webpack-uglify.js

new webpack.optimize.UglifyJsPlugin({
  mangle: true,
  unused: true,
  dead_code: true, // big one--strip code that will never execute
  warnings: false, // good for prod apps so users can't peek behind curtain
  drop_debugger: true,
  conditionals: true,
  evaluate: true,
  drop_console: true, // strips console statements
  sequences: true,
  booleans: true,
  compress: {
    warnings: false, // Suppress uglification warnings
    pure_getters: true,
    unsafe: true,
    unsafe_comps: true,
    screw_ie8: true
  },
  output: {
    comments: false,
  },
}),