diff --git a/src/domain/login/CompleteSSOLoginViewModel.js b/src/domain/login/CompleteSSOLoginViewModel.ts
similarity index 72%
rename from src/domain/login/CompleteSSOLoginViewModel.js
rename to src/domain/login/CompleteSSOLoginViewModel.ts
index d41d53ec..b7be4642 100644
--- a/src/domain/login/CompleteSSOLoginViewModel.js
+++ b/src/domain/login/CompleteSSOLoginViewModel.ts
@@ -14,11 +14,24 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import {ViewModel} from "../ViewModel";
+import {Options as BaseOptions, ViewModel} from "../ViewModel";
 import {LoginFailure} from "../../matrix/Client.js";
+import type {TokenLoginMethod} from "../../matrix/login";
+import { Client } from "../../matrix/Client.js";
+
+type Options = {
+    client: Client;
+    attemptLogin: (loginMethod: TokenLoginMethod) => Promise<null>;
+    loginToken: string;
+} & BaseOptions
 
 export class CompleteSSOLoginViewModel extends ViewModel {
-    constructor(options) {
+    private _loginToken: string;
+    private _client: Client;
+    private _attemptLogin: (loginMethod: TokenLoginMethod) => Promise<null>;
+    private _errorMessage = "";
+
+    constructor(options: Options) {
         super(options);
         const {
             loginToken,
@@ -29,22 +42,22 @@ export class CompleteSSOLoginViewModel extends ViewModel {
         this._client = client;
         this._attemptLogin = attemptLogin;
         this._errorMessage = "";
-        this.performSSOLoginCompletion();
+        void this.performSSOLoginCompletion();
     }
 
-    get errorMessage() { return this._errorMessage; }
+    get errorMessage(): string { return this._errorMessage; }
 
-    _showError(message) {
+    _showError(message: string): void {
         this._errorMessage = message;
         this.emitChange("errorMessage");
     }
 
-    async performSSOLoginCompletion() {
+    async performSSOLoginCompletion(): Promise<void> {
         if (!this._loginToken) {
             return;
         }
         const homeserver = await this.platform.settingsStorage.getString("sso_ongoing_login_homeserver");
-        let loginOptions;
+        let loginOptions: { token?: (loginToken: string) => TokenLoginMethod; };
         try {
             loginOptions = await this._client.queryLogin(homeserver).result;
         }
diff --git a/src/domain/login/LoginViewModel.ts b/src/domain/login/LoginViewModel.ts
index 8eb11a9e..75d57880 100644
--- a/src/domain/login/LoginViewModel.ts
+++ b/src/domain/login/LoginViewModel.ts
@@ -16,9 +16,9 @@ limitations under the License.
 
 import {Client} from "../../matrix/Client.js";
 import {Options as BaseOptions, ViewModel} from "../ViewModel";
-import {PasswordLoginViewModel} from "./PasswordLoginViewModel.js";
-import {StartSSOLoginViewModel} from "./StartSSOLoginViewModel.js";
-import {CompleteSSOLoginViewModel} from "./CompleteSSOLoginViewModel.js";
+import {PasswordLoginViewModel} from "./PasswordLoginViewModel";
+import {StartSSOLoginViewModel} from "./StartSSOLoginViewModel";
+import {CompleteSSOLoginViewModel} from "./CompleteSSOLoginViewModel";
 import {LoadStatus} from "../../matrix/Client.js";
 import {SessionLoadViewModel} from "../SessionLoadViewModel.js";
 import {SegmentType} from "../navigation/index";
@@ -60,15 +60,15 @@ export class LoginViewModel extends ViewModel<SegmentType, Options> {
         this._initViewModels();
     }
 
-    get passwordLoginViewModel(): PasswordLoginViewModel {
+    get passwordLoginViewModel(): PasswordLoginViewModel | undefined {
         return this._passwordLoginViewModel;
     }
 
-    get startSSOLoginViewModel(): StartSSOLoginViewModel {
+    get startSSOLoginViewModel(): StartSSOLoginViewModel | undefined {
         return this._startSSOLoginViewModel;
     }
 
-    get completeSSOLoginViewModel(): CompleteSSOLoginViewModel {
+    get completeSSOLoginViewModel(): CompleteSSOLoginViewModel | undefined {
         return this._completeSSOLoginViewModel;
     }
 
@@ -285,7 +285,7 @@ export class LoginViewModel extends ViewModel<SegmentType, Options> {
 type ReadyFn = (client: Client) => void;
 
