SO-GPX-BabelWebpack

.babelrc

{
  "sourceMaps": "inline",
  "presets": ["es2015"]
}

a.js

export viewportSize from "./viewportSize";

b.js

export default function viewportSize (state = {}) {
  return state;
}

build.sh

babel a.js b.js

output.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.viewportSize = undefined;

var _viewportSize2 = require("./viewportSize");

var _viewportSize3 = _interopRequireDefault(_viewportSize2);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

exports.viewportSize = _viewportSize3.default;
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"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = viewportSize;
function viewportSize() {
  var state = arguments.length <= 0 || arguments[0] === undefined ? {} : arguments[0];

  return state;
}
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package.json

"devDependencies": {
  "babel-cli": "^6.4.5",
  "babel-core": "^6.5.1",
  "babel-preset-es2015": "^6.3.13"
},