HarmonyOS 数据模型对象赋值问题

module.newsList?.push这样添加对象，显示错误module.newsList报undefined

HotPageModel.getMoreHotPageList(this.page)
  .then(result => {

    result.object?.newsList?.forEach(item => {
      let moduleList: Array<ModuleList> = new Array

      let module = new ModuleList

      let newsList1=new NewsList()
      newsList1.id=item.id

      module.newsList?.push(newsList1)//这个push对象不可以，断点module.newsList报undefined

      moduleList.push(module)
      // module?.newsList?.push(newsList1)

      this.hotPageList1.push(module)

    })

    this.loadMoreStatus = true
  })



  ==================
  export class Object {
  moduleList?:ModuleList[]
  newsList?:NewsList[]
}
export class ModuleList {
  newsList2?:NewsList2[]
  newsList?:NewsList[]
  newsList4?:NewsList4[]

  moduleType?:number
  moduleName?:string
  moduleIorder?:number
  labelColor?:string
  iconUrl?:string
  moduleKey?:string
  extend?:Extend
}

export class NewsList {
  id?:number
  title?:string
  summary?:string
  newstype?:string
  status?:string
}