Working With Stylesheets: Less

Mix.less('resources/less/app.less', 'public/css');

Mix.less('resources/less/app.less', 'public/css')
   .less('resources/less/admin.less', 'public/css');

Mix.less('resources/less/app.less', 'public/stylesheets/styles.css');

Mix.less('resources/less/app.less', 'public/css', {
    strictMath: true
});