Typescript扩展了任何类型

Question

这是装饰器功能：

const func = className => {
  let instance = new className();
  extendObservable(instance, instance.observables);
  return instance;
};

export default func;

这是班级：

@func
class testClass {
  observables = {
    name: "",
    fname: "",
    age: 0,
  };
  .
  .
  .
  .
  someMethod() {
    let a = this.name  // <<<<< I'm getting property name does
                       //       not exist on type testClass
  }
}

如何在不复制所有可观察量的情况下删除此错误＆＃39;像这样的类的属性：

 name: string
 fname: string
 age: number
 observables = {
    name: "",
    fname: "",
    age: 0,
  };