webpack.config.js

const path = require('path');
const { WebpackManifestPlugin } = require('webpack-manifest-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

const isDev = process.env.NODE_ENV === 'development';

const baseFilename = isDev ? 'index' : 'index.[contenthash]';

module.exports = {
    mode: isDev ? 'development' : 'production',
    entry: [
        path.resolve(__dirname, 'src', 'assets', 'scripts', 'index.js'),
        path.resolve(__dirname, 'src', 'assets', 'styles', 'index.css'),
    ],
    output: {
        path: path.resolve(__dirname, 'public', 'assets'),
        filename: `${baseFilename}.js`,
    },
    module: {
        rules: [
            {
                test: /\.m?js$/,
                exclude: /(node_modules)/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['@babel/preset-env'],
                        plugins: [
                            ['@babel/plugin-proposal-class-properties'],
                            [
                                '@babel/plugin-transform-runtime',
                                { regenerator: true },
                            ],
                        ],
                    },
                },
            },
            {
                test: /\.css$/,
                use: [
                    MiniCssExtractPlugin.loader,
                    'css-loader',
                    'postcss-loader',
                ],
            },
        ],
    },
    devtool: isDev ? 'eval' : 'source-map',
    plugins: [
        new MiniCssExtractPlugin({ filename: `${baseFilename}.css` }),
        new WebpackManifestPlugin({ publicPath: '/assets/' }),
    ],
};