webpack.config.js

const path = require('path');
const ReactRefreshWebpackPlugin = require('@pmmmwh/react-refresh-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const { WebpackManifestPlugin } = require('webpack-manifest-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const Dotenv = require('dotenv-webpack');

let mode = 'development';

const plugins = [
  new Dotenv({
    path: './.env.local',
  }),
  new CleanWebpackPlugin(),
  new MiniCssExtractPlugin({ filename: './static/css/main.css' }),
  new HtmlWebpackPlugin({
    template: './public/index.html',
    favicon: './public/favicon.ico',
  }),
  new WebpackManifestPlugin({
    basePath: './public',
    fileName: 'manifest.json'
})
];

if (process.env.NODE_ENV === 'production') {
  mode = 'production';
}

if (process.env.SERVE) {
  plugins.push(new ReactRefreshWebpackPlugin());
}

module.exports = {
  // mode defaults to 'production' if not set
  mode: mode,

  entry: './src/index.js',

  output: {
    publicPath: "/", //Without publicPath resources might not be loaded properly /article/uuid, only index.html.
    filename: './static/js/[name].bundle.js',
    // output path is required for `clean-webpack-plugin`
    path: path.resolve(__dirname, 'dist'),
    // this places all images processed in an image folder
    assetModuleFilename: './static/media/[hash][ext][query]',
  },

  module: {
    rules: [
      {
        test: /\.(png|jpe?g|gif)$/i,
        /**
         * The `type` setting replaces the need for "url-loader"
         * and "file-loader" in Webpack 5.
         *
         * setting `type` to "asset" will automatically pick between
         * outputing images to a file, or inlining them in the bundle as base64
         * with a default max inline size of 8kb
         */
        type: 'asset', // 'asset/resource' 'asset/inline'

        /**
         * If you want to inline larger images, you can set
         * a custom `maxSize` for inline like so:
         */
        // parser: {
        //   dataUrlCondition: {
        //     maxSize: 30 * 1024,
        //   },
        // },
      },
      {
        test: /\.svg$/i,
        type: 'asset',
        resourceQuery: /url/, // *.svg?url https://react-svgr.com/docs/webpack/
      },
      {
        test: /\.svg$/i,
        issuer: /\.[jt]sx?$/,
        resourceQuery: { not: [/url/] }, // exclude react component if *.svg?url
        use: ['@svgr/webpack'],
      },
      {
        test: /\.(s[ac]|c)ss$/i,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
            // This is required for asset imports in CSS, such as url()
            options: { publicPath: '../../' },
            // publicPath is the relative path of the resource to the context
            // e.g. for ./css/admin/main.css the publicPath will be ../../
            // while for ./css/main.css the publicPath will be ../
          },
          'css-loader',
          'postcss-loader',
          // according to the docs, sass-loader should be at the bottom, which
          // loads it first to avoid prefixes in your sourcemaps and other issues.
          'sass-loader',
        ],
      },
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        use: {
          // without additional settings, this will reference .babelrc
          loader: 'babel-loader',
          options: {
            /**
             * From the docs: When set, the given directory will be used
             * to cache the results of the loader. Future webpack builds
             * will attempt to read from the cache to avoid needing to run
             * the potentially expensive Babel recompilation process on each run.
             */
            cacheDirectory: true,
          },
        },
      },
    ],
  },

  plugins: plugins,

  devtool: 'source-map',

  resolve: {
    extensions: ['.js', '.jsx'],
  },

  devServer: {
    static: {
      directory: path.join(__dirname, 'dist'),
    },
    hot: true,
    historyApiFallback: true, // for routes on single page app
  },
};