webpack.config.prod.js

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

module.exports = {
  devtool: 'source-map',
  entry: {
    app: [
      'babel-polyfill',
      './src/index',
    ]
  },
  output: {
    path: path.join(__dirname, 'assets'),
    filename: '[name].js',
    publicPath: '/assets/',
  },
  module: {
    rules: [
      {
        include: path.join(__dirname, 'src'),
        test: /\.jsx?$/,
        use: [
          {loader: 'babel-loader'},
        ],
      },
      {
        test: /\.scss$/,
        use: ['style-loader', 'css-loader', 'sass-loader'],
      },
      {
        test: /\.css$/,
        use: [
          {loader: 'style-loader'},
          {loader: 'css-loader', options: {autoprefixer: true}},
        ],
      },
      {
        test: /\.png$/,
        use: [
          {loader: 'url-loader', options: {limit: 100000}}
        ],
      },
      {
        test: /\.(ttf|eot|svg|woff(2)?)(\?[a-z0-9=&.]+)?$/,
        use : ['file-loader'],
      },
    ],
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: JSON.stringify('production'),
      },
    }),
  ],
};