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');
var clean = require('gulp-clean');

gulp.task('clean', function () {
    return gulp.src('./dist/**', {read: false})
        .pipe(clean());
});

执行gulp任务

$ gulp clean

执行之后，dist文件夹就被清空并删除了