How can I import all .scss files automatically?

Hi, My laravel resources app structure is like this:

• resources
  • vuesin
    • components
      • Tree
        • _tree.scss
        • Tree.vue
        • ...

Now, how can I import all .scss files automatically in laravel mix? I try below code, but it doesn't work:

// Import Vuesin Scss
const files = require.context('./resources/packets/vuesin/components', true, /\.scss$/);
let styles = [];

files.keys().map(function (key) {
    styles.push(files(key));
});