How to implement the writer package in version 3.0.2 on 4.0.1

How to implement the writer package in version 3.0.2 on 4.0.1

Hi! Do you mean this package in Robot Framework 3?:

https://robot-framework.readthedocs.io/en/3.0/autodoc/robot.writer.html

Not sure, but maybe this has been replaced with the rewritten parser in Robot Framework 4?: