TypeScript & Node: What's New

TypeScript and Node ship fast — TypeScript roughly quarterly, Node every six months — and a coding model's training data lags both. This skill is a terse, source-verified recency index: what actually shipped, what version it landed in, and whether it's stable or still preview. It is not a tutorial and not a house style guide — if the project you're working in has its own coding-standards skill (canonical types, architecture, lint/tsconfig rules), that skill is authoritative for doctrine; this one only answers "does X exist yet, and can I use it here."

Facts here were verified against official sources (devblogs.microsoft.com/typescript, nodejs.org/api, github.com/microsoft/TypeScript, github.com/microsoft/typescript-go, github.com/nodejs/node) as of 2026-06-30, including empirical checks against real installed typescript@6.0.3 and several Node binaries — not from memory. Items marked NEEDS RE-VERIFICATION had no definitive official source at write time; confirm before relying on them. Treat references/tsgo-native-compiler.md as the most likely to be stale by the time you read it — that project ships weekly.