewModel/Chat/chatViewModel.ts
+++ b/src/ViewModel/Chat/chatViewModel.ts
@@ -145,12 +145,12 @@ export default class ChatViewModel extends ContextHost<ChatPageTypes> {
 
     // init
     constructor(
-        public coreViewModel: CoreViewModel,
-        public chatModel: ChatModel,
-        public settingsViewModel: SettingsViewModel,
-        public notificationViewModel: NotificationViewModel,
-        public connectionViewModel: ConnectionViewModel,
-        public chatListViewModel: ChatListViewModel,
+        public readonly coreViewModel: CoreViewModel,
+        public readonly chatModel: ChatModel,
+        public readonly settingsViewModel: SettingsViewModel,
+        public readonly notificationViewModel: NotificationViewModel,
+        public readonly connectionViewModel: ConnectionViewModel,
+        public readonly chatListViewModel: ChatListViewModel,
     ) {
         super();
 
diff --git a/src/ViewModel/Global/connectionViewModel.ts b/src/ViewModel/Global/connectionViewModel.ts
index d8a712e3..6a8da2dd 100644
--- a/src/ViewModel/Global/connectionViewModel.ts
+++ b/src/ViewModel/Global/connectionViewModel.ts
@@ -87,7 +87,7 @@ export default class ConnectionViewModel {
     };
 
     // init
-    constructor(public coreViewModel: CoreViewModel) {
+    constructor(public readonly coreViewModel: CoreViewModel) {
         this.updatePreviousAddresses();
 
         coreViewModel.connectionModel.connectionChangeHandlerManager.addHandler(
diff --git a/src/ViewModel/Global/coreViewModel.ts b/src/ViewModel/Global/coreViewModel.ts
index 1e7ddf58..8b6a70fd 100644
--- a/src/ViewModel/Global/coreViewModel.ts
+++ b/src/ViewModel/Global/coreViewModel.ts
@@ -66,11 +66,11 @@ export default class CoreViewModel {
 
     // init
     constructor(
-        public storageModel: StorageModel,
-        public settingsModel: SettingsModel,
-        public connectionModel: ConnectionModel,
-        public chatListModel: ChatListModel,
-        public fileTransferModel: FileTransferModel,
+        public readonly storageModel: StorageModel,
+        public readonly settingsModel: SettingsModel,
+        public readonly connectionModel: ConnectionModel,
+        public readonly chatListModel: ChatListModel,
+        public readonly fileTransferModel: FileTransferModel,
     ) {
         this.translations =
             allTranslations[settingsModel.language] || allTranslations.en;
diff --git a/src/ViewModel/Global/fileTransferViewModel.ts b/src/ViewModel/Global/fileTransferViewModel.ts
index dd620fbc..7ec53498 100644
--- a/src/ViewModel/Global/fileTransferViewModel.ts
+++ b/src/ViewModel/Global/fileTransferViewModel.ts
@@ -13,7 +13,7 @@ import CoreViewModel, { Context } from "./coreViewModel";
 import { CommonKeys } from "../../View/keystrokes";
 
 export default class FileTransferViewModel extends Context {
-    contextDebugDescription: string = "transfer";
+    contextDebugDescription = "transfer";
 
     // state
     presentedModal: React.State<FileTransferModals | undefined> =
@@ -172,7 +172,7 @@ export default class FileTransferViewModel extends Context {
     };
 
     // init
-    constructor(public coreViewModel: CoreViewModel) {
+    constructor(public readonly coreViewModel: CoreViewModel) {
         super();
 
         this.coreViewModel.fileTransferModel.fileHandlerManager.addHandler(
diff --git a/src/ViewModel/Global/notificationViewModel.ts b/src/ViewModel/Global/notificationViewModel.ts
index fe186893..b1872a71 100644
--- a/src/ViewModel/Global/notificationViewModel.ts
+++ b/src/ViewModel/Global/notificationViewModel.ts
@@ -76,7 +76,7 @@ export default class NotificationViewModel {
     };
 
     // init
-    constructor(public chatListViewModel: ChatListViewModel) {}
+    constructor(public readonly chatListViewModel: ChatListViewModel) {}
 
     // util
     static createNotification(message: ChatMessage): Notification {
diff --git a/src/ViewModel/Global/settingsViewModel.ts b/src/ViewModel/Global/settingsViewModel.ts
index 301c2dbd..aba94752 100644
--- a/src/ViewModel/Global/settingsViewModel.ts
+++ b/src/ViewModel/Global/settingsViewModel.ts
@@ -5,7 +5,7 @@ import { Languages, ThemeSettings } from "../../Model/Global/settingsModel";
 import { CommonKeys } from "../../View/keystrokes";
 
 export default class SettingsViewModel extends Context {
-    contextDebugDescription: string = "settings";
+    contextDebugDescription = "settings";
 
     // state
     username: React.State<string> = new React.State("");
@@ -72,7 +72,7 @@ export default class SettingsViewModel extends Context {
     };
 
