Login state service

stat.js

angular.module('AuthModule', ['localStorage']).factory('AuthState', function(localStorage) {
    'use strict';
    var state = {
        isLoggedIn: localStorage.get('isLoggedIn')
    };
    return {
        isLoggedIn: isLoggedIn,
    };
});
angular.module('controllers', ['AuthState']).factory('SomeCtrl', function($scope, state) {
    $scope.state = state.isLoggedIn;
});

angular.module('controllers', ['AuthState']).factory('SomeCrl', function($scope, state) {
    $scope.state = state.isLoggedIn;
    $scope.$watch('state', function() {
        // your code here
        console.log('Log in state change');
    });
});