does this now require coffeescript support?

I got a basic site right now from vue cli's init webpack foo, with vuex2

I'm getting in the browser 'Error when rendering root instance' and 'Uncaught ReferenceError: _h is not defined'.

my App.vue looks like:

<template>
  <div id="app">
    <img src="./assets/logo.png">
    <side-nav>
      <app-nav />
    </side-nav>
    <container>
      <router-view />
    </container>
  </div>
</template>

<script>
import SideNav from 'vue-side-nav'
import Nav from './components/Nav.vue'

export default {
  name: 'app',
  components: {
    sideNav: SideNav,
    appNav: Nav
  }
}
</script>

and that Nav.vue is just

<template>
  <li id="nav" class="component sidebar">Nav</li>
</template>

<script>
</script>

<style scoped>
</style>

producing:

[Vue warn]: Error when rendering root instance: 
warn
localhost/:2225 Uncaught ReferenceError: _h is not defined
    at Proxy.__vue__options__.render (eval at <anonymous> (app.js:1113), <anonymous>:173:49)
    at VueComponent.Vue._render (eval at <anonymous> (app.js:723), <anonymous>:2216:22)
    at VueComponent.updateComponent (eval at <anonymous> (app.js:723), <anonymous>:2609:21)
    at Watcher.get (eval at <anonymous> (app.js:723), <anonymous>:2934:27)
    at new Watcher (eval at <anonymous> (app.js:723), <anonymous>:2926:12)
    at VueComponent.Vue._mount (eval at <anonymous> (app.js:723), <anonymous>:2608:19)
    at VueComponent.Vue$3.$mount (eval at <anonymous> (app.js:723), <anonymous>:6178:15)
    at VueComponent.Vue$3.$mount (eval at <anonymous> (app.js:723), <anonymous>:8549:16)
    at creator (eval at <anonymous> (app.js:1119), <anonymous>:9:31)
    at VueComponent.created (eval at <anonymous> (app.js:1132), <anonymous>:7:50)

If I revert App.vue:

<template>
  <div id="app">
    <img src="./assets/logo.png">
    <app-nav />
    <router-view></router-view>
  </div>
</template>

<script>
import Nav from './components/Nav.vue'
export default {
  name: 'app',
  components: {
    appNav: Nav
  }
}
</script>

works perfectly well

vue-comps / vue-side-nav

does this now require coffeescript support? #7