How to use the buefy.default function in buefy

const AlternativeWidget = require('./components/themes/main/widgets/alternative_widget/AlternativeWidget.vue');
const MediaWidget = require('./components/themes/main/widgets/media_widget/MediaWidget.vue');


const App = require('./pages/App.vue');


const LOCALE = BrowserUtils.getDefaultLanguage();
moment.locale(LOCALE.toLowerCase());

Object.defineProperty(Vue.prototype, '$lodash', { value: _ });

Vue.use(VueScrollTo);
Vue.use(SocialSharing);

Vue.use(Buefy.default, {
    defaultIconPack: 'fa',
});

Vue.use(VueWysiwyg.default, {
    hideModules: { image: true },
});

Vue.component('loader', Loader);
Vue.component('stepper', Stepper);
Vue.component('fform', Form);
Vue.component('finput', Input);
Vue.component('fcolor', ColorInput);
Vue.component('fselect', Select);
Vue.component('fstatic', Static);
Vue.component('fdropzone', Dropzone);
Vue.component('fhselect', HierarchicalSelect);

const Dropzone = require('../common/components/main/forms/dropzone/Dropzone.vue');

const ActionButton = require('./components/themes/main/components/action_button/ActionButton.vue');
const Widget = require('../common/components/main/widget/Widget.vue');

const App = require('./pages/App.vue');

Vue.use(VueScrollTo);


const introJs = require('intro.js');

window.introJs = introJs;
Vue.use(VueIntro);

Vue.use(Buefy.default, {
    defaultIconPack: 'fa',
});

Vue.use(VueWysiwyg.default, {
    hideModules: { image: true },
});

Vue.component('loader', Loader);
Vue.component('fform', Form);
Vue.component('finput', Input);
Vue.component('fcolor', ColorInput);
Vue.component('fselect', Select);
Vue.component('fstatic', Static);
Vue.component('fgrid', Grid);
Vue.component('fvariadic-element', VariadicElement);
Vue.component('fdropzone', Dropzone);