let mix = require('laravel-mix').mix;

/*
 |--------------------------------------------------------------------------
 | Mix Asset Management
 |--------------------------------------------------------------------------
 |
 | Mix provides a clean, fluent API for defining some Webpack build steps
 | for your Laravel application. By default, we are compiling the Sass
 | file for the application as well as bundling up all the JS files.
 |
 */

mix.js('resources/assets/js/app.js', 'public/js')
   .sass('resources/assets/sass/app.scss', 'public/css');

@@ -1,11 +1,17 @@
-let
+const %7B
  mix
+ %7D
  = r
@@ -35,12 +35,8 @@
 ix')
-.mix
 ;%0A%0A/

Use const and destructuring assignment