Worked on the cloudflare/partykit repository to address a stability issue by making the PartyServer fetch handler asynchronous and ensuring it properly awaited the routePartykitRequest call. This change resolved problems encountered during Vitest integration testing and brought the implementation in line with the documented usage example. Updated the README to reflect the new async behavior, which improved developer onboarding and reduced discrepancies between code and documentation. Demonstrated proficiency in JavaScript, TypeScript, and Node.js, with a focus on asynchronous programming patterns and testing. The work enhanced test reliability, non-blocking I/O behavior, and overall maintainability of the PartyKit codebase.