webpack.config.prod.js

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

module.exports = {
  entry: './src/main.jsx',
  output: {
    path: __dirname,
    filename: 'bundle.js'
  },
  resolve: {
    extensions: ['', '.js', '.jsx']
  },
  node: {
    fs: "empty"
  },
  module: {
    loaders: [
      {
        test: /\.(js|jsx)$/,
        loader: ['babel-loader'],
        exclude: /node_modules/,
        query: {
          presets: ['es2015', 'react']
        }
      },
      {
        test: /\.scss$/,
        loaders: ['style-loader', 'css-loader', 'sass-loader']
      },
      {
        test: /\.css$/,
        loaders: ['style-loader', 'css-loader']
      }, {
        test: /\.(jpg|png)$/,
        loader: 'url-loader'
      }, {
        test: /\.json$/,
        loader: 'json-loader'
      }
    ]
  },
  plugins: [
    new webpack.DefinePlugin({
    "process.env": { 
        NODE_ENV: JSON.stringify("production") 
      }
    }),
    new webpack.optimize.UglifyJsPlugin({
      compress: {
        warnings: false,
      },
    }),
    new webpack.optimize.OccurenceOrderPlugin(),
    new webpack.optimize.DedupePlugin(),
  ],
}