webpack.prod.js

const path = require('path');
const common = require('./webpack.common');
const merge = require('webpack-merge');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const OptimizeCssAssetsPlugin = require('optimize-css-assets-webpack-plugin');
const TerserPlugin = require('terser-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');


module.exports = merge(common, {
    output: {
        filename: "[name].[contentHash].js",
        path: path.resolve(__dirname, "dist"),
    },
    // build files are uglified 
    mode: "production",
    optimization: {
        minimizer: [
            new OptimizeCssAssetsPlugin(),
            new TerserPlugin(),
            new HtmlWebpackPlugin({
                template: "./public/index.html",
                minify: {
                    removeAttributeQuotes: true,
                    collapseWhitespace: true,
                    removeComments: true,
                }
            })
        ],
    },
    plugins: [
        new MiniCssExtractPlugin({
            filename: "[name].[contentHash].css",
        }),
        new CleanWebpackPlugin(),
    ],
    module: {
        rules: [
            {
                test: /\.scss$/,
                // Order matters
                use: [
                    MiniCssExtractPlugin.loader,// 3. Extract css to files
                    "css-loader",  // 2. css -> js
                    "sass-loader", // 1. scss -> css
                ]
            },
        ]
    }
});