Vue SFC: Duplicate export of 'default'

[ChrisShank]

Describe the bug

When the default export of a Vue SFC is written as export { HelloWorld as default } the following error occurs: Uncaught SyntaxError: Duplicate export of 'default'. I think that a fix might be related to commit 59938bc.

Reproduction

Let me know if you need a reproducer...

System Info

• required vite version: v1.0.0-rc.3
• required Operating System: Windows 10
• required Node version: v14.4.0
• Optional:
  • npm/yarn version: yarn v1.22.4
  • Installed vue version (from yarn.lock or package-lock.json): 3.0.0-rc.4
  • Installed @vue/compiler-sfc version: 3.0.0-rc.4

Logs (Optional if provided reproduction)

This is the output of the rewrite of components/HelloWorld.vue

const HelloWorld = {
  name: 'HelloWorld',
  props: {
    msg: String
  },
  data() {
    return {
      count: 0
    }
  }
}

export { HelloWorld as default }

import { render as __render } from "/src/components/HelloWorld.vue?type=template"
__script.render = __render
__script.__hmrId = "/src/components/HelloWorld.vue"
__script.__file = "<local path to file>"
export default __script

[ChrisShank]

Thanks for the fix @underfin! ❤️ I was also experiencing the same edge case in your vite-plugin-vue2 if you have a chance to look into it!

[underfin]

Yeah.I will fix it.