old_contents: var webpack = require('webpack');
  var path = require('path');
  var ManifestPlugin = require('webpack-manifest-plugin');
  var ChunkManifestPlugin = require('chunk-manifest-webpack-plugin');
  const Visualizer = require('webpack-visualizer-plugin');
  
  var __DEV__ = process.env.NODE_ENV !== 'production';
  
  module.exports = {
    entry: {
      bundle: './client'
    },
    devtool: __DEV__ ? 'inline-source-map' : null,
    node: {
      // Mock Node.js modules that Babel require()s but that we don't
      // particularly care about.
      fs: 'empty',
      module: 'empty',
      net: 'empty'
    },
    output: {
      filename: __DEV__ ? '[name].js' : '[name]-[hash].js',
      chunkFilename: __DEV__ ?
        '[name].js' :
        '[name]-[chunkhash].js',
      path: path.join(__dirname, '/public/js'),
      publicPath: '/js'
    },
    resolve: {
      alias: {
        'dist/rx.all.js': 'rx/dist/rx.all.js'
      }
    },
    module: {
      rules: [{
        test: /\.jsx?$/,
        include: [
          path.join(__dirname, 'client/'),
          path.join(__dirname, 'common/'),
          path.join(__dirname, 'server/')
        ],
        use: [
          __DEV__ && 'react-hot-loader',
          'babel-loader'
        ].filter(Boolean)
      }]
    },
    externals: {
      codemirror: 'CodeMirror',
      'loop-protect': 'loopProtect'
    },
    plugins: [
      new webpack.DefinePlugin({
        'process.env': {
          NODE_ENV: JSON.stringify(__DEV__ ? 'development' : 'production')
        },
        __DEVTOOLS__: !__DEV__
      }),
      // Use browser version of visionmedia-debug
      new webpack.NormalModuleReplacementPlugin(
        /debug\/node/,
        'debug/src/browser'
      )
    ]
  };
  
  if (!__DEV__) {
    module.exports.plugins.push(
      new ManifestPlugin({ fileName: 'react-manifest.json' }),
      new ChunkManifestPlugin({
        filename: 'chunk-manifest.json',
        manifestVariable: 'webpackManifest'
      })
    );
  } else {
    module.exports.plugins.push(
      new webpack.HotModuleReplacementPlugin(),
      new webpack.NoErrorsPlugin(),
      // this will output a .html file in output.path
      new Visualizer({ filename: 'webpack-bundle-stats.html' })
    );
  }
  
new_contents: var webpack = require('webpack');
  var path = require('path');
  var ManifestPlugin = require('webpack-manifest-plugin');
  var ChunkManifestPlugin = require('chunk-manifest-webpack-plugin');
  const Visualizer = require('webpack-visualizer-plugin');
  
  var __DEV__ = process.env.NODE_ENV !== 'production';
  
  module.exports = {
    entry: {
      bundle: './client'
    },
    devtool: __DEV__ ? 'inline-source-map' : null,
    node: {
      // Mock Node.js modules that Babel require()s but that we don't
      // particularly care about.
      fs: 'empty',
      module: 'empty',
      net: 'empty'
    },
    output: {
      filename: __DEV__ ? '[name].js' : '[name]-[hash].js',
      chunkFilename: __DEV__ ?
        '[name].js' :
        '[name]-[chunkhash].js',
      path: path.join(__dirname, '/public/js'),
      publicPath: '/js'
    },
    resolve: {
      alias: {
        'dist/rx.all.js': 'rx/dist/rx.all.js'
      }
    },
    module: {
      rules: [{
        test: /\.jsx?$/,
        include: [
          path.join(__dirname, 'client/'),
          path.join(__dirname, 'common/'),
          path.join(__dirname, 'server/')
        ],
        use: [
          __DEV__ && 'react-hot-loader',
          'babel-loader'
        ].filter(Boolean)
      }]
    },
    externals: {
      codemirror: 'CodeMirror',
      'loop-protect': 'loopProtect'
    },
    plugins: [
      new webpack.DefinePlugin({
        'process.env': {
          NODE_ENV: JSON.stringify(__DEV__ ? 'development' : 'production')
        },
        __DEVTOOLS__: !__DEV__
      }),
      // Use browser version of visionmedia-debug
      new webpack.NormalModuleReplacementPlugin(
        /debug\/node/,
        'debug/src/browser'
      )
    ]
  };
  
  if (!__DEV__) {
    module.exports.plugins.push(
      new ManifestPlugin({ fileName: 'react-manifest.json' }),
      new ChunkManifestPlugin({
        filename: 'chunk-manifest.json',
        manifestVariable: 'webpackManifest'
      })
    );
  } else {
    module.exports.plugins.push(
      new webpack.HotModuleReplacementPlugin(),
      new webpack.NoEmitOnErrorsPlugin(),
      // this will output a .html file in output.path
      new Visualizer({ filename: 'webpack-bundle-stats.html' })
    );
  }
  
subject: Update to errors plugin name