webpack-prod.js

const common = require('./webpack-common.js');
const merge = require('webpack-merge');
const path = require('path');
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, {
	mode: 'production',
	output: {
		filename: '[name].[contentHash].bundle.js',
		path: path.resolve(__dirname, 'dist')
	},
	optimization: {
		minimizer: [new OptimizeCssAssetsPlugin(), new TerserPlugin()]
	},
	plugins: [
		new MiniCssExtractPlugin({ filename: '[name].[contentHash].css' }),
		new CleanWebpackPlugin(),
		new HtmlWebpackPlugin({
			template: './src/index.html',
			minify: {
				collapseWhitespace: true,
				removeComments: true,
				preserveLineBreaks: true
			}
		})
	],
	module: {
		rules: [
			{
				test: /\.css$/,
				use: [
					MiniCssExtractPlugin.loader, //2. extract css into files
					'css-loader' //1. turns css into common JS
				]
			}
		]
	}
});