A little function, which could be paired with flux standard actions to help reduce redux boilerplate.

redux-observable-fsa.js

import { actionCreatorFactory } from 'typescript-fsa'
import { ajaxGetJSON, ajaxPost, ajaxPut, ajaxDelete } from 'rxjs'
import { combineEpics } from 'redux-observable'

const createEpic = (fsa, request, prepare) =>
  (action$, store) =>
    action$.ofType(fsa.started.type)
      .map(
        action => (typeof prepare === 'function' ? prepare(action, store.getState() : action.payload)
      )
      .switchMap(data => request(data)
        .map(fsa.done)
        .catch(e => [fsa.failed(e)]))

const api = {
  fetchUsers: () => ajaxGetJSON('/users'),
  createUser: (user) => ajaxPost('/users', user,  { 'content-type': 'application/json' }),
  updateUser: (user) => ajaxPut(`/users/${user.id}`, user, { 'content-type': 'application/json' }),
  deleteUser: (id) => ajaxDelete(`/users/${id}`)
}

const createAction = actionCreatorFactory()

const fetchUsers = createAction('FETCH_USERS')
const createUser = createAction('CREATE_USER')
const updateUser = createAction('UPDATE_USER')
const deleteUser = createAction('DELETE_USER')

const rootEpic$ = combineEpics(
 createEpic(fetchUsers, api.fetchUsers),
 createEpic(createUser, api.createUser),
 createEpic(updateUser, api.updateUser),
 createEpic(deleteUser, api.deleteUser)
)

export default rootEpic$ // register with redux middleware elsewhere