Подключаем работу с Vuex

client/main.js

@@ -2,11 +2,13 @@ import Vue from 'vue';
 import App from './components/App.vue';
 import ElementUI from 'element-ui';
 import 'element-ui/lib/theme-chalk/index.css';
+import store from './store';
 
 //Vue.config.productionTip = false;
 
 Vue.use(ElementUI);
 
 new Vue({
+    store,
     render: h => h(App),
 }).$mount('#app');