During July 2025, Cheng focused on improving the correctness of code generation in the denoland/typescript-go repository. He addressed a specific issue with JSDoc comment emission at the end of generated JavaScript files, ensuring that documentation is consistently preserved during the build process. Cheng implemented a targeted bug fix and supplemented it with automated tests to validate the end-of-file JSDoc behavior, using TypeScript and JavaScript for both the fix and the test suite. While no new features were introduced, his work enhanced the stability and reliability of the codebase, laying a solid foundation for future development and downstream tooling.