Webpack+React production config

webpack.config.js

let {resolve} = require('path');
let webpack = require('webpack');

module.exports = {
    entry: resolve('index.js'),
    output: {
        path: resolve('dist'),
        filename: 'bundle.js'
    },
    plugins: [
        new webpack.DefinePlugin({
            'process.env': {
                'NODE_ENV': JSON.stringify('production')
            }
        })
    ]
}