webpack.config.prod.js

const { merge } = require('webpack-merge');
const common = require('./webpack.config.common.js');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const path = require('path');

module.exports = merge(common, {
    mode: "production",
    // Enable sourcemaps for debugging webpack's output.
    devtool: "source-map",
    devServer: {
        contentBase: path.join(__dirname, 'dist'),
        compress: true,
        port: 9000
    },
    module: {
        rules: [
            {
                test: /\.s?(a|c)ss$/,
                use: [
                    MiniCssExtractPlugin.loader,
                    'css-loader',
                    {
                        loader: 'sass-loader',
                        options: {
                            sourceMap: false
                        }
                    }
                ]
            }
        ]
    },

    plugins: [
        new MiniCssExtractPlugin({
            filename: '[name].[hash].css',
            chunkFilename: '[id].[hash].css',
        }),
    ],
});