setup expose, component should have typescript declaration

[xiaoxiangmoe]

import { defineComponent, ref, Ref } from 'vue';

const Hello = defineComponent({
    props: { msg: String },
    setup: (props, { expose }) => {
        const count: Ref<number> = ref(0);
        expose({ a: 1, b: 2 });
        return () => <div>{count.value} </div>;
    },
});

declare const hello: InstanceType<typeof Hello>;

a and b are not exposed.

releated issue:
#4397

[posva]

Duplicate of #4397
Don't skip the issue template