How to use the @vue/reactivity.TriggerOpTypes.SET function in @vue/reactivity

const obj = reactive({ foo: 1 })
    watch(
      () => {
        dummy = obj.foo
      },
      { onTrigger }
    )
    await nextTick()
    expect(dummy).toBe(1)

    obj.foo++
    await nextTick()
    expect(dummy).toBe(2)
    expect(onTrigger).toHaveBeenCalledTimes(1)
    expect(events[0]).toMatchObject({
      type: TriggerOpTypes.SET,
      key: 'foo',
      oldValue: 1,
      newValue: 2
    })

    delete obj.foo
    await nextTick()
    expect(dummy).toBeUndefined()
    expect(onTrigger).toHaveBeenCalledTimes(2)
    expect(events[1]).toMatchObject({
      type: TriggerOpTypes.DELETE,
      key: 'foo',
      oldValue: 2
    })
  })
})

const Comp = {
      setup() {
        onRenderTriggered(onTrigger)
        return () =>
          h('div', [obj.foo, 'bar' in obj, Object.keys(obj).join('')])
      }
    }

    render(h(Comp), nodeOps.createElement('div'))

    obj.foo++
    await nextTick()
    expect(onTrigger).toHaveBeenCalledTimes(1)
    expect(events[0]).toMatchObject({
      type: TriggerOpTypes.SET,
      key: 'foo',
      oldValue: 1,
      newValue: 2
    })

    delete obj.bar
    await nextTick()
    expect(onTrigger).toHaveBeenCalledTimes(2)
    expect(events[1]).toMatchObject({
      type: TriggerOpTypes.DELETE,
      key: 'bar',
      oldValue: 2
    })
    ;(obj as any).baz = 3
    await nextTick()
    expect(onTrigger).toHaveBeenCalledTimes(3)