chore(build): create dist folder if needed in 'gulp clean' task

gulpfile.js

@@ -10,8 +10,8 @@ const browserSync = require('browser-sync').create()
 const packageJson = require('./package.json')
 const execute = require('./utils/execute')
 const log = require('fancy-log')
+const fs = require('fs')
 const version = process.env.VERSION || packageJson.version
-const fsPromises = require('fs').promises
 
 const banner = `/*!
 * ${packageJson.name} v${version}
@@ -30,12 +30,16 @@ const skipStandalone = process.argv.includes('--skip-standalone')
 // ---
 
 gulp.task('clean', () => {
-  return fsPromises.readdir('dist')
+  if (!fs.existsSync('dist')) {
+    fs.mkdirSync('dist')
+  }
+
+  return fs.promises.readdir('dist')
     .then(fileList => {
       if (fileList.length > 0) {
         let unlinkPromises = []
         fileList.forEach(fileName => {
-          unlinkPromises.push(fsPromises.unlink(`dist/${fileName}`))
+          unlinkPromises.push(fs.promises.unlink(`dist/${fileName}`))
         })
         return Promise.all(unlinkPromises)
       }

src/mixins.scss

@@ -13,7 +13,7 @@
   $not-output: '';
 
   @each $not in $ignor-list {
-    $not-output: $not-output + ':not(#{$not})'; /* stylelint-disable-line scss/no-duplicate-dollar-variables */
+    $not-output: $not-output + ':not(#{$not})'; // stylelint-disable-line scss/no-duplicate-dollar-variables
   }
 
   &#{$not-output} {