javascript
export default 42;

javascript
System.register([], function (_export, _context) {
  return {
    setters: [],
    execute: function () {
      _export("default", 42);
    }
  };
});

sh
npm install --save-dev babel-plugin-transform-es2015-modules-systemjs

javascript
// without options
{
  "plugins": ["transform-es2015-modules-systemjs"]
}

// with options
{
  "plugins": [
    ["transform-es2015-modules-systemjs", {
      // outputs SystemJS.register(...)
      "systemGlobal": "SystemJS"
    }]
  ]
}

sh
babel --plugins transform-es2015-modules-systemjs script.js

javascript
require("babel-core").transform("code", {
  plugins: ["transform-es2015-modules-systemjs"]
});