     // init
-    constructor(public coreViewModel: CoreViewModel) {
+    constructor(public readonly coreViewModel: CoreViewModel) {
         super();
 
         this.username.value = coreViewModel.settingsModel.username;
diff --git a/src/ViewModel/Global/storageViewModel.ts b/src/ViewModel/Global/storageViewModel.ts
index 2723c2b3..2cc27d09 100644
--- a/src/ViewModel/Global/storageViewModel.ts
+++ b/src/ViewModel/Global/storageViewModel.ts
@@ -65,7 +65,7 @@ export default class StorageViewModel extends Context {
     };
 
     // init
-    constructor(public coreViewModel: CoreViewModel) {
+    constructor(public readonly coreViewModel: CoreViewModel) {
         super();
 
         this.selectedFileName = React.createProxyState(
diff --git a/src/ViewModel/Pages/boardViewModel.ts b/src/ViewModel/Pages/boardViewModel.ts
index f2fbf36b..8af8914a 100644
--- a/src/ViewModel/Pages/boardViewModel.ts
+++ b/src/ViewModel/Pages/boardViewModel.ts
@@ -16,7 +16,7 @@ import TaskViewModel from "./taskViewModel";
 import { CommonKeys } from "../../View/keystrokes";
 
 export default class BoardViewModel extends TaskContainingPageViewModel {
-    contextDebugDescription: string = "board";
+    contextDebugDescription = "board";
 
     // state
     name: React.State<string> = new React.State("");
@@ -247,11 +247,11 @@ export default class BoardViewModel extends TaskContainingPageViewModel {
 
     // init
     constructor(
-        public coreViewModel: CoreViewModel,
-        public chatViewModel: ChatViewModel,
-        public boardsAndTasksModel: BoardsAndTasksModel,
-        public taskPageViewModel: TaskPageViewModel,
-        public boardInfo: BoardInfoFileContent,
+        public readonly coreViewModel: CoreViewModel,
+        public readonly chatViewModel: ChatViewModel,
+        public readonly boardsAndTasksModel: BoardsAndTasksModel,
+        public readonly taskPageViewModel: TaskPageViewModel,
+        public readonly boardInfo: BoardInfoFileContent,
     ) {
         super(coreViewModel, chatViewModel, boardsAndTasksModel);
 
diff --git a/src/ViewModel/Pages/calendarPageViewModel.ts b/src/ViewModel/Pages/calendarPageViewModel.ts
index 257f4dc0..c63425e5 100644
--- a/src/ViewModel/Pages/calendarPageViewModel.ts
+++ b/src/ViewModel/Pages/calendarPageViewModel.ts
@@ -185,10 +185,10 @@ export default class CalendarPageViewModel extends TaskContainingPageViewModel {
 
     // init
     constructor(
-        public coreViewModel: CoreViewModel,
-        public chatViewModel: ChatViewModel,
-        public calendarModel: CalendarModel,
-        public boardsAndTasksModel: BoardsAndTasksModel,
+        public readonly coreViewModel: CoreViewModel,
+        public readonly chatViewModel: ChatViewModel,
+        public readonly calendarModel: CalendarModel,
+        public readonly boardsAndTasksModel: BoardsAndTasksModel,
     ) {
         super(coreViewModel, chatViewModel, boardsAndTasksModel);
 
diff --git a/src/ViewModel/Pages/homeViewModel.ts b/src/ViewModel/Pages/homeViewModel.ts
index f8c34455..b5a5a741 100644
--- a/src/ViewModel/Pages/homeViewModel.ts
+++ b/src/ViewModel/Pages/homeViewModel.ts
@@ -9,11 +9,11 @@ export default class HomeViewModel extends Context {
     contextDebugDescription = "home";
 
     constructor(
-        public coreViewModel: CoreViewModel,
-        public settingsViewModel: SettingsViewModel,
-        public fileTransferViewModel: FileTransferViewModel,
-        public storageViewModel: StorageViewModel,
-        public connectionViewModel: ConnectionViewModel,
+        public readonly coreViewModel: CoreViewModel,
+        public readonly settingsViewModel: SettingsViewModel,
+        public readonly fileTransferViewModel: FileTransferViewModel,
+        public readonly storageViewModel: StorageViewModel,
+        public readonly connectionViewModel: ConnectionViewModel,
     ) {
         super();
 
diff --git a/src/ViewModel/Pages/messagePageViewModel.ts b/src/ViewModel/Pages/messagePageViewModel.ts
index 085394f2..a8e9bf69 100644
--- a/src/ViewModel/Pages/messagePageViewModel.ts
+++ b/src/ViewModel/Pages/messagePageViewModel.ts
@@ -127,8 +127,8 @@ export default class MessagePageViewModel extends Context {
 
