<script setup> must has attribute `lang="js"` ?

[zhanglolo]

I like this plugin, great idea!!!

Here are my doubts：

if script don't has attribute lang="js" then get an error

[plugin:vue2-script-setup-transform] Unsupported script language: undefined

add to fix it, is something miss in document or just a bug?

The point of the error code：

if (lang === 'ts')
  plugins.push('typescript')
else if (lang === 'jsx')
  plugins.push('jsx')
else if (lang === 'tsx')
  plugins.push('typescript', 'jsx')
else if (lang !== 'js')
  throw new SyntaxError(`Unsupported script language: ${lang}`)

source code:

<template>
  <div>
    <h1>{{ msg }}</h1>
  </div>
</template>

<script setup>
import { ref } from "@vue/composition-api";

const msg = ref("bar")
</script>

<style></style>