webpack.config.js

/*
    ./webpack.config.js
*/
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const webpack = require("webpack");
const HtmlWebpackPluginConfig = new HtmlWebpackPlugin({
  template: './client/index.html',
  filename: 'index.html',
  inject: 'body'
});
module.exports = {
    devtool: "cheap-module-source-map",
    entry: './client/index.js',
  output: {
    path: path.resolve('dist'),
    filename: 'index_bundle.js'
  },
  module: {
    loaders: [
      { test: /\.js$/, loader: 'babel-loader', exclude: /node_modules/ },
      { test: /\.jsx$/, loader: 'babel-loader', exclude: /node_modules/ }
    ]
  },
plugins : [HtmlWebpackPluginConfig,
    new webpack.DefinePlugin({
        'process.env': {
            'NODE_ENV': JSON.stringify('production')
        }
    })
]
};