webpack.production.config.js

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

const UglifyJsPlugin = webpack.optimize.UglifyJsPlugin;
const CopyWebpackPlugin = require('copy-webpack-plugin');

module.exports = {
  devtool: 'cheap-source-map',
  entry: [
    path.resolve(__dirname, 'app/main.jsx'),
  ],
  output: {
    path: `${__dirname}/build`,
    publicPath: '/',
    filename: './bundle.js'
  },
  module: {
    loaders: [
      {
        test: /\.css$/,
        loader: 'style-loader!css-loader'
      },
      {
        test: /\.scss$/,
        loaders: ['style', 'css', 'sass']
      },
      {
        test: /\.js[x]?$/,
        include: path.resolve(__dirname, 'app'),
        exclude: /node_modules/,
        loader: 'babel-loader'
      },
      {
        test: /\.(eot|woff|woff2|ttf|svg|png|jpe?g|gif)(\?\S*)?$/,
        loader: 'url?limit=100000@name=[name][ext]'
      }
    ]
  },
  resolve: {
    extensions: ['', '.js', '.jsx'],
  },
  plugins: [
    new webpack.optimize.DedupePlugin(),
    new UglifyJsPlugin({
      compress: {
        warnings: false
      }
    }),
    new CopyWebpackPlugin([
      { from: './app/index.html', to: 'index.html' },
      { from: './app/main.css', to: 'main.css' }
    ]),
  ]
};