cnpm install rimraf -g
package.json 可以像下面这样配置， 这样 每次build时候 都会把原来build好的 全部删除 重新编译
{ "name": "webpack-ensure", "version": "1.0.0", "description": "", "main": "index.js", "scripts": { "test": "echo \"Error: no test specified\" && exit 1", "build": "rimraf dist && webpack" }, "author": "", "license": "ISC", "devDependencies": { "html-webpack-plugin": "^2.25.0", "webpack": "^1.14.0" } }
rimraf --A deep deletion module for node (like `rm -rf`)
原文：http://www.cnblogs.com/WhiteHorseIsNotHorse/p/6992160.html