Yes
copilot and codex are helping a lot by first writing tests for the old code, and then converting to the new
CrzyLngPwd on Hacker News
In the thread “The solution might be cancelling my AI subscription”, replying to this comment
Helped: Writing tests for old code before converting to new.
… Now I am excited again. I work on a large web project with lots of legacy that is slowly being rewritten and copilot and codex are helping a lot by first writing tests for the old code, and then converting to the new. I thought we'd never finish, but now I can see how we can do it. …