diff --git a/packages/app/App.tsx b/packages/app/App.tsx
deleted file mode 100644
index 0c98ed0..0000000
--- a/packages/app/App.tsx
+++ /dev/null
@@ -1,34 +0,0 @@
-import React from 'react';
-import { hot } from 'react-hot-loader/root';
-import { Provider as ReduxProvider } from 'react-redux';
-import { Router, Route, Switch } from 'react-router-dom';
-import { IntlProvider } from 'app/components/i18n';
-import { Store } from 'redux';
-import AuthFlowRoute from 'app/containers/AuthFlowRoute';
-import RootPage from 'app/pages/root/RootPage';
-import SuccessOauthPage from 'app/pages/auth/SuccessOauthPage';
-
-const App = ({
-  store,
-  browserHistory,
-}: {
-  store: Store;
-  browserHistory: any;
-}) => (
-  <ReduxProvider store={store}>
-    <IntlProvider>
-      <Router history={browserHistory}>
-        <Switch>
-          <Route path="/oauth2/code/success" component={SuccessOauthPage} />
-          <AuthFlowRoute
-            path="/oauth2/:version(v\d+)/:clientId?"
-            component={() => null}
-          />
-          <Route path="/" component={RootPage} />
-        </Switch>
-      </Router>
-    </IntlProvider>
-  </ReduxProvider>
-);
-
-export default hot(App);
diff --git a/packages/app/components/auth/reducer.ts b/packages/app/components/auth/reducer.ts
index 9bc7ab1..b9a5313 100644
--- a/packages/app/components/auth/reducer.ts
+++ b/packages/app/components/auth/reducer.ts
@@ -1,4 +1,5 @@
 import { combineReducers } from 'redux';
+import { RootState } from 'app/reducers';
 
 import {
   ERROR,
@@ -27,9 +28,25 @@ export interface Client {
   description: string;
 }
 
+interface OAuthState {
+  clientId: string;
+  redirectUrl: string;
+  responseType: string;
+  description?: string;
+  scope: string;
+  prompt: string;
+  loginHint: string;
+  state: string;
+  success?: boolean;
+  code?: string;
+  displayCode?: string;
+  acceptRequired?: boolean;
+}
+
 export interface State {
   credentials: Credentials;
   error:
+    | null
     | string
     | {
         type: string;
@@ -38,25 +55,11 @@ export interface State {
   isLoading: boolean;
   isSwitcherEnabled: boolean;
   client: Client | null;
-  login: string;
-  oauth: {
-    clientId: string;
-    redirectUrl: string;
-    responseType: string;
-    description: string;
-    scope: string;
-    prompt: string;
-    loginHint: string;
-    state: string;
-    success?: boolean;
-    code?: string;
-    displayCode?: string;
-    acceptRequired?: boolean;
-  } | null;
+  oauth: OAuthState | null;
   scopes: string[];
 }
 
-export default combineReducers({
+export default combineReducers<State>({
   credentials,
   error,
   isLoading,
@@ -66,7 +69,10 @@ export default combineReducers({
   scopes,
 });
 
-function error(state = null, { type, payload = null, error = false }) {
+function error(
+  state = null,
+  { type, payload = null, error = false },
+): State['error'] {
   switch (type) {
     case ERROR:
       if (!error) {
@@ -89,7 +95,7 @@ function credentials(
     type: string;
     payload: Credentials | null;
   },
-) {
+): State['credentials'] {
   if (type === SET_CREDENTIALS) {
     if (payload && typeof payload === 'object') {
       return {
@@ -103,7 +109,10 @@ function credentials(
   return state;
 }
 
-function isSwitcherEnabled(state = true, { type, payload = false }) {
+function isSwitcherEnabled(
+  state = true,
+  { type, payload = false },
+): State['isSwitcherEnabled'] {
   switch (type) {
     case SET_SWITCHER:
       if (typeof payload !== 'boolean') {
@@ -117,7 +126,10 @@ function isSwitcherEnabled(state = true, { type, payload = false }) {
   }
 }
 
-function isLoading(state = false, { type, payload = null }) {
+function isLoading(
+  state = false,
+  { type, payload = null },
+): State['isLoading'] {
   switch (type) {
     case SET_LOADING_STATE:
       return !!payload;
@@ -127,7 +139,7 @@ function isLoading(state = false, { type, payload = null }) {
   }
 }
 
