Worked on the upstash/workflow-js repository to enhance the event-wait API by introducing type-safe generics for eventData in WaitStepResponse and related classes. This update focused on improving type safety and code predictability in event-driven workflows, reducing the likelihood of runtime errors. The technical approach involved confining changes to type definitions and related instantiations within the context and types modules, thereby minimizing risk and impact on the broader codebase. Utilized TypeScript and software development best practices to deliver this feature, resulting in safer and more maintainable code for developers working with event-based systems in this repository.