Node.js 26

Apply these conventions when targeting Node.js 26.x (Current line, LTS in October 2026). V8 14.6 / Chromium 146 baseline, NODE_MODULE_VERSION = 147.

For TypeScript projects, use TypeScript 7. It is the default compiler for new Node.js 26 projects and documents compatibility constraints for API-dependent tooling.

Runtime Baseline

• V8 14.6.202.33 (from Chromium 146). All V8 14.x ECMAScript additions are available without flags.
• Undici 8.0.2 powers fetch, Request, Response, Headers, WebSocket.
• ICU 78.3, libuv 1.52.1, bundled SQLite 3.53.x (with Percentile extension), npm 11.x.