actions.js

import httpClient from './httpClient'

const login = (email, password) => (dispatch) => {
  return httpClient.login(email, password)
    .then(response => {
      httpClient.token = response.token
      dispatch(loginSuccess(response))
    })
}

const refreshToken = () => (dispatch) => {
  httpClient.refreshToken()
    .then(token => {
      httpClient.token = token
      dispatch(refreshTokenSuccess(token)
    })
}

httpClient.js

import HttpClient from './HttpClient'

// export an instance, aka a "Singleton", of HttpClient
export default new HttpClient()