Vue.js: How to type emits in Vue 3 with TypeScript?

1<script setup lang="ts">
2const emit = defineEmits<{
3    (e: "update", value: string): void
4    (e: "delete", id: number): void
5    (e: "submit", data: FormData): void
6}>()
7
8function handleClick() {
9    emit("update", "new value")
10}
11</script>

1<script setup lang="ts">
2const emit = defineEmits<{
3    (e: "update", value: string): void
4}>()
5
6// Runtime validation
7const emit = defineEmits({
8    update: (value: string) => typeof value === "string"
9})
10</script>