src/reducers/auth.js

import {
  USER_CHECK,
  USER_CHECK_SUCCESS,
  USER_CHECK_ERROR,
  USER_LOGIN,
  USER_LOGIN_SUCCESS,
  USER_LOGIN_ERROR,
  USER_LOGOUT,
  USER_LOGOUT_SUCCESS,
  USER_LOGOUT_ERROR,
} from '../constants/auth';

const defaultPayload = {
  id: null,
  name: null,
  roles: [],
  isLoggedIn: false,
  inProgress: false,
};

export default (state = defaultPayload, { type, payload, meta }) => {
  switch (type) {
    case USER_LOGIN_SUCCESS:
      return { ...payload, isLoggedIn: true };
    case USER_LOGOUT_SUCCESS:
      return { ...defaultPayload };
    default:
      return state;
  }
};