Electron Webpack Error: Uncaught ReferenceError: require is not defined

I have a very simple setup with electron and webpack. I’m trying to use the target electron-renderer but seems I cannot load electron in the app js file (electron-renderer process). I suspect it has something to do with the correct webpack config setup.

I keep getting this error: Uncaught ReferenceError: require is not defined

Lib versions:
webpack: 1.13.1
electron-prebuilt: 1.2.0

Here is my app repository: https://github.com/Cecildt/electron-webpack

Here is my webpack.config.js details:

var path = require('path');
var webpack = require('webpack');
var CommonsChunkPlugin = webpack.optimize.CommonsChunkPlugin;

module.exports = {
  devtool: 'source-map',
  debug: true,

  entry: {
    'app': './src/index.ts'
  },

  output: {
    path: __dirname + '/build/',
    publicPath: 'build/',
    filename: '[name].js',
    sourceMapFilename: '[name].js.map',
    chunkFilename: '[id].chunk.js'    
  },

  resolve: {
    extensions: ['','.ts','.js','.json', '.css', '.html'],
    modulesDirectories: ['node_modules']
  },

  module: {
    loaders: [
      {
        test: /\.ts$/,
        loader: 'ts',
        exclude: [ /node_modules/, /releases/ ]
      },
      {
        test: /\.json$/,
        loader: 'json'
      },
      {
        test: /\.(css|html)$/,
        loader: 'raw'
      },
      {
        test: /\.(png|jpg)$/,
        loader: 'url?limit=10000'
      }
    ]
  },
  plugins: [
    new webpack.ExternalsPlugin('commonjs', ['electron'])
  ],
  externals: [

  ],
  target:'electron-renderer'
};

Hope somebody can help me! Thanks in advance.