auth.js

import firebase from '@store/firebase'
import store from '@store'
import { USER } from '@store/types'

export default async (to, from, next) => {
	if (to.name === 'Sign in') {
		next()
		return
	}

	await firebase.auth().onAuthStateChanged(user => {
		if (user) {
			store.dispatch(USER, user)
			next()
		}
		else next({ name: 'Sign in' })
	})
}