Worked on modernizing the Node.js built-in module imports for the rest-api-client in the kintone/js-sdk repository. Updated import statements to use the node: prefix and removed deprecated node:module/require usage, aligning the codebase with current Node.js ESM standards. This refactoring improved compatibility with Node.js 18 and above, reduced potential runtime issues, and streamlined future maintenance. The work involved careful code review and git-based change management, ensuring standardized import patterns throughout the client library. Demonstrated proficiency in JavaScript, Node.js, and ES Module interoperability, delivering a more reliable and maintainable foundation for both users and future contributors.