I'm not really sure, I haven't followed the development that closely... I know I tried it... and it was pretty close... when I was ready to switch, had done some testing, and had to adjust several of the defaults to be closer to the existing linter config. That said, the reformat/lint-fix was so fast, it wasn't that big a deal. Did it in two commits, one with just the linter config, another with the reformats in a separate commit.

The whole project can be scanned and reformatted and lint-fixes applied in under a second... the eslint config with TS took several seconds... as a precommit hook it felt pretty painful in practice, now you don't even notice it.

If they do as well for build options (once added), I'll be very happy indeed.