TypeScript 7.0 RC: the compiler is now written in Go. ~10x faster than 6.0 via native code and parallelism. Parallel parsing, type-checking (--checkers, default 4 workers), and emit. --watch rebuilt on a Go port of Parcel's file-watcher. Type-checking semantics identical to 6.0. npm install -D typescript@rc. microsoft/typescript-go, 25.7k stars.