Morten Barklund updated the Biome Linter in the biomejs/biome repository to support React 19.2, focusing on enhancing linting capabilities for modern React code while maintaining backward compatibility. He implemented support for new hooks and APIs using JavaScript, ensuring that existing linting rules continued to function as expected. Collaborating closely with Naoki Ikeguchi and Emanuele Stoppa, Morten co-authored and validated the changes through a cross-functional review process. This work reduced upgrade risks for client projects and facilitated smoother adoption of React 19.2. The project demonstrated depth in JavaScript development, React integration, and attention to robust linting practices.