parcel.js

const Bundler = require("parcel-bundler");
const Path = require("path");

// Entrypoint file location
const server = Path.join(__dirname, "app.js");

// Bundler options
const serverOpt = {
  outDir: "./", // The out directory to put the build files in, defaults to dist
  outFile: "handler.js", // The name of the outputFile
  publicUrl: "./", // The url to server on, defaults to dist
  watch: true,
  cacheDir: ".cache", // The directory cache gets put in, defaults to .cache
  minify: false, // Minify files, enabled if process.env.NODE_ENV === 'production'
  target: "node", // browser/node/electron, defaults to browser
  logLevel: 3, // 3 = log everything, 2 = log warnings & errors, 1 = log errors
  sourceMaps: true, // Enable or disable sourcemaps, defaults to enabled (not supported in minified builds yet)
  detailedReport: true // Prints a detailed report of the bundles, assets, filesizes and times, defaults to false, reports are only printed if watch is disabled
};

// Entrypoint file location
const browser = Path.join(__dirname, "./src/index.js");

// Bundler options
const browserOpt = {
  outDir: "./Browser",
  outFile: "bundle.js",
  publicUrl: "./",
  watch: true,
  cacheDir: ".cache",
  minify: false,
  target: "browser",
  https: false,
  logLevel: 3,
  hmrPort: 0,
  sourceMaps: true,
  hmrHostname: "",
  detailedReport: false
};

const bundler = new Bundler(server, serverOpt);
const bundle = bundler.bundle();

// Initialises a bundler using the entrypoint location and options provided
const bundlers = new Bundler(browser, browserOpt);

// Run the bundler, this returns the main bundle
// Use the events if you're using watch mode as this promise will only trigger once and not for every rebuild
const bundle1 = bundlers.bundle();

// Run the bundler, this returns the main bundle
// Use the events if you're using watch mode as this promise will only trigger once and not for every rebuild