React-router - how to use route params in onEnter?

Question

I want to do a fetch using the onEnter callback, but I don\'t know how to read a URL param in the Route component. I have this Route

Answer 1

Nevermind, it was trivial.

export function onBookLoad(nextState) {
 console.log(nextState.params.bookId);
 //do stuff with the param
}