ES Modules, package.json & Exports

Understand ES Modules, package.json & Exports within Node.js 24 LTS: ESM-first modules, the event loop, built-in Fetch, the test runner, and a permission-aware runtime. Separate CPU work from asynchronous I/O.

Build a Complete Mental Model

Understand ES Modules, package.json & Exports within Node.js 24 LTS: ESM-first modules, the event loop, built-in Fetch, the test runner, and a permission-aware runtime. Separate CPU work from asynchronous I/O.

Apply It in Production Node.js

Test an original ES Modules, package.json & Exports example with concurrent requests, malformed input, timeouts, cancellation, missing configuration, dependency failure, and shutdown. Check for blocking I/O, leaked handles, and unhandled rejections.

After This Lesson

• Explain the async boundary and resource owner
• Build an example with timeout and error handling
• Test one user-visible behavior

// package.json: { "type": "module" }
import { readFile } from 'node:fs/promises';
const config = JSON.parse(await readFile(new URL('./config.json', import.meta.url), 'utf8'));
console.log(config.name);

task-api

Node.js API Documentation — Node.js