Yash Srivastava extended type safety for browser-driven service worker notifications in the facebook/flow repository by introducing explicit type definitions for the ServiceWorkerRegistration API, specifically targeting getNotifications and showNotification methods. Using TypeScript and JavaScript, Yash aligned Flow’s type system with the WHATWG Notifications API specification, reducing potential runtime errors in notification handling code paths. This work improved the reliability and maintainability of service worker-based features in Flow projects, enabling safer integration of notifications. The deliverable enhanced developer productivity and confidence by ensuring more robust type checking, contributing to a stronger service worker infrastructure within the Flow codebase during the month.