Complex animated transitions in React

Very nice. I enjoyed using d3 before all the Angular and React stuff came along. With this I can now "idiomatically" do d3 stuff in React.

I really wanted to live in the alternative world where d3 was extended to cover more react-like use cases, rather than the other way around.

Interesting. How many kb's will be added to your bundle, including dependencies?

How are you handling animations here?