ES Modules

ES modules use export and import to share code between files with static analysis and tree-shaking support.

Example

// math.js
export const PI = 3.14;
export function add(a, b) { return a + b; }
export default class Calculator { }

// main.js
import Calculator, { PI, add } from "./math.js";
import * as Math from "./math.js";
const { PI: pi } = await import("./math.js"); // dynamic import

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Pro Tip

Dynamic import() loads modules on-demand — great for code splitting and lazy loading.

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