TypeScript 7.0 Ships Native Go Compiler, Up to 12x Faster

A Long-Promised Rewrite Arrives

Microsoft has released TypeScript 7.0, the culmination of a project once codenamed "Project Corsa" that rewrites the language's compiler and tooling in Go instead of TypeScript/JavaScript 1. The move marks the most consequential architectural shift in the project's history, and the release notes from Microsoft's own TypeScript team frame it as the endpoint of a multi-year effort to modernize the toolchain while keeping the language itself familiar to the millions of developers who already use it 12.

Why Developers Should Care

The headline benefit is speed. Microsoft and independent reporting both cite dramatic build and type-checking improvements, with figures ranging from roughly 8x to 12x faster depending on the codebase and source 245. Internally, Microsoft's own News Services team reportedly saved about 400 hours of engineering time per month that had previously been lost waiting on continuous-integration builds 2. External adopters saw similar gains: Vanta reported build speedups of up to 9x on one of its largest projects after moving to the new compiler 2. A separate account of Microsoft's internal testing put the improvement at roughly 10x on large codebases, underscoring that the performance jump is not a marginal tweak but a fundamental change in how quickly large TypeScript projects can be checked and compiled 5.

The Transition Path

The shift to a Go-based compiler is not happening as an abrupt cutover. TypeScript 6.0 was explicitly positioned as a "bridge release" — the last version whose compiler is written in TypeScript and JavaScript — designed to preserve existing language features while developers prepare for the Go-powered successor 5. With 7.0, Microsoft has moved the Go rewrite into its mainline release process, though nightly builds continue to be published under a separate @typescript/native-preview package with a binary named tsgo, alongside the standard typescript package that most projects depend on 8. Coverage also notes that 7.0 currently lacks a stable programmatic API, a gap Microsoft says it plans to close in a follow-up 7.1 release, and that a compatibility package is being provided to help existing tools and integrations continue functioning during the transition 4.

Staying Open Source

Despite the scale of the rewrite, TypeScript remains an open-source project hosted on GitHub, where its release history and source are publicly tracked 34. That continuity matters for an ecosystem where TypeScript underpins tooling far beyond Microsoft's own products, from build systems to editors and linters that rely on its compiler APIs. Broader developer-news aggregators tracking TypeScript activity suggest sustained community interest in the rollout, reflecting how closely the JavaScript and TypeScript ecosystems are watching the transition play out 67.

What Comes Next

With the core rewrite now shipped, attention shifts to the promised 7.1 release and its stable programmatic API, which many tooling authors are waiting on before fully committing to the native compiler 4. For now, the consensus across coverage is that TypeScript 7.0 delivers on its central promise — dramatically faster builds — while leaving some ecosystem compatibility work still in progress.