webpack.config.js

// node
const path = require('path');
const fs = require('fs');

// npm
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const CopyPlugin = require('copy-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const FixStyleOnlyEntriesPlugin = require('webpack-fix-style-only-entries');

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

module.exports = {
  mode: 'development',
  entry: {
    main: './src/index.js',
    styles: ['./public/styles.scss'],
  },
  devtool: 'source-map',
  output: {
    filename: '[name].js',
    path: path.resolve(__dirname, 'dist'),
  },

  plugins: [
    new CleanWebpackPlugin(),
    new webpack.ProgressPlugin(),
    new HtmlWebpackPlugin({
      filename: 'index.html',
      template: './public/index.html',
    }),
    ...fs.readdirSync('./public/pages').map(
      (file) => new HtmlWebpackPlugin({
        filename: file,
        template: `./public/pages/${file}`,
      }),
    ),
    new FixStyleOnlyEntriesPlugin(),
    new MiniCssExtractPlugin({
      // Options similar to the same options in webpackOptions.output
      // both options are optional
      filename: devMode ? '[name].css' : '[name].[hash].css',
      chunkFilename: devMode ? '[id].css' : '[id].[hash].css',
    }),
  ],

  module: {
    rules: [
      {
        test: /\.(sa|sc|c)ss$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
            options: {
              hmr: process.env.NODE_ENV === 'development',
              reloadAll: true,
            },
          },
          'css-loader',
          'sass-loader',
        ],
      },
      {
        // Now we apply rule for images
        test: /\.(png|jpe?g|gif|svg)$/,
        loader: 'file-loader',
        options: {
          name: '[path][name].[ext]',
          context: 'public',
        },
      },
      {
        test: /\.(woff|woff2|eot|ttf|otf)$/,
        loader: 'file-loader',
        options: {
          name: '[path][name].[ext]',
          context: 'public',
        },
      },
      {
        test: /.(js|jsx)$/,
        include: [path.resolve(__dirname, 'src')],
        loader: 'babel-loader',

        options: {
          plugins: ['syntax-dynamic-import'],

          presets: [
            [
              '@babel/preset-env',
              {
                modules: false,
              },
            ],
          ],
        },
      },
    ],
  },

  optimization: {
    splitChunks: {
      cacheGroups: {
        vendors: {
          priority: -10,
          test: /[\\/]node_modules[\\/]/,
        },
      },

      chunks: 'async',
      minChunks: 1,
      minSize: 30000,
      name: true,
    },
  },

  devServer: {
    open: true,
    disableHostCheck: true,
    headers: {
      'Access-Control-Allow-Origin': '*',
      'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, PATCH, OPTIONS',
      'Access-Control-Allow-Headers':
        'X-Requested-With, content-type, Authorization',
    },
  },
};