传送门

https://github.com/dlmanning/gulp-sass

npm 安装列表

$ cnpm install --save-dev gulp-clean

gulpfile.js

'use strict';
const gulp = require('gulp');
let cleanCSS = require('gulp-clean-css');

gulp.task('mincss', () => {
  return gulp.src('./dist/assets/css/*.css')
    .pipe(cleanCSS({compatibility: 'ie8'}))
    .pipe(gulp.dest('./dist/assets/css/'));
});

执行gulp任务

$ gulp mincss