Off topic but Dan - referring to your question to me yesterday I'm curious to your answer:

You asked "Curious, what do you use it for?" in regard to componentWillReceiveProps

https://news.ycombinator.com/item?id=16695064

I use componentWillReceiveProps for just about everything - I had thought it was a fundamental part of the Redux flow. i.e. Redux updates, new props flow through the hierarchy, I pick that up in componentWillReceiveProps and make changes based on new props.

Is this not correct?