minimal mocha + babel setup to show import/export working

.babelrc

{
  "presets": ["env"]
}

README.md

1. npm i babel-core babel-preset-env; npm i -g mocha
2. add .babelrc and two .js files to current dir
3. run mocha --require babel-core/register foo.js

bar.js

export default 'foo';

foo.js

import foo from './bar';