Developed comprehensive TypeScript type definitions for the json-source-map package within the grafana/k6-DefinitelyTyped repository, focusing on enhancing type safety and developer experience for TypeScript users. The work included creating typings for parsing and stringifying JSON, as well as defining options and location interfaces to ensure robust type coverage. Automated tests were implemented to verify the accuracy and reliability of the typings across common usage scenarios, supporting safer integration of JSON utilities in the k6 ecosystem. This effort centered on feature delivery rather than bug fixes, leveraging skills in TypeScript, type definitions, and npm package maintenance to improve code quality.