我有一个config.js文件：

const serviceModule = {
  AxiosConfig:{
    baseURL: 'http://10.10.10.105:8001/',

    withCredentials: true,
    headers: {

      "Content-Type": "application/json;charset=utf-8"

    }
  }
}



let ApiSetting = {...serviceModule };

export default ApiSetting

但是在npm run dev的时候会报错：

ERROR in ./src/api/config.js
Module build failed: SyntaxError: Unexpected token (28:18)

  26 | 
  27 | 
> 28 | let ApiSetting = {...serviceModule };
     |                   ^
  29 | 
  30 | export default ApiSetting
  31 | 

 @ ./src/api/http.js 6:0-34
 @ ./src/main.js
 @ multi (webpack)-dev-server/client?http://localhost:8080 webpack/hot/dev-server ./src/main

请问这是哪里的问题呢？