gulpfile.js

var gulp = require('gulp'),
  $ = require('gulp-load-plugins')()

gulp.task('default', ['skin-minify', 'copy-vendor'])

gulp.task('skin-minify', function () {
  return gulp.src(['assets/ckeditor/skins/xe-minimalist/src/*.css', '!**/_*.css'])
    .pipe($.cleanCss({compatibility: 'ie9', inline: ['local']}))
    .pipe(gulp.dest('assets/ckeditor/skins/xe-minimalist'))
})

gulp.task('assets:common', function () {
  return gulp.src(['assets/css/src/*.scss', '!**/_*.scss'])
    .pipe($.sass({
      outputStyle: 'compressed'
    }))
    .pipe(gulp.dest('assets/css'))
})

gulp.task('watch', function () {
  gulp.watch('**/*.scss', ['assets:common'])
})

gulp.task('copy-vendor', function () {
  return gulp.src([
    './node_modules/cropper/dist/cropper.min.js',
    './node_modules/cropper/dist/cropper.min.css'
  ])
    .pipe(gulp.dest('components/EditorTools/ImageResizeTool/assets/vendor/cropper'))
})