Microsoft's Go-Based TypeScript Compiler Delivers Up to 10x Speed Gains in TypeScript 7

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Microsoft has ported the TypeScript compiler from TypeScript to Go under Project Corsa, delivering performance improvements of roughly 5x to 12x depending on project size, hardware, and workload. The decision followed extensive evaluation of multiple languages and architectures, including hybrid approaches that would keep only performance-critical parts in native code. Go was chosen primarily for compatibility reasons, as both the existing and new compilers need to coexist and share fixes during a transition period. The team also studied native tools like swc, oxc, and esbuild before concluding that a full native port would yield the greatest long-term benefits. TypeScript 7 is expected to bring these gains to developers, though the team cautions that real-world results will vary and some caveats remain before upgrading large codebases.

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