During November 2025, contributed a static analysis enhancement to the oxc-project/tsgolint repository by implementing a prefer-includes rule that detects indexOf(...) !== -1 and /regex/.test() patterns, recommending migration to includes for improved code clarity. The solution leveraged TypeScript and ESLint, utilizing type-checking to ensure rule applicability and reduce false positives. Regex processing and typescript-eslint utilities were integrated to robustly evaluate patterns and handle common edge cases. Comprehensive testing, including formatting, linting, end-to-end, and Go tests, validated the changes and ensured regression safety. This work modernized code patterns and enhanced maintainability without introducing new bugs during the release period.