TypeScript 7.0: The Go Rewrite Lands — What It Means for Your Projects
· 7 min read
TypeScript 7.0 shipped on July 8, 2026. The compiler is now written in Go — a line-by-line port of the existing TypeScript codebase (codename "Corsa"), not a from-scratch rewrite. The result is 8–12x faster builds, dramatically faster editor responsiveness, and a language server that crashes far less often. This is the single biggest performance improvement in TypeScript's 12-year history. But it comes with real breaking changes, a missing programmatic API, and a migration path that rewards patience over haste.