text: 
  var gulp = require('gulp');
  var sass = require('gulp-sass');
  var rename = require('gulp-rename');
  var cleanCSS = require('gulp-clean-css');
  var autoprefixer = require('gulp-autoprefixer');
  var del = require('del');
  var header = require('gulp-header');
  var pkg = require('./package.json');
  
  var banner = ['/*!',
      ' * <%= pkg.name %> <%= pkg.version %> (http://javatmp.com)',
      ' * <%= pkg.description %>',
      ' *',
      ' * @link <%= pkg.homepage %>',
      ' * @copyright 2018 JavaTMP',
      ' * @license <%= pkg.license %>',
      ' */',
      ''].join('\n');
  
  gulp.task('delete-css', function (cb) {
      return del.sync(['./dist/**/*'], cb());
  });
  
  gulp.task('sass', gulp.series("delete-css", function (cb) {
      return gulp.src([
          './src/bootstrap-foundation.scss',
          './src/bootstrap-reverse.scss',
          './src/bootstrap-ltr-extender.scss',
          './src/bootstrap-extender.scss'
      ])
              .pipe(sass().on('error', sass.logError))
              .pipe(autoprefixer({
                  browsers: ['last 2 versions'],
                  cascade: false
              }))
              .pipe(header(banner, {pkg: pkg}))
              .pipe(cleanCSS())
              .pipe(rename({suffix: '.min'}))
              .pipe(gulp.dest('./dist/'));
  }));
  
  gulp.task('default', gulp.series("sass", function (cb) {
      // place code for your default task here
      cb();
  }));
  