Function setup

test/v3/reactivity/effectScope.spec.ts:282–288

()

    const root = document.createElement('div')
    const vm = createApp({
      setup() {
        const scope = new EffectScope()
        scope.run(() => {
          watchEffect(() => (dummy = counter.num))
          watchEffect(() => (doubled = counter.num * 2))
        })
      },
    })
    vm.mount(root)