If not given a variable initialization, it will cause compilation error

[es3154]

In <script setup> declare a variable, if not initialization can cause compilation exceptions，

**Module Error (from ./node_modules/unplugin-vue2-script-setup/node_modules/unplugin/dist/webpack/loaders/transform.js):
Cannot read property 'callee' of null
**

`<script setup>

defineProps(["msg"]);

let s;
// let s = 2;

</script>`

unplugin-vue2-script-setup": 0.6.7
@vue/composition-api: 1.1.0,
vue: ^2.6.14
webpack": "^5.50.0

https://github.com/es3154/vue2ScriptSetupTest