Function setup

packages/runtime-core/__tests__/apiExpose.spec.ts:8–17

(_, { expose })

    const Child = defineComponent({
      render() {},
      setup(_, { expose }) {
        expose({
          foo: 1,
          bar: ref(2),
        })
        return {
          bar: ref(3),
          baz: ref(4),
        }
      },
    })

    const childRef = ref()