接手了別人的項目，在配置 devServer 時直接照搬了之前的配置結(jié)果報錯

 ValidationError: Invalid options object. Dev Server has been initialized using an options object that does not match the API schema.
         - options has an unknown property 'disableHostCheck'. 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? }

 ValidationError: Invalid options object. Dev Server has been initialized using an options object that does not match the API schema.

這段報錯信息意思是Dev Server已使用與API模式不匹配的選項對象初始化，其中明確指出是屬性 ‘disableHostCheck’，于是我屏蔽了這個屬性，發(fā)現(xiàn)能啟動成功

此時我查看了之前和這次的項目的webpack的版本發(fā)現(xiàn)這次的版本是 webpack5 之前是webpack4，并且查看了webpack的文檔發(fā)現(xiàn)

‘disableHostCheck’ 這個屬性在webpack4中已經(jīng)被刪除替換，webpack5中已經(jīng)不存在這個屬性了，所以配置這個會報錯，正確做法是替換成

devServer: {
    historyApiFallback: true,
    allowedHosts: "all"
  },

OK！

附：options has an unknown property 'overlay'.解決

解決方法：

module.exports={
  devServer:{
    //...
    hot: true,
    port: devPort,
    open: true,
    client: {
      overlay: {
        warnings: true,
        errors: true,
      },
    },
  }
}

總結(jié)

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