Andrey Viktorovov modernized the activeadmin/activeadmin repository by migrating plugin.js from CommonJS to ECMAScript Modules, aligning the codebase with the package.json module type. This transition involved converting require statements to import syntax and updating module.exports to export default, leveraging JavaScript’s ESM features for cleaner imports and improved tree-shaking. The work focused on long-term maintainability, reducing technical debt and easing future refactoring efforts. Andrey utilized JavaScript and Tailwind CSS throughout the process, ensuring compatibility with modern tooling. While no bugs were addressed during this period, the depth of the migration lays a solid foundation for future development and stability.