import {defineComponent,createApp} from 'vue'

buttonView = defineComponent({
    extends: Button, data() {
        return {
            type: "1111"
        }
    }
})

const div = document.createElement('div');
this.$refs.container.appendChild(div);
createApp(buttonView ).mount(div)

Here's how to do with createApp in Vue 3, but the context (stores, plugins, directives...) will not be kept.

Copy// DialogService.js
import { createApp } from 'vue';

export default {
  alert(text) {
    const mountEl = document.createElement('div');
    document.body.appendChild(mountEl);

    const dialog = createApp({ extends: DialogComponentDef }, {
      // props
      text,
      // events are passed as props here with on[EventName]
      onClose() {
        mountEl.parentNode.removeChild(mountEl);
        dialog.unmount();
        dialog = null;
      },
    });

    dialog.mount(mountEl);
  },
};

To keep the context, there's something more complicated that can be seen here with h and render Vue methods : https://github.com/vuejs/vue-next/issues/2097#issuecomment-709860132

https://github.com/pearofducks/mount-vue-component

Use createApp instead of Vue.extend here's a example of simple vue3 components programmatically

import Button from 'Button.vue'
import { createApp } from "vue"
// Creating the Instance
// use createApp https://v3.vuejs.org/api/global-api.html#createapp
var ComponentApp = createApp(Button)
import Button from "./Button.vue"

// inserting to dom
const wrapper = document.createElement("div")
ComponentApp.mount(wrapper)
document.body.appendChild(wrapper)

set props or slot is a little different by use h, https://v3.vuejs.org/api/global-api.html#h

import Button from 'Button.vue'
import { createApp, h } from "vue"

var ComponentApp = createApp({ 
  setup () {
    return () => h(Button, {type: "primary"}, "default slot as children")
  }
})