[Vuejs]-Store data in local storage

@Roy J already provided the CDN link in the comments (https://cdn.rawgit.com/robinvdvleuten/vuex-persistedstate/9d79a3e0/dist/vuex-persistedstate.min.js).

But besides that you also need to pass the vuex-persistedstate as a plugin to Vuex:

import createPersistedState from 'vuex-persistedstate';

const store = new Vuex.Store({
  // ...
  plugins: [createPersistedState()]
});

Read their docs over at Github: vuex-persistedstate