
TypeScript 6.0
The last TypeScript release built on JavaScript
What it does
TypeScript 6.0 is the last release built on JavaScript — and the bridge to TypeScript 7.0, which is being rewritten in Go for native speed and parallel type-checking. This release modernizes defaults (strict mode on, ESM-first, ES2025 target), adds built-in Temporal API types, Map.getOrInsert, and RegExp.escape, and deprecates legacy patterns that won't survive the native port. If you write TypeScript, the migration window to the native era starts now.
Does the same job
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- TITypical is TypeScript with type-safety at runtimeJan 2026 · typical.elliots.dev · ▲8
Spent a week in the break building a pre-compiler that brings type safety to runtime. Still pretty early, but generally does what it says. Looking for feedback, code that breaks it (check out the playground), ideas etc.

- STScala-ts – Scala to TypeScript compiler2016 · github.com · ▲66
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