wepack-dev-server? 未安裝

1. 執(zhí)行npm start，報(bào)上面的錯(cuò)誤信息，需要安裝webpack-dev-server，如果用到webpack-dev-server，同時(shí)也需要安裝webpack-cli，執(zhí)行命令如下：

npm install --save-dev webpack-cli

npm install --save-dev webpack-dev-server

2

2. webpack-dev-server如果是3.x的話，webpack必須是4.x才不會(huì)報(bào)此TypeError: Cannot read property 'compile' of undefined錯(cuò)誤或者Cannot match against 'undefined' or 'null'錯(cuò)誤, 同理如果webpack是3.x，則webpack-dev-server必須是2.x。

3

試著將webpack升為4.x,webpack-dev-server 為2.x。報(bào)上面的錯(cuò)誤。最終解決方案：webpack為3.x,webpack-dev-server 為2.x，執(zhí)行如下命令：

npm install --save-dev webpack-dev-server@2