Function setup

test/apis/watch.spec.js:32–45

()

      const onCleanupSpy = vi.fn()
      const vm = new Vue({
        setup() {
          const a = ref(1)
          watch(
            a,
            (n, o, _onCleanup) => {
              spy(n, o, _onCleanup)
              _onCleanup(onCleanupSpy)
            },
            { immediate: true }
          )
          return {
            a,
          }
        },
        template: `<div>{{a}}</div>`,
      }).$mount()
      expect(spy).toBeCalledTimes(1)