Anuj Chhajed contributed to the prettier/angular-html-parser repository by delivering a targeted bug fix and refactor focused on improving code correctness and maintainability. He addressed an issue with undefined checks for NgDevMode, updating all instances of typeof ngDevMode !== undefined to the correct JavaScript pattern typeof ngDevMode !== 'undefined'. This change enhanced runtime safety and aligned the codebase with Angular conventions, reducing the risk of unintended behavior. Working primarily with TypeScript and Angular, Anuj demonstrated careful attention to detail in core parsing logic, ensuring that future maintenance and code reviews would be more straightforward and consistent across the project.