webpack.config.js

var path = require('path')
var ExtractTextPlugin = require ('extract-text-webpack-plugin');
module.exports = {
  entry: './src/client.js',
  output: {
    path: path.resolve(__dirname, 'public'),
    filename: 'bundle.js'
  },
  module: {
    rules:[
      {
          test: /\.js$/,
          exclude: /node_modules/,
          loader: 'babel-loader'
      },
      {
        test: /\.css$/,
        loader: ExtractTextPlugin.extract({ fallback: 'style-loader', use: [ 'css-loader' ] })
      },
      {
        test: /\.(gif|png|jpe?g|svg)$/i,
        use: [
          'file-loader',
          {
            loader: 'image-webpack-loader',
            options: {
              bypassOnDebug: true, // webpack@1.x
              disable: true, // webpack@2.x and newer
            },
          },
        ],
      }
    ]
  },
  plugins: [
      new ExtractTextPlugin('bundle.css')
  ],
  resolve: {
    extensions: ['.webpack.js','.web.js', '.js', '.json']
  }
};