automatically store the state (pending, rejected, fulfilled) of promissory actions in a place in the redux store.

createProgressReducer.js

import { handleActions } from 'redux-actions'

import methods from 'actions' // `methods` are all the UPPERCASE_STRING constants defining action strings.

export const createProgressReducer = (options = {}) => {
  const initialState = {}
  const progressReducer = Object.keys(methods).reduce((accum, method) => {
    if (typeof method === 'string') {
      accum[`${method}_PENDING`] = (state, action) => {
        return {
          ...state,
          [method]: 'pending'
        }
      }
      accum[`${method}_REJECTED`] = (state, action) => {
        return {
          ...state,
          [method]: 'rejected'
        }
      }
      accum[`${method}_FULFILLED`] = (state, action) => {
        return {
          ...state,
          [method]: 'fulfilled'
        }
      }
    }
    return accum
  }, {})
  return handleActions(progressReducer, initialState)
}