How to preload routes in ReactJS?

Question

React

Tell me how to correctly preload the data before the transition to the route occurs. I wanted to write a middleware, but I don't know if there is a better solution.
To make it clearer, here is an example - https://www.lingvolive.com/ru-ru
When you visit any section, a progress bar appears at the top. Is there any guide, library for implementing this method?
Thanks in advance!