text: import { 
    REGISTER_SUCCESS,
    REGISTER_FAIL,
    USER_LOADED,
    AUTH_ERROR,
    LOGIN_SUCCESS, 
    LOGIN_FAIL,
    LOGOUT,
    CLEAR_ERRORS
    } from '../types';
  
    export default(state, action) => {
      switch(action.type) {
        case USER_LOADED:
          return {
            ...state,
            isAuthenticated: true,
            loading: false,
            user: action.payload
          }
        case REGISTER_SUCCESS:
        case LOGIN_SUCCESS:
          localStorage.setItem('token', action.payload.token);
          return {
            ...state,
            ...action.payload,
            isAuthenticated: true,
            loading: false
          };
        case REGISTER_FAIL:
        case AUTH_ERROR:  
        case LOGIN_FAIL:
        case LOGOUT:  
          localStorage.removeItem('token');
          return {
            ...state,
            token: null,
            isAuthenticated: false,
            loading: false,
            user: null,
            error: action.payload
          };  
        case CLEAR_ERRORS:
          return {
            ...state,
            error: null
          } ; 
        default:
          return state;
      }
    }