webpackJsonp ist nicht definiert: webpack-dev-server und CommonsChunkPlugin

Dies ist mein webpack.config.js Datei:

const webpack = require('webpack');
const path = require('path');

module.exports = {
  cache: true,
  devtool: 'source-map',
  entry: {
    app : [
      './src/index.js'
    ],
    vendor: ['lodash']
  },
  output: {
    filename: 'bundle.js',
    path: path.join(__dirname, 'dist'),
    publicPath: '/dist/',
    pathinfo: true
  },
  module: {
    loaders: [
      { test: /\.js$/, exclude: /node_modules/, loaders: ['babel'] },
      { test: /\.scss/, exclude: /node_modules/, loaders: ['style', 'css', 'sass'] }
    ]
  },
  plugins: [
    new webpack.NoErrorsPlugin(),
    new webpack.optimize.CommonsChunkPlugin('vendor', 'vendor.bundle.js', Infinity)
  ]
};

- Und dies ist meine Skripte, läuft das webpack-dev-server:

const webpack =require('webpack');
const WebpackDevServer = require('webpack-dev-server');
const webpackConfig = require('../webpack.config');
const _  = require('lodash');

const webpackDevConfig = _.cloneDeep(webpackConfig);
const devPort = 3000;

webpackDevConfig.entry.app.unshift('webpack/hot/dev-server');
webpackDevConfig.entry.app.unshift('webpack-dev-server/client?http://localhost:' + devPort + '/');
webpackDevConfig.plugins.push(new webpack.HotModuleReplacementPlugin());

new WebpackDevServer(webpack(webpackDevConfig), {
  publicPath: webpackConfig.output.publicPath,
  hot: true,
  stats: {
    colors: true,
    chunks: false
  }
}).listen(devPort, 'localhost');

Den webpack Ausgabe des Befehls ist gut (bundle.js und vendor.bundle.js), aber der dev-server wird nicht mit webpackJsonp is not defined (obwohl seine in-memory-Zusammenstellung gelungen).

Beim entfernen CommonsChunkPlugin aus webpack.config.js - es funktioniert alles einwandfrei:

...
entry: [
    './src/index.js'
  ],
...
plugins: [
    new webpack.NoErrorsPlugin()
  ]

Irgendwelche Ideen?