Nuxt/test/fixtures/basic/plugins/async-plugin.ts

export default defineNuxtPlugin({
  name: 'async-plugin',
  async setup (/* nuxtApp */) {
    const config1 = useRuntimeConfig()
    await new Promise(resolve => setTimeout(resolve, 100))
    const { data } = useFetch('/api/hey', { key: 'hey' })
    const config2 = useRuntimeConfig()
    return {
      provide: {
        asyncPlugin: () => config1 && config1 === config2
          ? 'Async plugin works! ' + config1.public.testConfig + (data.value?.baz ? 'useFetch works!' : 'useFetch does not work')
          : 'Async plugin failed!'
      }
    }
  },
  parallel: true
})