You don't actually have to do this if it bothers you. You can just use the strings inline, but the author (and many of those using Redux) finds it helps to reduce errors, by instantly pointing out typos.

There are also patterns to reduce the import issue. For example, https://github.com/erikras/ducks-modular-redux. I prefer defining my actions with my action creators in one big index, but the point is that there is absolutely a way to mitigate this concern if it bothers you :)