I spent $4,000 to make TypeScript faster

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A developer invested $4,000 to investigate and fix TypeScript performance issues in large codebases using TRPC. The investigation led to discovering caching problems in TypeScript's type instantiation process, resulting in a significant performance improvement that was merged into TypeScript 5.9 beta. The fix reduces type instantiation counts by up to 78% and halves compilation times for complex type inference scenarios common in tools like TRPC and Zod.

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