Rohan Arora enhanced the hiero-ledger/hiero-sdk-js repository by implementing string input support and validation for the PendingAirdropId class. He enabled senderId, receiverId, tokenId, and nftId to accept string inputs, introducing type conversion and robust validation to ensure data integrity. His approach enforced mutual exclusivity between tokenId and nftId, reducing potential runtime errors and improving integration reliability. Rohan updated unit tests to comprehensively cover the new functionality, leveraging JavaScript and object-oriented programming principles. This work focused on improving developer experience and minimizing integration friction, demonstrating a thoughtful application of unit testing and validation techniques within a JavaScript codebase.