var gulp = require('gulp');
var CleanCSS = require('clean-css');
var map = require('vinyl-map');

gulp.task('minify-css' , function minifyCSSTask() {
  // this snippet basically replaces `gulp-minify-css`
  var minify = map(function (buff, filename) {
    return new CleanCSS({
      // specify your clean-css options here
    }).minify(buff.toString()).styles;
  });

  return gulp.src('css/**/*.css')
    .pipe(minify)
    .pipe(gulp.dest('dist'));
});