[1] Add pages/_app.vue

Default:

<template>
  <nuxt></nuxt>
</template>

Can be for example: https://github.com/vuejs/vue-hackernews-2.0/blob/master/src/App.vue

And replacing:

<transition name="fade" mode="out-in">
   <router-view class="view"></router-view>
</transition>

By:

<nuxt class="view"></nuxt>

Have to register Vue.component('nuxt', 'Nuxt.vue') (actual App.vue)

What about app.error() -> app.nuxt.error(), same for app.$loading

// Nuxt.vue
created() {
  this.$root.nuxt = thi
}

BOUM :tada: