Worked on the getsentry/sentry-javascript repository to enhance error handling in the React SDK by introducing an explicit 'handled' prop to the ErrorBoundary component. This feature, implemented using JavaScript and TypeScript, allows developers to mark errors as handled directly, replacing the previous implicit behavior tied to the 'fallback' prop. The approach improves reliability and observability by enabling clearer error categorization and reducing the risk of silent failures. Focused on frontend development and robust error handling, the work provided clear traceability through a dedicated commit, supporting reproducibility and efficient code review for teams integrating the updated error management functionality.