During June 2025, Eran contributed to the firebase/firebase-js-sdk repository by delivering modular typings generation tailored for google3 environments. He implemented Rollup configuration and integrated rollup-plugin-dts within the analytics and remote-config packages, enabling the automated creation of global_index.d.ts files. This approach allowed internal google3 builds to consume modular TypeScript typings, reducing cross-package typing friction and improving type safety. By leveraging build tools, module systems, and TypeScript, Eran established a standardized process for internal typings distribution. His work laid the foundation for broader modular typings adoption across the SDK, addressing internal build challenges and enhancing maintainability for future development.