Mattia Manzati upgraded the ESLint plugin within the Effect-TS/effect-smol repository, focusing on enhancing code quality and tooling reliability. By updating the @effect/eslint-plugin to its latest version, he revised import statements and refreshed the lockfile to ensure seamless integration. This JavaScript-based work centered on dependency management and ESLint configuration, enabling stricter lint rules and improved compatibility across the codebase. Although no bugs were fixed during this period, the changes laid a foundation for safer refactors and smoother CI lint runs. The effort prioritized long-term maintainability, supporting a more robust developer experience and accelerating future feature development.