如何在ArkTS中实现自定义装饰器能力？

//自定义装饰器 
function MyDescriptor(target: Object, key: string, descriptor: PropertyDescriptor) { 
  const originalMethod: Function = descriptor.value 
  descriptor.value = (...args: Object[]) => { 
    // 获取被装饰方法的名称、入参、返回值 
    console.log(`Calling ${target.constructor.name} method ${key} with argument: ${args}`) 
    const result: Object = originalMethod(...args) 
    console.log(`Method ${key} returned: ${result}`) 
    return result 
  } 
  return descriptor 
} 
  @MyDescriptor 
  demoFunc(str:string) { 
    return str 
  } 
  
  aboutToAppear(): void { 
    this.demoFunc('DemoTest') 
  }