npm更新包

Error: Cannot find module 'webpack-cli/bin/config-yargs

解决来源：https://blog.csdn.net/longzhoufeng/article/details/81026467

Webpack与webpack-dev-server版本不兼容导致

//卸载版本

cnpm uninstall webpack -g

cnpm uninstall -g webpack-dev-server

//安装指定版本

cnpm install webpack@3.8.0 --save-dev

cnpm install webpack-dev-server@2.9.7 --save-dev