message: * Disabled production JS minimization
diff: import webpack from 'webpack'
  import ExtractTextPlugin from 'extract-text-webpack-plugin'
  -import UglifyJsPlugin from 'uglifyjs-webpack-plugin'
  +// import UglifyJsPlugin from 'uglifyjs-webpack-plugin'
  import config from 'app-config'
  @@ -31,8 +31,10 @@ export default (webpackConfig) => {
  })
  webpackConfig.plugins.push(
  - new UglifyJsPlugin({
  - }),
  + // Perhaps it's the cause of errors during the swap process,
  + // so temporary commented.
  + // new UglifyJsPlugin({
  + // }),
  new ExtractTextPlugin({
  filename: '[name].[hash:6].css',
  allChunks: true,
  