Worked on the biomejs/biome repository to refine linting behavior for TypeScript, specifically targeting the noUnusedVariables rule in ambient contexts. Addressed the issue of false positives by updating the rule to ignore type parameters declared within ambient TypeScript constructs, such as declare module blocks. This adjustment reduced unnecessary lint warnings, improving both developer experience and CI reliability. The solution was implemented using Rust and TypeScript, with comprehensive tests added to cover ambient-context scenarios and prevent future regressions. The work demonstrated a focused approach to code quality, emphasizing targeted improvements and robust test coverage within the project’s linting infrastructure.