Should not use vue inner util, after upgrade everything doesn't worked

latest version of vue-demi added var warn = Vue.util.warn cause all old webpack build doesn’t worked

import Vue from 'vue'

var isVue2 = true
var isVue3 = false
var Vue2 = Vue
var warn = Vue.util.warn

this error is Vue.util is undefined

[sctouch]

It’s Vue.util.warn and fails at Vue.util. The screenshots suggest it should be Vue.default.util.warn but then everything also in this file also needs to be changed. I will take a look once it can be reproduced. I couldn’t reproduce on a nuxt 2 project either: https://github.com/piniajs/example-nuxt-2

@posva you have build or generate the project, next you have to start the project in your local yarn start and you will see the error.

[sctouch]

Yes, the same issue on 0.13.9 or 0.13.10. after nuxt generate.