reactjs-redux-change-state-in-action-creator-or-reducer-another

actions-another.js

import * as ACTION_TYPES from '../constants/action-types'

const action = (type, payload = {}) => ({ type, payload })

const getUsernameSuccess = username =>
  action(
    ACTION_TYPES.GET_USERNAME_SUCCESS, {
      username,
      message: 'Anything you want to show here.',
    }
  )
  
export {
  getUsernameSuccess,
}

reducer-another.js

import * as ACTIONS from '../constants/action-types'

export default function (state = {}, action) {
  const { type, payload } = action
  switch (type) {
    case ACTIONS.GET_USERNAME_SUCCESS:
      return {
        ...state,
        ...payload,
      }
    ...
    default:
      return state
  }
}