Why not do the code review with the other person and get them to explain what they are doing and why. You can cover any non-functional issues like styling, perf

Why not do the code review with the other person and get them to explain what they are doing and why. You can cover any non-functional issues like styling, performance security as you go. Surely this is the point of working in a team? If you don't really get/like React maybe you should do a small project in it?