webpack.config.js

var path = require('path');
module.exports = {
  entry: './src/index.js',
  output: {
    path: path.resolve(__dirname, 'build'),
    filename: 'index.js',
    libraryTarget: 'commonjs2'
  },
  module: {
    loaders: [
      {
        test: /\.jsx?$/,
        include: path.resolve(__dirname, 'src'),
        exclude: /(node_modules|bower_components|build)/,
        loader: 'babel-loader'
      },
      {
          test: /\.scss$/,
          loaders: ['style-loader', 'css-loader', 'sass-loader']
      },
      {
        test: /\.(jpg|png|gif)$/,
        loader: 'url-loader',
        options: {
          limit: 25000,
        },
      },
    ],
  },
  externals: {
    'react': 'commonjs react' // this line is just to use the React dependency of our parent-testing-project instead of using our own React.
  }
};