Vue.js: What is the difference between defineEventHandler and eventHandler in Nitro?

1// server/api/users.ts
2export default defineEventHandler(async (event) => {
3    const query = getQuery(event)
4    const body = await readBody(event)
5    return { users: [] }
6})

1import { eventHandler } from "h3"
2
3export default eventHandler((event) => {
4    return { users: [] }
5})