text: const webpack = require('webpack');
  const OptimizeJsPlugin = require('optimize-js-plugin');
  
  const defaultConfig = require('./webpack.config');
  
  module.exports = Object.assign({}, defaultConfig, {
    devtool: undefined,
  
    mode: 'production',
  
    output: Object.assign({}, defaultConfig.output, {
      filename: 'is.min.js'
    }),
  
    plugins: defaultConfig.plugins.concat([
      new webpack.LoaderOptionsPlugin({
        debug: false,
        minimize: true
      }),
      new webpack.optimize.OccurrenceOrderPlugin(),
      new OptimizeJsPlugin({
        sourceMap: false
      })
    ])
  });
  