Contributed to the nodejs/node repository by enhancing type definitions for core interfaces, focusing on ConfigBinding, HTTPParser, and Worker. The work involved refining TypeScript typings to strengthen type safety and improve developer ergonomics, addressing inconsistencies and adding missing properties and methods. Through a series of targeted commits, the developer ensured that type contracts were more robust, reducing the risk of typing-related regressions and facilitating smoother integration for downstream projects. Collaboration with maintainers during code reviews helped align the changes with Node.js contribution standards. The effort demonstrated proficiency in TypeScript, Node.js, and interface design, delivering measurable improvements to core API contracts.