Worked on enhancing type safety for prefetch queries in the TanStack/query repository, focusing on aligning with React Query’s typing model to reduce potential misuse. Developed and delivered a feature that introduced UsePrefetchQueryOptions, which excludes skipToken from the prefetch query function, thereby preventing invalid usage scenarios. The implementation included comprehensive type-checking tests to enforce compile-time safety, ensuring that errors related to skipToken are caught early in the development process. Utilized TypeScript and React Query, with an emphasis on robust testing and type safety practices. The work addressed a specific type error and improved the reliability of prefetch query handling.