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Re:React v16.3.0: New lifecycles and context API by danabramov on Thursday March 29, 2018 @10:42PM (#16713271)
I believe it's in the blog post:

https://reactjs.org/blog/2018/03/27/update-on-async-renderin...

(TLDR: Use `componentDidUpdate` for this.)

Have you had a chance to skim through it?

Re:React v16.3.0: New lifecycles and context API by myth_drannon on Monday April 02, 2018 @09:59AM (#16734500)
Yes, I also saw your post on twitter. I will try to use it from now on. Thanks!