webpack.prod.js

const path = require('path');
const webpack = require('webpack');
const HtmlWebPackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
const TerserPlugin = require('terser-webpack-plugin');
const WorkboxPlugin = require('workbox-webpack-plugin');
const CopyPlugin = require('copy-webpack-plugin');

module.exports = {
    entry: './src/client/index.js',
    output: {
        libraryTarget: 'var',
        library: 'Client'
    },
    mode: 'production',
    optimization: {
        minimizer: [
            new TerserPlugin({}), 
            new OptimizeCSSAssetsPlugin({})],
    },
    module: {
        rules: [
            {
                test: '/\.js$/',
                exclude: /node_modules/,
                loader: 'babel_loader'
            },
            {
                test: /\.scss$/,
                use: [ MiniCssExtractPlugin.loader, 'css-loader', 'sass-loader' ]
            }
        ]
    },
    plugins: [
        new HtmlWebPackPlugin ({
        template: './src/client/views/index.html',
        filename: './index.html'
        }),
        new MiniCssExtractPlugin({
            filename: '[name].css'
        }),
        new WorkboxPlugin.GenerateSW(),
        new CopyPlugin([
            { from: './src/client/img', to: './img' },
        ])
    ]
}