Worked on the InjectiveLabs/injective-ts repository to enhance batch promise handling by implementing per-item error reporting in the awaitForAll utility. Introduced an optional onError callback, allowing errors from individual promises to be surfaced and handled transparently, which prevents silent failures and improves reliability. Ensured backward compatibility so existing code paths remain unaffected when onError is not used. Developed targeted tests in JavaScript and TypeScript to validate all-success scenarios, per-item failure reporting, and argument correctness. Additionally, improved the readability and consistency of the test suite by standardizing import order, demonstrating attention to maintainability and robust front end development practices.