@morsedigital/webpack-defaults/src/utils/uglifier_settings.js

module.exports = {
  compress: {
    warnings: false
    , screw_ie8: true
    , unused: true
    , dead_code: true
  }
  , output: {
    comments: false
  }
  , sourceMap: false
  , mangle: true
  , minimize: true
};