0👍
you should write .default at end of require vue components because of part of the vue-loader 15 updates, if your code uses the CommonJS syntax for importing EcmaScript modules, you’ll need to append .default:
https://laravel-mix.com/docs/4.0/upgrade#importing-es-modules
but as @Ifaruki said you can import it too here’s the code:
// first
Vue.component('favourup', require('./components/Favourup.vue').default);
// second
import Favourup from './components/Favourup.vue';
Vue.component('favourup', Favourup);
Source:stackexchange.com