Are you really just opposed to doing things in different files? I'm going to divert the conversation away from Redux entirely if that's the case. You should in

Are you really just opposed to doing things in different files? I'm going to divert the conversation away from Redux entirely if that's the case. You should invest in an editor with good "go to definition" support. I had a similar problem, but as soon as I did this, the pain threshold for switching files dropped to nearly 0. (If that's not the case, do keep on mind that a file separation is totally unnecessary. You could write your state manipulators inline if you wanted. I feel it is a bit organizationally messy, but hey, whatever you like.)