Version

3.1.1

Reproduction link

https://codesandbox.io/s/bug-vue-script-tsx-4um6n?file=/src/views/todo-script-tsx.vue

Steps to reproduce

1. current page show you is script-tsx, everything is correct,you can add one thing (at script-tsx page)
2. click the link which is called tsx, the page is correct, it will list all you added, you can add one thing again (at tsx page)
3. back to script-tsx ,the page will not list all things, when you add one ,it will not list at all (at script tsx page)

What is expected?

the script-tsx page can list all things i added when i back to this page

What is actually happening?

it will not list all things, and i can't add things any more

I'm a bit unsure what you are trying to achieve here.

<script setup> is definitely not designed to export default a functional TSX component.

It's designed to work with a template. for the most part, it exists so you can have an authoring experience similar to that of a .tsx file - no need to register components etc.

I'm a bit unsure what you are trying to achieve here.

<script setup> is definitely not designed to export default a functional TSX component.

It's designed to work with a template. for the most part, it exists so you can have an authoring experience similar to that of a .tsx file - no need to register components etc.

I submit a discussion in rfcs,i think there should be no restrictions for tsx or template, it just as a simplified way to write setup function https://github.com/vuejs/rfcs/discussions/330