Feature request: customized component types export

[xiaoxiangmoe]

<script lang="ts">
import { defineComponent, ref } from 'vue';
export default (defineComponent({
    setup(props, { expose }) {
        const publicCount = ref(0);
        const privateCount = ref(0);
        expose({ publicCount });
        return { publicCount, privateCount };
    },
}) as any as unknown) as never as new () => {
    $props: {}
    publicCount: number;
};
</script>
<template>
    <div>{{ publicCount }}</div>
    <div>{{ privateCount }}</div>
</template>

<script lang="ts">
import { ref } from 'vue';
export default {} as new () => {
    $props: FooProps;
};
</script>
<script setup lang="ts">
export interface FooProps {
    msg: string;
}
defineProps<FooProps>();
const count = ref(0);
</script>
<template>
    <div>{{ count }}</div>
</template>

Maybe we should allow .vue file user to customized component types export. and this should allow:

1. using as cast multiple times.
2. support both script setup and normal component