HarmonyOS JSON解析实体方法无法调用

请参考示例如下：

import 'reflect-metadata';
import { plainToClass, Type } from 'class-transformer';

export class WaterStatus {
  code: number = 0
  msg: string = ''
  @Type(() => StatusData)
  data: StatusData = new StatusData()

}

@Observed
export class StatusData {
  is_online: boolean = false
  battery_status?: number = 0 //第1位为有无电池；第2位为是否充电中；第3、4、5位表示电量二进制（0，1，2，3，4，5档）
  water_status?: number = 0 //第1、2位决定，00充足[0]、01缺水[1]、10无水[2]、11水桶异常[3]
  mode?: number = 0
  nodistrub?: string = ''
  timezone?: number = 0
  remind?: number = 0
  change_remind?: number = 0
  sleep_time?: number = 0
  duration?: number = 0


  /**
   * 是否有电池
   */
  hasBattery(): boolean {
    if (this.battery_status == undefined) {
      return false
    }
    return (this.battery_status >> 0 & 0x0001) == 1
  }

  /**
   * 是否充电中
   */
  isCharge(): boolean {
    if (this.battery_status == undefined) {
      return false
    }
    return (this.battery_status >> 1 & 0x0001) == 1
  }

  /**
   * 当前电量
   * 第3、4、5位表示电量二进制（0，1，2，3，4，5档）
   */
  curPower(): number {
    if (this.battery_status == undefined) {
      return 0
    }
    let bit2 = this.battery_status >> 2 & 0x0001
    let bit3 = this.battery_status >> 3 & 0x0001
    let bit4 = this.battery_status >> 4 & 0x0001
    return bit2 + (bit3 << 1) + (bit4 << 2)
  }

  /**
   * 第1、2位决定，00充足[0]、01缺水[1]、10无水[2]、11水桶异常[3]
   */
  waterStatus(): number {
    if (this.water_status == undefined) return 0
    let bit0 = this.water_status >> 0 & 0x0001
    let bit1 = this.water_status >> 1 & 0x0001
    return bit0 + (bit1 << 1)
  }

  /**
   * 出水模式设置 ：第1、2位决定，00感应、01持续、10间接感应
   * @return 0感应、1持续、2间接感应
   */
  getWorkMode(): number {
    if (this.mode == undefined) return 0
    let bit0 = this.mode >> 0 & 0x0001
    let bit1 = this.mode >> 1 & 0x0001
    return bit0 + (bit1 << 1)
  }
}
aboutToAppear(): void {
  let json = '{"code":200,"msg":"ok","data":{"is_online":true,"battery_status":19,"mode":5,"nodistrub":"","timezone":28800,"remind":0,"water_status":0,"change_remind":3,"duration":30,"sleep_time":60}}'
  let jsonData1: ESObject = JSON.parse(json)
  let responseObj1: WaterStatus = plainToClass(WaterStatus, jsonData1);
  responseObj1.data.hasBattery()
  console.log('waterStatus===='+ responseObj1.data.waterStatus())
  console.log('getWorkMode===='+ responseObj1.data.getWorkMode())
}