The annotated code is also parsed. export default

[buledong]

Describe the bug

The annotated code is also parsed, export default

Reproduction

Basic repo
https://github.com/buledong/repro-vite-duplicate-export-default

<script>
export default {
};
// export default class MasterLevel extends Vue {
// };
</script>

System Info

• vite version: 2.0.1 & 2.0.3
• Operating System: win & mac
• Node version: 12.16.1
• Package manager (npm/yarn/pnpm) and version: 6.14.10 & 7

Logs (Optional if provided reproduction)

import { createHotContext as __vite__createHotContext } from "/@vite/client";import.meta.hot = __vite__createHotContext("/src/App.vue");
//  here 
export default {
};

// class MasterLevel extends Vue {
// };

const _sfc_main = MasterLevel
import { createVNode as _createVNode, openBlock as _openBlock, createBlock as _createBlock } from "/node_modules/.vite/vue.js?v=33206dcc"

const _hoisted_1 = {
  alt: "Vue logo",
  src: "/src/assets/logo.png"
}

function _sfc_render(_ctx, _cache, $props, $setup, $data, $options) {
  return (_openBlock(), _createBlock("img", _hoisted_1))
}

import "/src/App.vue?vue&type=style&index=0&lang.css"

_sfc_main.render = _sfc_render
_sfc_main.__file = "C:/Users/zhaolian/Downloads/repro-vite-duplicate-export-default-master/repro-vite-duplicate-export-default-master/src/App.vue"
// and here
export default _sfc_main
_sfc_main.__hmrId = "7ba5bd90"
typeof __VUE_HMR_RUNTIME__ !== 'undefined' && __VUE_HMR_RUNTIME__.createRecord(_sfc_main.__hmrId, _sfc_main)
import.meta.hot.accept(({ default: updated, _rerender_only }) => {
  if (_rerender_only) {
    __VUE_HMR_RUNTIME__.rerender(updated.__hmrId, updated.render)
  } else {
    __VUE_HMR_RUNTIME__.reload(updated.__hmrId, updated)
  }
})