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You might need to uncomment the require line in your app.js. On Laravel 5.4 it’s located in the /resources/assets/js/app.js file.
/**
* First we will load all of this project's JavaScript dependencies which
* includes Vue and other libraries. It is a great starting point when
* building robust, powerful web applications using Vue and Laravel.
*/
require('./bootstrap');
/**
* Next, we will create a fresh Vue application instance and attach it to
* the page. Then, you may begin adding components to this application
* or customize the JavaScript scaffolding to fit your unique needs.
*/
// Vue.component('example', require('./components/Example.vue'));
// ^^^^^^^^^^^^^^^^^^^^^^ Uncomment this line ^^^^^^^^^^^^^^^^^^^^^^
const app = new Vue({
el: '#app'
});
Source:stackexchange.com