Plugin fails when parsing .vue-file without <template>

[johannes-z]

There is already an open pull request: #11

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I have several Components in my project that use render functions, but are defined as .vue to allow using <style> tags. This plugin fails if no <template> is specified.

[vite] Internal server error: Cannot read properties of null (reading 'lang'

The error stems from this LOC:

vite-plugin-vue2/src/main.ts

Line 182 in e686728

if (!template.lang && !template.src) {

(template is undefined).

This if should also check for an undefined template.

Repro: https://github.com/johannes-z/repro_vite-plugin-vue2-templates

Works

<template>
  <div>
    <!-- dummy -->
  </div>
</template>

<script lang="ts">
import Vue, { h, defineComponent } from 'vue'
export default defineComponent({
  setup() {
    return () => h('div', 'Test')
  }
})
</script>

Doesn't Work

<script lang="ts">
import Vue, { h, defineComponent } from 'vue'
export default defineComponent({
  setup() {
    return () => h('div', 'Test')
  }
})
</script>