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ES Modules: import, export & Tooling
Named vs default exports, dynamic import(), npm packages, and modern bundlers
ES Modules (ESM) are the official ECMA standard for modular JavaScript code organization, featuring static analysis, tree-shaking, and asynchronous dynamic loading.
Named vs Default Exports
Named Exports (export const add = ...): Export multiple functions or values per module. Imported with curly braces: import { add } from "./math.js";.
Default Export (export default App): Exactly one default export per file. Imported without braces: import App from "./App.js";.
Dynamic import("./module.js"): Returns a Promise resolving to the module, enabling route-based code splitting and on-demand lazy loading in web apps.
// Button click triggers dynamic code chunk download
document.getElementById("exportBtn").addEventListener("click", async () => {
// Only downloads pdfGenerator.js when user actually clicks the button!
const { generatePDF } = await import("./utils/pdfGenerator.js");
generatePDF({ title: "Codexia Report", timestamp: Date.now() });
});Set your Publisher ID in src/config/ads.ts to display live ads.
Test Yourself With Exercise
Which syntax enables code-splitting and on-demand lazy loading of JavaScript modules?