In Vue 3, can I still trigger the responsive update of the view after wrapping the Ref object through class attributes?

In Vue 3, updating views with responsive systems is the core mechanism. This article discusses a common scenario: after wrapping the Ref object through class attributes, whether view updates can still be triggered.

Let's look at a sample code:

 class Foo {
  ref: Ref<number> ;
  get value() {
    return this.ref?.value;
  }
  set value(nv: number) {
    this.ref.value = nv;
  }
  constructor() {
    this.ref = ref(0);
  }
}
const foo = new Foo();</number>

In the template, we use {{ foo.value }} to display foo.value . Click the button and foo.value will be increased by itself. The key question is: Will the view be updated after indirectly modifying ref through get and set methods?

The answer is yes. This is because clicking the button triggers the event, calling foo.value . This will execute the set value method, and then execute this.ref.value = nv to directly modify the value of ref . Since ref is responsive, this modification triggers view updates that depend on it.

The process is as follows:

1. Button click: Trigger the click event.
2. Execute auto-increment: foo.value is executed.
3. Calling the setter: set value method is called.
4. Modify the ref value: this.ref.value = nv directly modify ref .
5. View update: Vue 3's responsive system detects a change in ref value and updates the view.

Therefore, even if ref is indirectly modified, Vue 3's responsive system can accurately capture changes and update views efficiently. This proves the power and reliability of the Vue 3 responsive system, maintaining its functionality even in complex data structures.

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