 // TODO: move to Client.js when its converted to typescript.
-type LoginOptions = {
+export type LoginOptions = {
     homeserver: string;
     password?: (username: string, password: string) => PasswordLoginMethod;
     sso?: SSOLoginHelper;
diff --git a/src/domain/login/PasswordLoginViewModel.js b/src/domain/login/PasswordLoginViewModel.ts
similarity index 66%
rename from src/domain/login/PasswordLoginViewModel.js
rename to src/domain/login/PasswordLoginViewModel.ts
index 7c4ff78a..6b4d9978 100644
--- a/src/domain/login/PasswordLoginViewModel.js
+++ b/src/domain/login/PasswordLoginViewModel.ts
@@ -14,43 +14,53 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import {ViewModel} from "../ViewModel";
 import {LoginFailure} from "../../matrix/Client.js";
+import type {PasswordLoginMethod} from "../../matrix/login";
+import {Options as BaseOptions, ViewModel} from "../ViewModel";
+import type {LoginOptions} from "./LoginViewModel";
+
+type Options = {
+    loginOptions: LoginOptions | undefined;
+    attemptLogin: (loginMethod: PasswordLoginMethod) => Promise<null>;
+} & BaseOptions
 
 export class PasswordLoginViewModel extends ViewModel {
-    constructor(options) {
+    private _loginOptions?: LoginOptions;
+    private _attemptLogin: (loginMethod: PasswordLoginMethod) => Promise<null>;
+    private _isBusy = false;
+    private _errorMessage = "";
+
+    constructor(options: Options) {
         super(options);
         const {loginOptions, attemptLogin} = options;
         this._loginOptions = loginOptions;
         this._attemptLogin = attemptLogin;
-        this._isBusy = false;
-        this._errorMessage = "";
     }
 
-    get isBusy() { return this._isBusy; }
-    get errorMessage() { return this._errorMessage; }
+    get isBusy(): boolean { return this._isBusy; }
+    get errorMessage(): string { return this._errorMessage; }
 
-    setBusy(status) {
+    setBusy(status: boolean): void {
         this._isBusy = status;
         this.emitChange("isBusy");
     }
 
-    _showError(message) {
+    _showError(message: string): void {
         this._errorMessage = message;
         this.emitChange("errorMessage");
     }
 
-    async login(username, password) {
+    async login(username: string, password: string): Promise<void>{
         this._errorMessage = "";
         this.emitChange("errorMessage");
-        const status = await this._attemptLogin(this._loginOptions.password(username, password));
+        const status = await this._attemptLogin(this._loginOptions!.password!(username, password));
         let error = "";
         switch (status) {
             case LoginFailure.Credentials:
                 error = this.i18n`Your username and/or password don't seem to be correct.`;
                 break;
             case LoginFailure.Connection:
-                error = this.i18n`Can't connect to ${this._loginOptions.homeserver}.`;
+                error = this.i18n`Can't connect to ${this._loginOptions!.homeserver}.`;
                 break;
             case LoginFailure.Unknown:
                 error = this.i18n`Something went wrong while checking your login and password.`;
diff --git a/src/domain/login/StartSSOLoginViewModel.js b/src/domain/login/StartSSOLoginViewModel.ts
similarity index 56%
rename from src/domain/login/StartSSOLoginViewModel.js
rename to src/domain/login/StartSSOLoginViewModel.ts
index dba0bcb5..b85bec71 100644
--- a/src/domain/login/StartSSOLoginViewModel.js
+++ b/src/domain/login/StartSSOLoginViewModel.ts
@@ -14,25 +14,35 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import {ViewModel} from "../ViewModel";
+import type {SSOLoginHelper} from "../../matrix/login";
+import {Options as BaseOptions, ViewModel} from "../ViewModel";
+import type {LoginOptions} from "./LoginViewModel";
+
+
+type Options = {
+    loginOptions: LoginOptions | undefined;
+} & BaseOptions;
 
 export class StartSSOLoginViewModel extends ViewModel{
-    constructor(options) {
+    private _sso?: SSOLoginHelper;
+    private _isBusy = false;
+
+    constructor(options: Options) {
         super(options);
-        this._sso = options.loginOptions.sso;
+        this._sso = options.loginOptions!.sso;
         this._isBusy = false;
     }
-   
-    get isBusy() { return this._isBusy; }
-    
-    setBusy(status) {
+
+    get isBusy(): boolean { return this._isBusy; }
+
+    setBusy(status: boolean): void {
         this._isBusy = status;
         this.emitChange("isBusy");
     }
 
-    async startSSOLogin() {
-        await this.platform.settingsStorage.setString("sso_ongoing_login_homeserver", this._sso.homeserver);
-        const link = this._sso.createSSORedirectURL(this.urlCreator.createSSOCallbackURL());
+    async startSSOLogin(): Promise<void> {
+        await this.platform.settingsStorage.setString("sso_ongoing_login_homeserver", this._sso!.homeserver);
+        const link = this._sso!.createSSORedirectURL(this.urlCreator.createSSOCallbackURL());
         this.platform.openUrl(link);
     }
 }