chore: add test for #2048

Author: johnsoncodehk

test-workspace/tsc/vue3/#2048/components.ts

@@ -0,0 +1,5 @@
+import { defineComponent, PropType } from 'vue';
+
+export const Loading = defineComponent({
+	props: { a: {} as PropType<(arg: string) => void> },
+});

test-workspace/tsc/vue3/#2048/main.vue

@@ -0,0 +1,11 @@
+<template>
+	{{ loading }}
+	<loading :a="str => exactType(str, {} as string)"></loading>
+</template>
+
+<script lang="ts" setup>
+import { exactType } from '../../shared';
+import { Loading } from './components';
+
+let loading = false;
+</script>