webpack.prod.js

/**
 * Production environment setup
 *
 *   Common setup
 * + Fast source mapping
 * + Dead code removal and minification
 * + External CSS
 */
const merge = require('webpack-merge');
const webpack = require('webpack');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
const common = require('./webpack.config.js');

module.exports = merge(common, {
    mode: 'production',
    devtool: "source-map",
    module: {
        rules: [
            {
                test: /\.s?[ac]ss$/,
                use: [
                    MiniCssExtractPlugin.loader,
                    'css-loader',
                    {
                        loader: 'postcss-loader',
                        options: {
                            ident: 'postcss',
                            plugins: (loader) => [
                                require('autoprefixer')(),
                                require('cssnano')()
                            ]
                        }
                    },
                    'sass-loader',
                ],
            }
        ]
    },
    plugins: [
        new MiniCssExtractPlugin({
            filename: '[name].[hash].css',
            chunkFilename: '[id].[hash].css',
        }),
        new UglifyJSPlugin({
            sourceMap: true
        }),
        new webpack.DefinePlugin({
            'process.env.NODE_ENV': JSON.stringify('production')
        })
    ]
});