Worked on the freckle/react-hooks repository to deliver targeted TypeScript hygiene improvements focused on internal type declaration cleanup. The approach involved replacing the 'declare type' keyword with the simpler 'type' keyword in TypeScript definition files, streamlining internal typings while minimizing changes to the public API. This update enhanced type safety and improved code readability, reducing boilerplate and lowering the risk of future refactor issues. The changes were validated through the existing build pipeline to ensure stability. By refining TypeScript definitions, the work accelerated contributor onboarding and enabled smoother integration for dependent components, supporting more efficient downstream maintenance and iteration.