// stage 1
{
  loader: 'babel-loader'
  presets: [
    'es2016',
    'react',
    [
      'babili', { // <- options not yet supported (https://github.com/babel/babili/pull/162)
        mangle: false // this will be performed on the entire bundle.
        deadcode: false // not tested which is better for deadcode - stage1 or 3 - just an idea
      }
    ]
  ]
}

// stage 2
bundle - webpack

// stage 3
new BabiliWebpackPlugin({
  mangle: true, // <- option not yet supported
  deadcode: true, // <- option not yet supported
  [everythingelse]: false // <- just a notation
  comments: false,
});
// or 
babel.transform(bundledcode, {
  minified: true, // syntax
  compact: true,
  comments: false,
  plugins: ["mangle", "deadcode"]
})