Vuejs-Vuex延迟加载

我有一个相当大的VueJS SPA,我只是想使用懒惰的负载在某些路由上加载Vuex模块。

我是为了复制这篇文章- https://alexjoverm.github.io/2017/07/16/Lazy-load-in-Vue-using-Webpack-s-code-splitting/

但是这给了我一个Vuex错误。

文件夹结构

root
  |- store
  | |- modules
  | | |- auth.js
  | | |- module2.js
  | |- store.js
  |- app.js

认证JS

const state = {
    var1: {},
    var2: false
}

const mutations = {
    'MUTATION_1'(state, obj) {
        // logic
    }
}

const actions = {
    action1({commit}) {
       // logic
    }
}

const getters = {
    var1: state => state.var1,
    var2: state => state.var2
}

export default {
    state,
    mutations,
    actions,
    getters
}

商店.js-

import Vue from 'vue';
import Vuex from 'vuex';

Vue.use(Vuex);
const store = new Vuex.Store();

import('./modules/auth.js').then(auth => {
    store.registerModule('/login', auth);
});

export default store;

应用程序JS-

import Vue from 'vue';
import store from './store/store';
import VueRouter from 'vue-router';
import { routes } from './routes/routes';

// vue-router config
Vue.use(VueRouter);

const router = new VueRouter({
    mode: 'history',
    routes
});

const app = new Vue({
    el: '#app',
    store,
    router
});

错误-

[vuex] unknown getter: var1

有什么建议吗?