webpack.config.js

// For node to know our absolute file path we will be using the internal module path
const path = require("path");
const CompressionPlugin = require('compression-webpack-plugin');

// Our export here is the configuration webpack will use
module.exports = {
  // [mode] will determine how our code will be bundled.
  // "development" will be human readable
  // "production" will be minified
  mode: "development",
  // [entry] this is the file where the bundling starts from.
  entry: "./src/index.jsx",
  // [output] is a configuration object to determine how and where to bundle our code
  output: {
    // [path] is where to output
    path: path.join(__dirname, "public"),
    // [filename] is the name of the file
    filename: "bundle.js",
  },
  module: {
    // [rules] will determine the rules around those external modules
    rules: [
      // First rule is to idenify js and jsx files and turn on babel
      {
        test: /\.(jsx|js)$/,
        exclude: [/node_modules/, /config.js/],
        loader: "babel-loader"
      },
      // Second rule is to check for css files and load them with the following loaders
      {
        test: /\.css$/,
        use: ["style-loader", "css-loader"],
      },
    ],
  },
  // [devtool] this is an additional source map that will let the browser know what files are running our code.
  // Helps with error tracing. Without it we will not know where our errors are coming from because it will state that everything inside the bundle file.
  devtool: "eval-cheap-module-source-map",
  // [devServer] configuration for the live server including port
  devServer: {
    // [static] config for how what to serve
    static: {
      directory: path.join(__dirname, "public"),
    },
    compress: true,
    // [port] what port on our local machine to run the dev server
    port: 3000,
  },

  plugins: [
    new CompressionPlugin({
      filename: "[path][base].gz",
      algorithm: "gzip",
      test: /\.js$|\.css$|\.html$/,
      threshold: 10240,
      minRatio: 0.8,
      compressionOptions: { level : 9 }
    })
  ]
};