vue_module/proj/index.js

import Vue from 'vue'
import App from './App'

Vue.config.productionTip = false
Vue.config.silent = true

openerp.vue_module = (instance, local) => {
    local.VueWidget = instance.Widget.extend({
        start() {
            this.vm = new Vue({
                el: this.el,
                template: '<App />',
                components: { App }
            })
        },
        destroy() {
            this.vm.$destroy()
            $(this.vm.$el).remove()
            this.vm = null
        }
    })

    instance.web.client_actions.add('vue_module.vue_module_action', 'instance.vue_module.VueWidget')
}