webpack.config.js

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

const devMode = process.env.NODE_ENV !== 'production';

module.exports = {
    context: path.resolve(__dirname, 'src'),
    mode: 'development',
    entry: './index.js',
    output: {
        filename: devMode ? '[name].js' : '[name].[hash].js',
        path: path.resolve(__dirname, 'dist'),
    },
    resolve: {
        extensions: ['.js', '.css', '.sass', '.gif', '.svg', '.png']
    },
    optimization: {
        splitChunks: {
            chunks: 'all'
        },
        minimize: true,
        minimizer: [
            new OptimizeCssAssetsPlugin(),
            new TerserPlugin()
        ],
    },
    plugins: [
        new CleanWebpackPlugin(),
        new HtmlWebpackPlugin({
            template: './index.html',
            favicon: './img/favicon.svg',
            minify: {
                collapseWhitespace: true
            },
        }),
        new MiniCssExtractPlugin({
            filename: devMode ? '[name].css' : '[name].[hash].css',
            chunkFilename: devMode ? '[id].css' : '[id].[hash].css',
        })
    ],
    module: {
        rules: [
            {
                test: /\.m?js$/,
                exclude: /(node_modules|bower_components)/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['@babel/preset-env']
                    }
                }
            },
            {
                test: /\.svg$/,
                loader: 'svg-inline-loader',
            },
            {
                test: /\.css$/i,
                use: [MiniCssExtractPlugin.loader, 'css-loader'],
            },
            {
                test: /\.s[ac]ss$/i,
                use: [MiniCssExtractPlugin.loader, 'css-loader', 'sass-loader'],
            },
            {
                test: /\.(png|jpg|gif)$/,
                use: ['file-loader'],
            },
        ],
    },
    devServer: {
        contentBase: path.join(__dirname, 'dist'),
        compress: true,
        port: 9000
    }
};