Handler map factory should handle optimistic action type

[the-dr-lazy]

According to #2, createHandlerMap should be capable to handle optimistic action creators.

Detailed Description

Yet, optimistic actions should be handled separately with multiple createHandlerMap call. So there would be a good point to reduce boilerplates.
Although, cancel is not part of observer protocol but this type practically is important and should be handled in many cases (isFetching entity, etc.) in the reducers.

Possible Implementation

createHandlerMap(addFoo, {
  next(state, action) {},
  error(state, action) {},
  complete(state, action) {},
  cancel(state, action) {}
})

[the-dr-lazy]

Also in many cases error and cancel have shared logic.

[the-dr-lazy]

A solution for shared logic is to handle cancel and error separately:

createHandlerMap(addFoo, {
  next(state, action) {},
  complete(state, action) {},
})
createHandlerMap([addFoo.error, addFoo.cancel], (state, action) => { /* shared logic */ })

[kotarella1110]

Hey @thebrodmann again!
How do you create action creator in this case?

[the-dr-lazy]

Just by using createActionCreator in an object.

const addFoo = {
  next: createActionCreator('NEXT'),
  error: createActionCreator('ERROR'),
  cancel: createActionCreator('CANCEL'),
  complete: createActionCreator('COMPLETE'),
}