use null instead of Map for empty user field in store

Author: TimMikeladze

packages/client/src/AccountsClient.js

@@ -81,8 +81,9 @@ export class AccountsClient {
     return Promise.resolve(this.storage.removeItem(keyName));
   }
 
-  user(): UserObjectType {
-    return this.getState().get('user').toJS();
+  user(): UserObjectType | null {
+    const user = this.getState().get('user');
+    return user ? user.toJS() : null;
   }
 
   async tokens(): Promise<TokensType> {
@@ -250,7 +251,7 @@ const Accounts = {
       ...options,
     }, transport);
   },
-  user(): UserObjectType {
+  user(): UserObjectType | null {
     return this.instance.user();
   },
   options(): Object {

packages/client/src/module.js

@@ -8,7 +8,7 @@ const LOGGING_IN = `${PATH}LOGGING_IN`;
 
 const initialState = Map({
   isLoading: false,
-  user: Map(),
+  user: null,
   loggingIn: false,
 });
 
@@ -23,7 +23,7 @@ const reducer = (state = initialState, action) => {
       return state.set('user', Map(user));
     }
     case CLEAR_USER: {
-      return state.set('user', Map());
+      return state.set('user', null);
     }
     case LOGGING_IN: {
       const { isLoggingIn } = action.payload;