title: Laravel mix doesn't compile sass
body: <p>I have a problem in my laravel mix configuration, I think. When I compile, it didn't emit app.css.</p>
  
  <pre><code>
                                                                                 Asset      Size                             Chunks             Chunk Names
                                                                          /css/app.css   0 bytes  /js/app, /js/manifest, /js/vendor  [emitted]  /js/app, /js/manifest, /js/vendor
                                                                            /js/app.js  6.61 MiB                            /js/app  [emitted]  /js/app
                                                                       /js/manifest.js  9.03 KiB                       /js/manifest  [emitted]  /js/manifest
                                                                         /js/vendor.js   885 KiB                         /js/vendor  [emitted]  /js/vendor
                                                                              about.js  15.2 KiB                              about  [emitted]  about
                                                                            arcicle.js  33.9 KiB                            arcicle  [emitted]  arcicle
                                                                          dashboard.js   8.9 KiB                          dashboard  [emitted]  dashboard
    fonts/vendor/@mdi/materialdesignicons-webfont.eot?3e2c1c7919fb45d5dee5b0703fe52931   842 KiB                                     [emitted]  
    fonts/vendor/@mdi/materialdesignicons-webfont.ttf?e7dec9c5e1bd830c084f2d2fb94fa1e7   842 KiB                                     [emitted]  
  fonts/vendor/@mdi/materialdesignicons-webfont.woff2?a323c28ecd42189e70efca274f5b7089   276 KiB                                     [emitted]  
   fonts/vendor/@mdi/materialdesignicons-webfont.woff?2dcce27160495d68abf4945acd282448   390 KiB                                     [emitted]  
                                                                              login.js    32 KiB                              login  [emitted]  login
                                                                             logout.js  18.3 KiB                             logout  [emitted]  logout
  </code></pre>
  
  <p>However, if I try without the extract options, I get:</p>
  
  <pre><code>
  /*
   |--------------------------------------------------------------------------
   | 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/js/app.js', 'public/js')
     .sourceMaps()
  
  mix.sass('resources/sass/app.scss', 'public/css')
  </code></pre>
  
  <p>It compiled!</p>
  
  <pre><code>
  98% after emitting SizeLimitsPlugin
  
   DONE  Compiled successfully in 6999ms                                                                                                                           13:46:28
  
                                                                                 Asset       Size     Chunks             Chunk Names
                                                                          /css/app.css  142 bytes    /js/app  [emitted]  /js/app
                                                                            /js/app.js   7.45 MiB    /js/app  [emitted]  /js/app
                                                                              about.js   15.2 KiB      about  [emitted]  about
                                                                            arcicle.js   33.9 KiB    arcicle  [emitted]  arcicle
                                                                          dashboard.js    8.9 KiB  dashboard  [emitted]  dashboard
    fonts/vendor/@mdi/materialdesignicons-webfont.eot?3e2c1c7919fb45d5dee5b0703fe52931    842 KiB             [emitted]  
    fonts/vendor/@mdi/materialdesignicons-webfont.ttf?e7dec9c5e1bd830c084f2d2fb94fa1e7    842 KiB             [emitted]  
  fonts/vendor/@mdi/materialdesignicons-webfont.woff2?a323c28ecd42189e70efca274f5b7089    276 KiB             [emitted]  
   fonts/vendor/@mdi/materialdesignicons-webfont.woff?2dcce27160495d68abf4945acd282448    390 KiB             [emitted]  
                                                                              login.js     32 KiB      login  [emitted]  login
                                                                             logout.js   18.3 KiB     logout  [emitted]  logout
  
  
  </code></pre>
  
  <p>I used vue and vuetify. I tried to find a solution, but I can't figure out what am I doing wrong...</p>