[Feature Request] Provide action$ steam like dependencies while using createEpicMiddleware

[parav01d]

Connect the action$ steam over sockets with the backend

Proof of Concept

In one of my applications, I tried to send the Redux action$ stream directly to the backend via a socket. The responses from the backend are in turn written directly back into the stream as an action. To trigger the dispatch function of redux I wrote an epic for success and failure actions which merge the actions directly to the action$ steam again. ( to trigger dispatch ).

Problem

To minimalize the boilerplate I wanted to reduce the amount of code using an backend$ steam combined with an action$ steam as input for react-observable. So I created a websocket connection to the backend with rxjs/webSocket and wanted to use it as an action$ steam. But there is no way to change the action$ steam. I changed the createEpicMiddleware options in my project to provide an action$ steam property like dependencies on creation.

Improvement

Please provide action$ property like dependencies while creating createEpicMiddleware to make it more flexible while working with steams.

Example

While spending more or less time with my family on Christmas I created this proof of concept which shows the problem.