一定不要运行npm i XXX -g(-d) 一定要指定版本，尽量低版本，也不最新版本，会导致不兼容和指令不一样的问题。
1.安装webpack-dev-server 报错，说需要webpack-cli，原因，这两个之中某一个版本太高。，重新安装低版本
2.安装webpack-cli ，然后还是不能使用，
3. npm WARN webpack-cli@3.0.8 requires a peer of webpack@^4.x.x but none is installed. You must install peer dependencies yourself.。。说明安装的Webpack版本太高，切换到，---》》》》》》》》》"webpack": "^3.6.0",
4.最后安装 "webpack-cli": "^3.0.0",
5.安装"webpack-dev-server": "^2.9.1"
报错总结：
【1】
npm WARN webpack-cli@3.0.8 requires a peer of webpack@^4.x.x but none is installed. You must install peer dependencies yourself.
【2】
npm WARN webpack-dev-middleware@3.1.3 requires a peer of webpack@^4.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN webpack-dev-server@3.1.4 requires a peer of webpack@^4.0.0-beta.1 but none is installed. You must install peer dependencies yourself.
【3】
C:\Apache24\htdocs\example\Aproject\test\first-day\Vue-study\02-day\web-pack
> webpack-dev-server
The CLI moved into a separate package: webpack-cli.
Please install 'webpack-cli' in addition to webpack itself to use the CLI.
-> When using npm: npm install webpack-cli -D
-> When using yarn: yarn add webpack-cli -D
---------------------
作者：不正经的前端程序员
来源：CSDN
原文：https://blog.csdn.net/qq_27300101/article/details/80932670?utm_source=copy
版权声明：本文为博主原创文章，转载请附上博文链接！