Worked on modernizing the Transaction API within the MystenLabs/ts-sdks repository by refactoring the Transaction class to utilize ClientWithCoreApi in place of SuiClient. This update involved aligning type definitions for the getDigest client option with the latest core API structures, enhancing compatibility and reducing technical debt. The approach focused on TypeScript refactoring, SDK development, and improving code hygiene to ensure a cleaner API surface for downstream clients. By emphasizing typing improvements and commit-driven delivery, the work positioned the SDK for future changes and made ongoing maintenance more straightforward, while also improving typing safety and overall developer experience.