webpack.mix.js use .vue() const mix = require ( 'laravel-mix' ); /* |-------------------------------------------------------------------------- | Mix Asset Management |-------------------------------------------------------------------------- | | Mix provides a clean, fluent API for defining some Webpack build steps | for your Laravel applications. By default, we are compiling the CSS | file for the application as well as bundling up all the JS files. | */ mix. js ( 'resources/js/app.js' , 'public/js' ) . vue () . postCss ( 'resources/css/app.css' , 'public/css' , [ // ]); ref link https://laravel-mix.com/docs/6.0/upgrade