Worked on enhancing type safety for Backbone.js event handling in the grafana/k6-DefinitelyTyped repository by updating the TypeScript definitions in DefinitelyTyped. Focused on improving the off and stopListening methods to support object-based event maps, aligning the typings with real-world Backbone usage and reducing the risk of incorrect event removal. The technical approach involved refining API definitions and leveraging TypeScript’s type system to ensure more reliable event handling. This update improved maintainability and correctness for projects depending on @types/backbone, providing downstream developers with safer, more flexible event listener management while maintaining compatibility with existing Backbone.js application patterns.