vue.js - "export 'default' (imported as 'Vue') was not found in 'vue'

Question

I am a beginner with VueJs and this is my first App:

import { BootstrapVue } from 'bootstrap-vue'
import { createApp } from 'vue'
import App from './App.vue'
    
const myApp = createApp(App)
myApp.use(BootstrapVue)
myApp.mount('#app')

And when I save, nothing appears in my browser and it show this message in the Command:

warning  in ./src/main.js

"export 'default' (imported as 'Vue') was not found in 'vue'

Answer 1

Bootstrap-Vue does not yet support Vue 3. So if you want to use Bootstrap-Vue you will have to stick with Vue 2 for now.

In general, most of the libraries don't support Vue 3 yet, so I would suggest waiting a bit longer before using it until the ecosystem has caught up.

Explanation

The reason this is happening is because in Vue 2, Vue provides a default export export default vue, which allows BootstrapVue to use import Vue from 'vue'.

However, in Vue 3 this has changed, and Vue does no longer provide a default export, and instead uses named exports. So when BootstrapVue uses the following line import Vue from 'vue', the error occurs.