I would recommend @acdlite's redux-actions over the methods suggested in this Gist.
The methods below can break hot-reloading and don't support Promise-based actions.
Even though 'redux-actions' still uses constants, I've come to terms with the fact that constants can be good, especially in bigger projects. You can reduce boilerplate in different places, as described in the redux docs here: http://gaearon.github.io/redux/docs/recipes/ReducingBoilerplate.html