It's a port and not a rewrite. Almost a transpilation. Although surprising, Go makes sense in this context as it's the most dynamically typed language that produces native code and has a GC. Structural typing of interfaces certainly helped too.
Reposted from TypeScript
Today we're thrilled to announce our effort to port the TypeScript compiler and language service to native code, gaining a 10x speed boost in build times and editor responsiveness!

devblogs.microsoft.com/typescript/t...

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