Vue3 - Persisting state with Page refresh - vue.js

Question

I have just started using Vue3, and am trying to use vuex to manage state. when using Vue2 I would call the store each time the app loads like this:
// mains.js
import VueRouter from "vue-router";
import Vuex from "vuex";
import router from "./routes";
window.Vue = require('vue').default;
Vue.use(VueRouter);
Vue.use(VueMoment);
Vue.use(Vuex);
const store = new Vuex.Store(storeDefinition);
const app = new Vue({
el: '#app',
router,
store,
components: {
"index": Index
},
async created() {
this.$store.dispatch("loadStoredState");
this.$store.dispatch("loadUser");
},
});
This is my vuex store that defines state, mutations and actions for vuex:
// store.js
import { isLoggedIn, logOut } from "./shared/utils/auth";
export default {
state: {
isLoggedIn: false,
user: {}
},
mutations: {
setUser(state, payload) {
state.user = payload;
},
setLoggedIn(state, payload) {
state.isLoggedIn = payload;
}
},
actions: {
loadStoredState(context) {
context.commit("setLoggedIn", isLoggedIn());
},
async loadUser({ commit, dispatch }) {
if (isLoggedIn()) {
try {
const user = (await axios.get("/user")).data;
commit("setUser", user);
commit("setLoggedIn", true);
} catch (error) {
dispatch("logout");
}
}
},
logout({ commit }) {
commit("setUser", {});
commit("setLoggedIn", false);
logOut();
}
},
getters: {}
}
This file manages a cookie for local storage that stores a boolean value for isLoggedIn:
// auth.js
export function isLoggedIn() {
return localStorage.getItem("isLoggedIn") == 'true';
}
export function logIn() {
localStorage.setItem("isLoggedIn", true);
}
export function logOut() {
localStorage.setItem("isLoggedIn", false);
}
But in Vue3 I am creating the main.js file like this:
// mains.js
const { createApp } = require('vue')
import Index from './Index.vue'
import createRouter from './router'
import { createStore } from 'vuex'
import storeDefinition from "./store";
const store = createStore(storeDefinition)
createApp(Index)
.use(createRouter())
.use(store)
.mount('#app')
How can I add the two calls to manage the store to the createApp function?

Answer 1

You can add the created hook to the root component by using the extends option with the component definition:
// main.js
import { createApp } from 'vue'
import Index from './Index.vue'
import createRouter from './router'
import { createStore } from 'vuex'
import storeDefinition from './store'
const store = createStore(storeDefinition)
createApp({
extends: Index,
created() {
this.$store.dispatch('loadStoredState')
this.$store.dispatch('loadUser')
},
})
.use(createRouter())
.use(store)
.mount('#app')
demo