old_contents: var path = require('path');
  var webpack = require('webpack');
  var HtmlWebpackPlugin = require('html-webpack-plugin');
  var paths = require('../helpers/paths');
  var env = require('../helpers/env');
  var HappyPack = require('happypack');
  var babelConfig = require('../helpers/babelConfig');
  var globals = require('../helpers/globals');
  
  module.exports = function styles (webpackConfig) {
    webpackConfig.plugins.push(
      new webpack.DefinePlugin(globals),
      new HtmlWebpackPlugin({
        template: path.resolve(paths.srcPath, 'index.html'),
        hash: false,
        filename: 'index.html',
        inject: 'body',
        favicon: path.resolve(paths.srcPath, 'static/favicon.ico'),
        minify: {
          collapseWhitespace: true
        }
      })
    )
  
    var preprocess =
  
    webpackConfig.plugins.push(
      new HappyPack({
        id: 'scripts',
        threads: 4,
        loaders: [
          'babel?' + JSON.stringify(babelConfig)
        ]
      })
    )
  
    if (env.isDevelopment) {
      webpackConfig.plugins.push(
        new webpack.HotModuleReplacementPlugin(),
        new webpack.NoErrorsPlugin()
      )
    } else if (env.isProduction) {
      webpackConfig.plugins.push(
        new webpack.optimize.OccurrenceOrderPlugin(),
        new webpack.optimize.DedupePlugin(),
        new webpack.optimize.UglifyJsPlugin({
          compress: {
            unused: true,
            dead_code: true,
            warnings: false
          }
        })
      )
    }
  
    if (!env.isTest) {
      webpackConfig.plugins.push(new webpack.optimize.CommonsChunkPlugin({
        names: ['vendors']
      }))
    }
  
    return webpackConfig;
  }
  
new_contents: var path = require('path');
  var webpack = require('webpack');
  var HtmlWebpackPlugin = require('html-webpack-plugin');
  var paths = require('../helpers/paths');
  var env = require('../helpers/env');
  var HappyPack = require('happypack');
  var babelConfig = require('../helpers/babelConfig');
  var globals = require('../helpers/globals');
  
  module.exports = function styles (webpackConfig) {
    webpackConfig.plugins.push(
      new webpack.DefinePlugin(globals),
      new HtmlWebpackPlugin({
        template: path.resolve(paths.srcPath, 'index.html'),
        hash: false,
        filename: 'index.html',
        inject: 'body',
        favicon: path.resolve(paths.srcPath, 'static/favicon.ico'),
        minify: {
          collapseWhitespace: true
        }
      })
    )
  
    var preprocess =
  
    webpackConfig.plugins.push(
      new HappyPack({
        id: 'scripts',
        threads: 4,
        loaders: [
          'babel?' + JSON.stringify(babelConfig)
        ],
        cache: !env.isProduction
      })
    )
  
    if (env.isDevelopment) {
      webpackConfig.plugins.push(
        new webpack.HotModuleReplacementPlugin(),
        new webpack.NoErrorsPlugin()
      )
    } else if (env.isProduction) {
      webpackConfig.plugins.push(
        new webpack.optimize.OccurrenceOrderPlugin(),
        new webpack.optimize.DedupePlugin(),
        new webpack.optimize.UglifyJsPlugin({
          compress: {
            unused: true,
            dead_code: true,
            warnings: false
          }
        })
      )
    }
  
    if (!env.isTest) {
      webpackConfig.plugins.push(new webpack.optimize.CommonsChunkPlugin({
        names: ['vendors']
      }))
    }
  
    return webpackConfig;
  }
  
subject: disable cache on production builds