> Yeah, and if Facebook DOES infringe on a patent you own, and it's a valid case? You then have to rewrite your frontend code base as fast as you can?

In that case, you have two other options:

* Quietly swap out your frontend before you file

* Continue using React and dare Facebook to produce a patent they can actually claim

This, of course, is based on the assumption that your frontend is a significant portion of your product. If your frontend is a trivial portion, then "rewrite your frontend code base as fast as you can" is also trivial.

Edit: fixed formatting