Worked on the mozilla/rhino repository to deliver support for rest parameters in destructuring assignments, expanding JavaScript syntax compatibility within the engine. The implementation involved updates to the code generator, interpreter, and parser, ensuring that remaining properties could be collected into new objects or arrays during destructuring. Leveraging skills in compiler design and Java, the work included refactoring core runtime logic to streamline rest-property handling and reduce maintenance complexity. Comprehensive unit testing was conducted, with expanded coverage to validate the new feature and address edge cases. These enhancements improved reliability and developer productivity for downstream applications using the Rhino engine.