vue.js router guard

vue.js

import Vue from 'vue'
import VueRouter from 'vue-router'
import firebase from 'firebase'
import signIn from './sign-in.vue'

Vue.use(VueRouter);

const router = new VueRouter({
	routes: [
		{
			path: '/',
			template: '<div>Main</div>'

		},
		{
			path: '/login',
			component: signIn
		},
		{
			path: '/tasks', component: {
			template: '<div>Task</div>'
		}
		},
		{
			path: '/chats', component: {
			template: '<div>Chat</div>'
		}
		}
	],
	beforeEach: (to, from, next) => {
		if (firebase.auth().currentUser == null && to.path.toLowerCase() != '/login') next('/login');

		next();
	}
});

export default router;