class FetchResult {
  constructor(code, msg, data = null) {
    if (typeof code !== 'number') {
      throw new Error('Code must be a number')
    }
    if (typeof msg !== 'string') {
      throw new Error('Msg must be a string')
    }
    this.code = code
    this.msg = msg
    this.data = data !== undefined && data !== null ? data : null
  }

  static formatResult(res, code, msg, data = null) {
    return res.status(code).json(new FetchResult(code, msg, data))
  }
}

export default FetchResult