What is the process for specifying the type for the createApp(App) function in Vue.js 3?

I'm currently working with Vue3 and Firebase using TypeScript.

// main.ts
import { createApp } from 'vue'
import App from './App.vue'
import './registerServiceWorker'
import router from './router'
import store from './store'
import { auth } from './firebase'

// eslint-disable-next-line
let application: any

auth.onAuthStateChanged(() => {
  if (!application) {
    application = createApp(App)
      .use(store)
      .use(router)
      .mount('#app')
  }
})

Can anyone advise on the correct type to set for the 'application' variable? I've attempted App and typeof App without success.

typescriptvue.jsvuejs3

Answer №1

createApp will give you back an App instance. If you have already imported an App, make sure to rename the type during import. Keep in mind that app.mount will return a different type, so you cannot chain it directly after createApp unless you adjust the type:

import { createApp, App as Application } from 'vue'
import App from './App.vue'
// other imports

let app: Application 

auth.onAuthStateChanged(() => {
  if (!app) {
    app = createApp(App)
    app.use(store)
    app.use(router)
    app.mount('#app')
  }
})

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