Babel preset example from http://survivejs.com/webpack_react/webpack_and_react/#defining-your-own-babel-presets

index.js

module.exports = {
  // You can also include other presets
  presets: ['es2015'],
  plugins: [
    require('babel-plugin-syntax-class-properties'),
    require('babel-plugin-syntax-decorators'),
    require('babel-plugin-syntax-object-rest-spread'),

    // You can pass parameters using an array syntax
    [
      require('babel-plugin-transform-regenerator'),
      {
        async: false,
        asyncGenerators: false
      }
    ]
  ]
};