HarmonyOS 鸿蒙Next代码在DevEco Studio无报错但运行时出现Error message: Cannot read property items of undefined

HarmonyOS 鸿蒙Next代码在DevEco Studio无报错但运行时出现Error message: Cannot read property items of undefined

DevEco Studio一种莫明的错误错让你无所适从，浪费了一天的时间，太菜了。

代码在DevEco Studio没有任何报错，运行时报错Error message:Cannot read property items of undefined，

发现定义的groups[item.ncls].items，items是设置过类型的，但还是报错： ‘items ’is not assignable to parameter of type ‘never’。

感觉 DevEco Studio 编译器似呼有问题

const DreamList: DreamItem[] = [
  new DreamItem(6701,1,1000,'小孩1','周伯通','小孩','w22222','近日有7394人和你查询了相同的梦','w1'),
  new DreamItem(6702,1,1001,'小孩2','周伯通','小孩','w22222','近日有7394人和你查询了相同的梦','w2'),
  new DreamItem(6703,1,1002,'小孩3','周伯通','小孩','w22222','近日有7394人和你查询了相同的梦','w3'),
  new DreamItem(6704,1,1000,'小孩4','周伯通','小孩','w22222','近日有7394人和你查询了相同的梦','w4'),
]

class DreamEntiesModel{
  public  dataArr: DreamItem[] = []
  
  getByNcls(ncls: number){
    return DreamList[ncls]
  }

  listItemGroupByCategory(){

    let categories = DreamCategories
    let items = DreamList
  
    let groups = categories.map(itemCategory => new GroupInfo(itemCategory, this.dataArr ))
    console.log("itemModel","查看group数据111组装",JSON.stringify(groups))
    items.forEach(item =>{
      console.log("itemModel","查看group数据2222组装",'groups['+item.ncls+']')
      let data:DreamItem = item as DreamItem
      groups[item.ncls].items.push(data)
      console.log("itemModel","查看group数据333组装",JSON.stringify(groups[item.ncls].items))
    })
   
    return groups
   }
}

let DreamEnties1 = new DreamEntiesModel()

export default DreamEnties1 as DreamEntiesModel

export default class GroupInfo<TYPE, DreamItem> {
  /**
   * 分组类型
   */
  type: TYPE
  /**
   * 组内数据集合
   */
  items: DreamItem[]

  constructor(type: TYPE, items: DreamItem[]) {
    this.type = type
    this.items = items
  }
}