And most of that came from Flux to begin with (as seen in https://facebook.github.io/react/blog/2014/07/30/flux-action... ). There's also a lot of interesting parallels with the Win32 WndProc functions, as discussed in https://bitquabit.com/post/the-more-things-change/ and https://bitquabit.com/post/the-more-things-change/ .

That said, you are absolutely encouraged to abstract over that process as much as you want! For example, the https://github.com/acdlite/redux-actions library will generate both the action constants and the action creators for you, and there's many more similar utilities.