If you do not export default it in <setup>, the import will report an error

[hairyf]

HelloWorld.vue

<script setup="props" lang="ts">
import { computed, ref, watchEffect } from 'vue'
declare const props: {
  msg: string
}
export const count = ref(0);
export const computedMsg = computed(()=> props.msg + "!!!!")
watchEffect(()=>{
  console.log(computedMsg.value)
})

export default {}
</script>

App.vue

<script setup lang="ts">
// Module '"./components/HelloWorld.vue"' has no exported member 'default'.Vetur(2305)
export { default as HelloWorld } from './components/HelloWorld.vue';
</script>

[yoyo930021]

Duplicate of #2296

[yoyo930021]

Please don't open new issue.
Follow #2296
No support yet.