liberama/build/webpack.prod.config.js

const path = require('path');
//const webpack = require('webpack');

const merge = require('webpack-merge');
const baseWpConfig = require('./webpack.base.config');
const TerserPlugin = require('terser-webpack-plugin');
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');

const publicDir = path.resolve(__dirname, '../dist/tmp/public');
const clientDir = path.resolve(__dirname, '../client');

module.exports = merge(baseWpConfig, {
    mode: 'production',
    output: {
        path: `${publicDir}/app_new`,
        filename: 'bundle.[contenthash].js'
    },
    module: {
        rules: [
            {
                test: /\.css$/,
                use: [
                  MiniCssExtractPlugin.loader,
                  'css-loader'
                ]
            }
        ]
    },
    optimization: {
        minimizer: [
            new TerserPlugin(),
            new OptimizeCSSAssetsPlugin()
        ]
    },
    plugins: [
        new CleanWebpackPlugin([publicDir], {root: path.resolve(__dirname, '..')}),
        new MiniCssExtractPlugin({
            filename: "[name].[contenthash].css"
        }),
        new HtmlWebpackPlugin({
            template: `${clientDir}/index.html.template`,
            filename: `${publicDir}/index.html`
        }),
        new CopyWebpackPlugin([{from: `${clientDir}/assets/*`, to: `${publicDir}/`, flatten: true}])
    ]
});