How about

<script setup lang="ts">importbuttonfrom'./button.vue'</script><template>  <button>{{ button }}</button></template>

How about

<script setup lang="ts">import button from './button.vue'</script><template>  <button>{{ button }}</button></template>

This is the effect of the official scaffolding of vite + vue3
demo：https://stackblitz.com/edit/vitejs-vite-beh2mo?file=src%2FApp.vue

And. This is the effect of running after this commit

Do we need to add more test cases？

Yes, we need more test case.

Include

importbuttonfrom'./button.vue'importButtonfrom'./button.vue'

Is there any work to be done about this PR@xiaoxiangmoe

@xiaoxiangmoe I'm ready to review, bro ^_^