vue.prototype is undefined on sweealert in vue cli

Question

The following code:

import { createApp } from "vue";

import App from "./App.vue";
import "./registerServiceWorker";
import router from "./router";
import store from "./store";
import axios from "axios";
import VueAxios from 'vue-axios';
import sweetalert from 'vue-sweetalert2'
window.URL='//127.0.0.1:8000/api/';

createApp(App)
  .use(store)
  .use(router)
  .use(sweetalert)
  .use(VueAxios, axios)
  .mount("#app");

Gives me this error in vue cli:

Uncaught TypeError: vue.prototype is undefined

Why?

Answer 1

vue-sweetalert2 is not yet supporting Vue@3, as you can see here vue-sweetalert2 using Vue@2 that reason why you're seeing that error (vue.prototype is undefined) B'cause prototype is not available in Vue@3.

I have created a support issue here, you can keep track on this.