     // init
     constructor(
-        public coreViewModel: CoreViewModel,
-        public chatViewModel: ChatViewModel,
+        public readonly coreViewModel: CoreViewModel,
+        public readonly chatViewModel: ChatViewModel,
     ) {
         super();
 
diff --git a/src/ViewModel/Pages/settingsPageViewModel.ts b/src/ViewModel/Pages/settingsPageViewModel.ts
index d6c771a0..ac19b879 100644
--- a/src/ViewModel/Pages/settingsPageViewModel.ts
+++ b/src/ViewModel/Pages/settingsPageViewModel.ts
@@ -112,8 +112,8 @@ export default class SettingsPageViewModel extends Context {
 
     // init
     constructor(
-        public coreViewModel: CoreViewModel,
-        public chatViewModel: ChatViewModel,
+        public readonly coreViewModel: CoreViewModel,
+        public readonly chatViewModel: ChatViewModel,
     ) {
         super();
 
diff --git a/src/ViewModel/Pages/taskContainingPageViewModel.ts b/src/ViewModel/Pages/taskContainingPageViewModel.ts
index 226a5d16..86e9c0a8 100644
--- a/src/ViewModel/Pages/taskContainingPageViewModel.ts
+++ b/src/ViewModel/Pages/taskContainingPageViewModel.ts
@@ -11,7 +11,7 @@ import TaskViewModel from "./taskViewModel";
 
 export default class TaskContainingPageViewModel extends Context {
     // state
-    taskIndexManager = new IndexManager<TaskViewModel>(
+    readonly taskIndexManager = new IndexManager<TaskViewModel>(
         (taskViewModel: TaskViewModel) => taskViewModel.sortingString,
     );
 
@@ -56,9 +56,9 @@ export default class TaskContainingPageViewModel extends Context {
 
     // init
     constructor(
-        public coreViewModel: CoreViewModel,
-        public chatViewModel: ChatViewModel,
-        public boardsAndTasksModel: BoardsAndTasksModel,
+        public readonly coreViewModel: CoreViewModel,
+        public readonly chatViewModel: ChatViewModel,
+        public readonly boardsAndTasksModel: BoardsAndTasksModel,
     ) {
         super();
     }
diff --git a/src/ViewModel/Pages/taskPageViewModel.ts b/src/ViewModel/Pages/taskPageViewModel.ts
index 889348d3..6696bb1a 100644
--- a/src/ViewModel/Pages/taskPageViewModel.ts
+++ b/src/ViewModel/Pages/taskPageViewModel.ts
@@ -11,10 +11,10 @@ import { IndexManager } from "../../Model/Utility/utility";
 import { CommonKeys } from "../../View/keystrokes";
 
 export default class TaskPageViewModel extends ContextHost<string> {
-    contextDebugDescription: string = "task-page";
+    contextDebugDescription = "task-page";
 
     // data
-    boardIndexManager = new IndexManager<BoardViewModel>(
+    readonly boardIndexManager = new IndexManager<BoardViewModel>(
         (boardViewModel: BoardViewModel) => boardViewModel.name.value,
     );
 
@@ -162,9 +162,9 @@ export default class TaskPageViewModel extends ContextHost<string> {
 
     // init
     constructor(
-        public coreViewModel: CoreViewModel,
-        public chatViewModel: ChatViewModel,
-        public boardsAndTasksModel: BoardsAndTasksModel,
+        public readonly coreViewModel: CoreViewModel,
+        public readonly chatViewModel: ChatViewModel,
+        public readonly boardsAndTasksModel: BoardsAndTasksModel,
     ) {
         super();
 
diff --git a/src/ViewModel/Pages/taskViewModel.ts b/src/ViewModel/Pages/taskViewModel.ts
index 6f13dfdd..3367d5f5 100644
--- a/src/ViewModel/Pages/taskViewModel.ts
+++ b/src/ViewModel/Pages/taskViewModel.ts
@@ -210,10 +210,10 @@ export default class TaskViewModel extends Context {
 
     // init
     constructor(
-        public coreViewModel: CoreViewModel,
-        public chatViewModel: ChatViewModel,
-        public boardsAndTasksModel: BoardsAndTasksModel,
-        public containingModel: TaskContainingPageViewModel,
+        public readonly coreViewModel: CoreViewModel,
+        public readonly chatViewModel: ChatViewModel,
+        public readonly boardsAndTasksModel: BoardsAndTasksModel,
+        public readonly containingModel: TaskContainingPageViewModel,
         public task: TaskFileContent,
     ) {
         super();
diff --git a/src/ViewModel/Utility/taskPropertyBulkChangeViewModel.ts b/src/ViewModel/Utility/taskPropertyBulkChangeViewModel.ts
index 07d1882f..3729159c 100644
--- a/src/ViewModel/Utility/taskPropertyBulkChangeViewModel.ts
+++ b/src/ViewModel/Utility/taskPropertyBulkChangeViewModel.ts
@@ -19,7 +19,7 @@ export default class TaskPropertyBulkChangeViewModel {
         });
     };
 
-    setValue: (newValue: string, taskViewModel: TaskViewModel) => void = () => {};
+    setValue: (newValue: string, taskViewModel: TaskViewModel) => void;
 
     // init
     constructor(