[Bug Report] define方法，如何订阅私有属性

[franckXu]

• [ ] I have searched the issues of this repository and believe that this is not a duplicate.

Reproduction link

Steps to reproduce

import { define, observable } from "@formily/reactive";
class Todo {
  private loading: boolean;
  constructor() {
    define(this, {
      loading: observable.ref // <<< ts不允许annotations私有属性,，但我不想外部修改loading字段，
      // https://mobx.js.org/observable-state.html#limitations的第８点，有解决方法，formily/reactive有类似的实现吗？
// By default TypeScript will not allow you to annotate private fields. This can be overcome by explicitly passing the relevant 
// private fields as generic argument, like this: makeObservable<MyStore, "privateField" | "privateField2">(this, { privateField: 
// observable, privateField2: observable })
    });
  }
  fetch() {
    this.loading = true;
    // ......
    this.loading = false;
  }
}

What is expected?

无

What is actually happening?

无

Package

@formily/reactive@2.2.15

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[janryWang]

不支持