export default语法在bebel转义后会丢失作用域，代码如下

export default {

  host: 'localhost',

  port: 80

}

babel转译后

module.exports.default = {

  host: 'localhost',

  port: 80

}

解决方案

// main.js

import { foo, bar } from "./static"

// static.js

let foo =  "foo"

let bar = "bar"

export { foo, bar }