getting require is not defined error in vue

Question

I have used the same code which is present on below link. github

    Vue.http.options.root = '/root';
    Vue.http.headers.common['Authorization'] = 'Basic YXBpOnBhc3N3b3Jk';
    new Vue({
      http: {
        root: '/root',
        headers: {
          Authorization: 'Basic YXBpOnBhc3N3b3Jk'
        }
      }
    })
    var Vue = require('vue');
    var VueResource = require('vue-resource');
    Vue.use(VueResource);