-function client(state = null, { type, payload }) {
+function client(state = null, { type, payload }): State['client'] {
   switch (type) {
     case SET_CLIENT:
       return {
@@ -141,7 +153,10 @@ function client(state = null, { type, payload }) {
   }
 }
 
-function oauth(state: State | null = null, { type, payload }) {
+function oauth(
+  state: State['oauth'] = null,
+  { type, payload },
+): State['oauth'] {
   switch (type) {
     case SET_OAUTH:
       return {
@@ -156,7 +171,7 @@ function oauth(state: State | null = null, { type, payload }) {
 
     case SET_OAUTH_RESULT:
       return {
-        ...state,
+        ...(state as OAuthState),
         success: payload.success,
         code: payload.code,
         displayCode: payload.displayCode,
@@ -164,7 +179,7 @@ function oauth(state: State | null = null, { type, payload }) {
 
     case REQUIRE_PERMISSIONS_ACCEPT:
       return {
-        ...state,
+        ...(state as OAuthState),
         acceptRequired: true,
       };
 
@@ -173,7 +188,7 @@ function oauth(state: State | null = null, { type, payload }) {
   }
 }
 
-function scopes(state = [], { type, payload = [] }) {
+function scopes(state = [], { type, payload = [] }): State['scopes'] {
   switch (type) {
     case SET_SCOPES:
       return payload;
@@ -183,10 +198,10 @@ function scopes(state = [], { type, payload = [] }) {
   }
 }
 
-export function getLogin(state: { [key: string]: any }): string | null {
+export function getLogin(state: RootState): string | null {
   return state.auth.credentials.login || null;
 }
 
-export function getCredentials(state: { [key: string]: any }): Credentials {
+export function getCredentials(state: RootState): Credentials {
   return state.auth.credentials;
 }
diff --git a/packages/app/components/ui/bsod/reducer.js b/packages/app/components/ui/bsod/reducer.ts
similarity index 50%
rename from packages/app/components/ui/bsod/reducer.js
rename to packages/app/components/ui/bsod/reducer.ts
index 048a893..df930db 100644
--- a/packages/app/components/ui/bsod/reducer.js
+++ b/packages/app/components/ui/bsod/reducer.ts
@@ -1,6 +1,8 @@
 import { BSOD } from './actions';
 
-export default function(state = false, { type }) {
+export type State = boolean;
+
+export default function(state: State = false, { type }): State {
   if (type === BSOD) {
     return true;
   }
diff --git a/packages/app/index.tsx b/packages/app/index.tsx
index 716fc8b..7165d76 100644
--- a/packages/app/index.tsx
+++ b/packages/app/index.tsx
@@ -14,7 +14,7 @@ import history, { browserHistory } from 'app/services/history';
 import i18n from 'app/services/i18n';
 import { loadScript, debounce } from 'app/functions';
 
-import App from './App';
+import App from './shell';
 
 const win: { [key: string]: any } = window as any;
 
@@ -35,7 +35,7 @@ Promise.all([
   i18n.ensureIntl(), // ensure, that intl is polyfilled before any rendering
 ]).then(() => {
   ReactDOM.render(
-    <App store={store} browserHistory={browserHistory} />,
+    <App store={store} history={browserHistory} />,
     document.getElementById('app'),
   );
 
diff --git a/packages/app/reducers.ts b/packages/app/reducers.ts
index f204bc8..bf337ae 100644
--- a/packages/app/reducers.ts
+++ b/packages/app/reducers.ts
@@ -7,13 +7,14 @@ import accounts, {
 } from 'app/components/accounts/reducer';
 import i18n, { State as I18nState } from 'app/components/i18n/reducer';
 import popup, { State as PopupState } from 'app/components/ui/popup/reducer';
-import bsod from 'app/components/ui/bsod/reducer';
+import bsod, { State as BsodState } from 'app/components/ui/bsod/reducer';
 import apps, { Apps } from 'app/components/dev/apps/reducer';
 import { ThunkDispatch, ThunkAction as ReduxThunkAction } from 'redux-thunk';
 import { Store as ReduxStore } from 'redux';
 
 export interface RootState {
   auth: AuthState;
+  bsod: BsodState;
   accounts: AccountsState;
   user: User;
   popup: PopupState;
@@ -41,7 +42,7 @@ export type Store = ReduxStore<RootState> & {
   dispatch: Dispatch;
 };
 
