Agent Skills: Node.js 23.0+ Knowledge Patch

Node.js 23.0+ Knowledge Patch

Claude's baseline knowledge covers Node.js through 22.x LTS. This patch captures post-cutoff changes from Node.js 23.0.0 (October 2024) through the 24.x line, plus later 24.x changelog additions that materially affect modern Node.js usage.

Source: Node.js releases at https://nodejs.org/en/blog/release

Quick Reference

| Area | Version | What changed | Details | |------|---------|--------------|---------| | Module loading | 23.0 | require(esm) enabled by default | Module System | | CLI | 23.0 | node --run marked stable | CLI and Testing | | Testing | 23.x-24.x | coverage globs, TS globs, env, expected failures | CLI and Testing | | Async context | 24.0 | AsyncLocalStorage defaults to AsyncContextFrame | Runtime APIs | | Web platform | 24.0 | URLPattern exposed globally | Runtime APIs | | Permissions | 24.0+ | --permission replaces --experimental-permission | Runtime APIs | | Process/runtime | 23.11+ | process.execve() and related runtime additions | Runtime APIs |

Key Pragmas

• Prefer require(esm) support and the "module-sync" export condition when publishing dual-mode packages.
• Treat URLPattern as globally available in Node.js 24+; avoid compatibility wrappers there.
• Use node --run and modern node --test capabilities before reaching for ad hoc shell wrappers.
• Write new permission-model examples with --permission, not --experimental-permission.

Example

// Node.js 24+: URLPattern is global, no import required.
const route = new URLPattern({ pathname: "/users/:id" });
const match = route.exec("https://example.com/users/42");

console.log(match.pathname.groups.id); // "42"

Reference Index

• Module System — require(esm), namespace return shape, top-level await caveat, "module-sync"
• Runtime and Web APIs — AsyncContextFrame, global URLPattern, permission model updates, process.execve(), http.setGlobalProxyFromEnv()
• CLI and Testing — stable node --run, test-runner glob/config updates, expected failures, environment injection