Worked on the reduxjs/redux-toolkit repository to enhance type safety for TypeScript users by addressing a type export issue. Delivered a focused fix that re-exported the WritableDraft type from the Immer library, ensuring that consumers of the toolkit have consistent and correct typings available. This adjustment was implemented as a minimal, low-risk change at the type definition level, preserving API compatibility while improving the developer experience. The work involved careful library integration and a strong understanding of TypeScript’s type system, resulting in a seamless update that maintained stability and consistency across the toolkit’s type exports without introducing new features.