【webpack】 Dev Server has been initialized using an options object that does not match 报错处理

问题：

npm run start启动本地服务的时候出现 Invalid options object. Dev Server has been initialized using an options object that does not match 报错

[webpack-cli] Invalid options object. Dev Server has been initialized using an options object that does not match the API schema.
 - options has an unknown property 'contentBase'. These properties are valid:
   object { allowedHosts?, bonjour?, client?, compress?, devMiddleware?, headers?, historyApiFallback?, host?, hot?, http2?, https?, ipc?, liveReload?, magicHtml?, onAfterSetupMiddleware?, onBeforeSetupMiddleware?, onListening?, open?, port?, proxy?, server?, setupExitSignals?, setupMiddlewares?, static?, watchFiles?, webSocketServer? }

在新版本的webpack-dev-server4.0中，contentBase属性已经被移除了，变成用static替代

contentBase是webpack-dev-server3.0的用法，如果不知道如何由v3升级到v4可以看这篇官方指南

解决方法：

devServer: {
    // contentBase: "./dist", v3用法
    static:'./dist', //v4用法
}