webpack.config.dist.js

const webpack = require('webpack');
const { resolve } = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const UglifyJSPlugin = require('uglifyjs-webpack-plugin');

module.exports = {
    context: resolve(__dirname, 'src'),
    devtool: 'cheap-module-source-map',

    entry: {
        app: [
            'whatwg-fetch',
            './index.js'
        ],
        vendor: [
            'react',
            'react-dom',
            'react-router-dom',
            'react-transition-group'
        ]
    },

    module: {
        rules: [
            {
                test: /\.js?$/,
                use: [
                    {
                        loader: 'babel-loader',
                        options: {
                            babelrc: false,
                            presets: [
                                ['env', { modules: false }],
                                'react',
                                'stage-0'
                            ],
                            plugins: [
                                'react-hot-loader/patch',
                                'transform-decorators-legacy'
                            ]
                        }
                    }
                ],
                exclude: /node_modules/
            },
            {
                test: /\.css|scss$/,
                use: [
                    'style-loader',
                    'css-loader',
                    {
                        loader: 'postcss-loader',
                        options: {
                            sourceMap: true
                        }
                    },
                    'resolve-url-loader',
                    'sass-loader?sourceMap'
                ]
            },
            {
                test: /\.(jpe?g|png|gif|svg)$/i,
                use: [
                    'file-loader?hash=sha512&digest=hex&name=assets/[hash].[ext]',
                    {
                        loader: 'image-webpack-loader',
                        options: {
                            mozjpeg: {
                                progressive: true
                            },
                            gifsicle: {
                                interlaced: false
                            },
                            optipng: {
                                optimizationLevel: 4
                            },
                            pngquant: {
                                quality: '75-90',
                                speed: 4
                            }
                        }
                    }
                ]
            }
        ]
    },

    plugins: [
        new webpack.NoEmitOnErrorsPlugin(),
        new HtmlWebpackPlugin({
            template: 'index.html'
        }),
        new webpack.optimize.CommonsChunkPlugin({
            name: 'vendor'
        }),
        new UglifyJSPlugin({
            sourceMap: true,
            beautify: false,
            mangle: {
                screw_ie8: true,
                keep_fnames: true
            },
            compress: {
                screw_ie8: true
            },
            comments: false
        }),
        new webpack.DefinePlugin({
            'process.env.NODE_ENV': JSON.stringify('production')
        })
    ],

    output: {
        filename: 'assets/[name].[chunkhash].js',
        path: resolve(__dirname, 'dist'),
        publicPath: `/`
    }
};