how to Install plugin but not createApp？

[uCloudCastle]

In Vue2 we have a plugin use like that：
import Plugin from 'aviana-plugin-vue' Vue.use(Plugin, { ...config, createRouter: root => { return new Router({ routes: Plugin.buildRoutes(routes, root), }) }, createInstance: (container, router) => { return new Vue({ router: router, store: store, render: h => h(App), }).$mount(container ? container.querySelector('#app') : '#app') }, })

as the code snippet，we didn't create vue app in main.ts，Instead we deliver "createInstance" function to the plugin so it can create instance in suitable time。

In Vue3 we try this way:
import Plugin from 'aviana-plugin-vue' const app = createApp(App) // wrong but we need the “app.use” app.use(Plugin, { ...config, createRouter: (root) => { return createRouter({ history: createWebHashHistory(), routes: Plugin.buildRoutes(routes, root), }) }, createInstance: (container: any, router: any) => { // const app = createApp(App) // it should be here app.use(store) app.use(router) app.mount(container ? container.querySelector('#app') : '#app') return app }, })

But this is contrary to our expectation，this instance should not be created so early。so how to Install plugin but not createApp，just like Vue2 did？

[uCloudCastle]

import Plugin from 'aviana-plugin-vue'
const app = createApp(App)  // wrong but we need the “app.use”
app.use(Plugin, {
  ...config,
  createRouter: (root) => {
    return createRouter({
      history: createWebHashHistory(),
      routes: Plugin.buildRoutes(routes, root),
    })
  },
  createInstance: (container: any, router: any) => {
    // const app = createApp(App) // it should be here
    app.use(store)
    app.use(router)
    app.mount(container ? container.querySelector('#app') : '#app')
    return app
  },
})