Navigation-back detector for vue@2 vue-router@3 http://codepen.io/barname_nevis/pen/jOZQwby

App.js

// basic usage
import Vue from 'vue'
import VueRouter from 'vue-router'
import VueNavbackDetector from './vue-navback-detector.js'

const routes = []
const router = new VueRouter({ routes })
Vue.use(VueNavbackDetector, { router })
new Vue({ router }).$mount('#app')

navback-detect.client.js

// use as nuxt@2 plugin 
import Vue from 'vue'
import VueNavbackDetector from './vue-navback-detector.js'

export default function (ctx, inject) {
  Vue.use(VueNavbackDetector, { router: ctx.app.router })
}

vue-navback-detector.js

export default {
  install (Vue, options) {
    const opts = { globalKey: '__VueRouterIsNavback', router: null, ...options }

    function handlePop () { window[opts.globalKey] = true }
    function handlePush () { window[opts.globalKey] = false }

    // attach
    window[opts.globalKey] = false
    window.addEventListener('popstate', handlePop)
    opts.router.afterEach(() => setTimeout(handlePush, 0))

    // instance access
    Object.defineProperty(Vue.prototype, '$isNavback', {
      get () { return window[opts.globalKey] }
    })
  }
}