webpack 打包报错：

One CLI for webpack must be installed. These are recommended choices, delivered as separate packages:

解决办法：

全局、局部安装个遍！具体什么原因还不清楚...

先全局安装webpack和webpack-cli
npm install webpack -g
npm install webpack-cli -g
再局部安装webpack和webpack-cli
npm install webpack --save-dev
npm install webpack-cli --save-dev