-export default combineReducers({
+export default combineReducers<RootState>({
   bsod,
   auth,
   user,
diff --git a/packages/app/services/api/oauth.ts b/packages/app/services/api/oauth.ts
index 30c9096..5bb99fc 100644
--- a/packages/app/services/api/oauth.ts
+++ b/packages/app/services/api/oauth.ts
@@ -33,7 +33,7 @@ type OauthRequestData = {
   client_id: string;
   redirect_uri: string;
   response_type: string;
-  description: string;
+  description?: string;
   scope: string;
   prompt: string;
   login_hint?: string;
@@ -44,7 +44,7 @@ export type OauthData = {
   clientId: string;
   redirectUrl: string;
   responseType: string;
-  description: string;
+  description?: string;
   scope: string;
   prompt: string; // comma separated list of 'none' | 'consent' | 'select_account';
   loginHint?: string;
diff --git a/packages/app/shell/App.tsx b/packages/app/shell/App.tsx
new file mode 100644
index 0000000..28a54af
--- /dev/null
+++ b/packages/app/shell/App.tsx
@@ -0,0 +1,24 @@
+import React from 'react';
+import { hot } from 'react-hot-loader/root';
+import { Route, Switch } from 'react-router-dom';
+import { Store } from 'app/reducers';
+import AuthFlowRoute from 'app/containers/AuthFlowRoute';
+import RootPage from 'app/pages/root/RootPage';
+import SuccessOauthPage from 'app/pages/auth/SuccessOauthPage';
+
+import ContextProvider from './ContextProvider';
+
+const App = ({ store, history }: { store: Store; history: any }) => (
+  <ContextProvider store={store} history={history}>
+    <Switch>
+      <Route path="/oauth2/code/success" component={SuccessOauthPage} />
+      <AuthFlowRoute
+        path="/oauth2/:version(v\d+)/:clientId?"
+        component={() => null}
+      />
+      <Route path="/" component={RootPage} />
+    </Switch>
+  </ContextProvider>
+);
+
+export default hot(App);
diff --git a/packages/app/shell/ContextProvider.tsx b/packages/app/shell/ContextProvider.tsx
new file mode 100644
index 0000000..a4c62de
--- /dev/null
+++ b/packages/app/shell/ContextProvider.tsx
@@ -0,0 +1,25 @@
+import React from 'react';
+import { Provider as ReduxProvider } from 'react-redux';
+import { Router } from 'react-router-dom';
+import { IntlProvider } from 'app/components/i18n';
+import { Store } from 'app/reducers';
+
+function ContextProvider({
+  children,
+  store,
+  history,
+}: {
+  children: React.ReactNode;
+  store: Store;
+  history: any;
+}) {
+  return (
+    <ReduxProvider store={store}>
+      <IntlProvider>
+        <Router history={history}>{children}</Router>
+      </IntlProvider>
+    </ReduxProvider>
+  );
+}
+
+export default ContextProvider;
diff --git a/packages/app/shell/index.ts b/packages/app/shell/index.ts
new file mode 100644
index 0000000..8df1f26
--- /dev/null
+++ b/packages/app/shell/index.ts
@@ -0,0 +1,2 @@
+export { default } from './App';
+export { default as ContextProvider } from './ContextProvider';
diff --git a/packages/app/storeFactory.js b/packages/app/storeFactory.ts
similarity index 84%
rename from packages/app/storeFactory.js
rename to packages/app/storeFactory.ts
index 8d5b236..540594b 100644
--- a/packages/app/storeFactory.js
+++ b/packages/app/storeFactory.ts
@@ -6,26 +6,25 @@ import { createStore, applyMiddleware, compose } from 'redux';
 import thunk from 'redux-thunk';
 import persistState from 'redux-localstorage';
 
-import reducers from 'app/reducers';
+import reducers, { Store } from 'app/reducers';
 
-export default function storeFactory() {
+export default function storeFactory(): Store {
   const middlewares = applyMiddleware(thunk);
   const persistStateEnhancer = persistState(['accounts', 'user'], {
     key: 'redux-storage',
   });
 
-  /* global process: false */
   let enhancer;
 
   if (process.env.NODE_ENV === 'production') {
     enhancer = compose(middlewares, persistStateEnhancer);
   } else {
     const composeEnhancers =
-      window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;
+      (window as any).__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;
     enhancer = composeEnhancers(middlewares, persistStateEnhancer);
   }
 
-  const store = createStore(reducers, {}, enhancer);
+  const store = createStore(reducers, {}, enhancer) as Store;
 
   // Hot reload reducers
   if (module.hot && typeof module.hot.accept === 'function') {