Ricardo Basto focused on stabilizing real-time data handling in the supabase/supabase-js repository by addressing a critical bug in the convertChangeData function. He improved the robustness of the TypeScript codebase by ensuring that null 'record' inputs are safely managed, returning an empty object to prevent runtime exceptions in real-time streams. Ricardo expanded automated test coverage to verify this null input handling, enhancing regression protection and overall reliability. His work centered on API development and real-time data processing, with careful attention to testing and CI stability. These targeted improvements reduced the risk of crashes and improved the user experience for real-time applications.