text: import {
      AUTH_USER,
      UNAUTH_USER,
      AUTH_ERROR,
      FETCH_MESSAGE
  } from '../actions/types';
  
  
  export default function(state={}, action){
  
      switch (action.type){
      case AUTH_USER:
          return {...state, error: '', authenticated: true};
      case UNAUTH_USER:
          return {...state, authenticated: false};
      case AUTH_ERROR:
          return {...state, error: action.payload};
      case FETCH_MESSAGE:
          return {...state, message: action.payload};
      }
  
      return state;
  }
  