During March 2025, Anran developed UI Translation Compliance Tooling for the formatjs/formatjs repository by implementing a custom ESLint rule that detects literal strings in object properties such as 'label'. This rule enforces translation requirements, helping teams identify and address untranslated UI text early in the development process. Anran’s approach included writing automated tests and comprehensive documentation to support adoption and correct usage. The work leveraged JavaScript, TypeScript, and ESLint, with a focus on maintainable testing practices. While the contribution was focused on a single feature, it addressed a nuanced localization challenge and improved the reliability of UI internationalization workflows.