webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const webpack = require('webpack');
const ExtractTextPlugin = require('extract-text-webpack-plugin');

const config = {
  entry: ['babel-polyfill', './app/index.js'],
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'index_bundle.js',
    publicPath: '/',
  },
  module: {
    rules: [
      { test: /\.(js)$/, exclude: /node_modules/, use: 'babel-loader' },
      {
        test: /\.css$/,
        use: ExtractTextPlugin.extract({
          use: [
            {
              loader: 'css-loader',
              options: { importLoaders: 1 },
            },
            'postcss-loader',
          ],
        }),
      },
      { test: /\.(png|jpg|svg|gif)$/, use: 'url-loader' },
    ],
  },
  plugins: [
    new ExtractTextPlugin('index.css'),
    new HtmlWebpackPlugin({
      template: 'app/index.html',
    }),
  ],
  devServer: {
    historyApiFallback: true,
  },
};

if (process.env.NODE_ENV === 'production') {
  config.plugins.push(
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: JSON.stringify(process.env.NODE_ENV),
      },
    }),
    new webpack.optimize.UglifyJsPlugin(),
  );
}


module.exports = config;