webpack.config.js

const HtmlWebpackPlugin = require('html-webpack-plugin');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const webpack = require('webpack');
const path = require('path');

module.exports = {
    entry: './index.js',
    output: {
        path: path.resolve(__dirname, 'dist'),
        filename: 'bundle.js'
    },
    devtool: 'inline-source-map',
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /(node_modules)/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['es2015', 'react']
                    }
                }
            }
        ]
    },
    plugins: [
        new webpack.HotModuleReplacementPlugin(),
        new webpack.optimize.UglifyJsPlugin({
            sourceMap: true
        }),
        new webpack.DefinePlugin({
            'process.env.NODE_ENV': JSON.stringify('development')
        }),
        new HtmlWebpackPlugin({
            template: './index.html'
        })
    ]
};