Worked on the facebook/flow repository to enhance type safety for browser-driven service worker notifications by introducing explicit type definitions for the ServiceWorkerRegistration API, specifically targeting getNotifications and showNotification methods. Leveraging TypeScript and JavaScript skills, the work aligned Flow’s type system with the WHATWG Notifications API specification, reducing potential runtime errors in notification handling. This addition improved developer confidence and productivity by enabling safer integration of notifications within Flow-based projects. The changes contributed to a more robust service worker infrastructure, ensuring that notification-related code paths are more reliable and maintainable for teams building on the Flow platform.