Worked on the DefinitelyTyped/DefinitelyTyped repository to deliver an upgrade of type definitions for the eslint-plugin-security package, focusing on improving type safety and maintaining compatibility with the latest ESLint features. The approach centered on updating TypeScript type definitions to address evolving linting requirements, ensuring downstream consumers benefit from enhanced reliability and reduced runtime risk in their configurations. The work was implemented through a single pull request, reflecting a targeted and efficient contribution. Leveraging skills in linting, type definitions, and TypeScript, the developer prioritized maintainability and alignment with upstream changes, supporting the broader TypeScript ecosystem’s need for robust, up-to-date type support.