[1615] new version nuxt not surpport async component?

I have load editor component async like bellow:

...
async created () {
      const editor = await import('~/components/editor.vue')
      Vue.component('editor', editor)
}
...

but when I upgrade the nuxt version to ^1.0.0-rc8 ， the editor component can't load, has some where changed?

the source code is here https://github.com/awesomes-cn/new-awesomes/blob/master/components/comment.vue#L184