webpack5 webpack-dev-server 版本兼容

参考地址：https://www.cnblogs.com/zdz8207/p/vue-webpack-dev-server.html

　　　　　https://blog.csdn.net/qq_40557812/article/details/115220537?utm_medium=distribute.pc_relevant.none-task-blog-2~default~baidujs_title~default-1.no_search_link&spm=1001.2101.3001.4242

版本：

直接安装webpack-dev-server 对应的最新版本为@4.3.1，npm run dev时会报错：

node_modules\_webpack-dev-server@4.3.1@webpack-dev-serverlibserversWebsocketServer.js:10
  static heartbeatInterval = 1000;
                           ^

SyntaxError: Unexpected token =
    at new Script (vm.js:83:7)
    at NativeCompileCache._moduleCompile

　　

网上搜索了，说是版本兼容问题，所以尝试降低webpack-dev-server版本为@2.9.1

（1）、npm uninstall webpack-dev-server
（2）、npm install webpack-dev-server@2.9.1
（3）、npm run dev

结果还是报错：（版本过低）

[webpack-cli] You need to install 'webpack-dev-server' for running 'webpack serve'.       
Error: Cannot find module 'webpack-dev-server/bin/cli-flags'

参考文档将版本升为@3.11.2，结果完美解决

package.json文件

  "scripts": {
    "dev": "webpack serve --progress --config ./webpack.config.js"
  },