In December 2024, Stanislav Morosow focused on improving runtime safety and environment detection across the supabase/supabase-js and supabase/auth-js repositories. He addressed issues in browser environment checks by updating the isBrowser logic to validate both window and document objects, preventing runtime errors in Node-like or non-browser contexts where document may exist but window is undefined. Using TypeScript and JavaScript, Stanislav delivered targeted bug fixes that aligned environment detection across both libraries, reducing production incidents and improving reliability. His work demonstrated a thoughtful approach to cross-library consistency and runtime safety, contributing to a more robust developer experience for frontend applications.