src/main.js

// The Vue build version to load with the `import` command
// (runtime-only or standalone) has been set in webpack.base.conf with an alias.
import '@/config'
import Vue from 'vue'
import App from './App'
import router from './routers'
import store from '@/store'
import PageHeader from '@/components/PageHeader'
window.store = store
// QUESTION - ??
Vue.config.productionTip = false

// Bootstraps Global Components
Vue.component('PageHeader', PageHeader)

/* eslint-disable no-new */
new Vue({
  el: '#app',
  store, // Vuex Store - QUESTION - why is this not available to all child components as `this.$store`?
  router: router,
  template: '<App/>',
  components: { App }
})