Ali Mousa developed a Vue data-declaration lint rule for the biomejs/biome repository, targeting best practices in Vue 3+ component design. The rule enforces function-based data declarations to prevent shared mutable state, addressing a common source of runtime bugs. Ali implemented an automatic fix that converts object data declarations into functions returning the data object, streamlining code consistency and maintainability. The work was carried out under analyze/js, leveraging JavaScript, TypeScript, and static code analysis techniques. This contribution focused on code quality and onboarding efficiency, demonstrating depth in ESLint rule development and automated code repair within a modern JavaScript tooling ecosystem.