`defineNuxtComponent`

defineNuxtComponent() is a helper function for defining type safe Vue components using options API similar to defineComponent(). defineNuxtComponent() wrapper also adds support for asyncData and head component options.

Using <script setup lang="ts"> is the recommended way of declaring Vue components in Nuxt 3.

`asyncData()`

If you choose not to use setup() in your app, you can use the asyncData() method within your component definition:

pages/index.vue

<script lang="ts">export default defineNuxtComponent({  async asyncData() {    return {      data: {        greetings: 'hello world!'      }    }  },})</script>

`head()`

If you choose not to use setup() in your app, you can use the head() method within your component definition:

pages/index.vue

<script lang="ts">export default defineNuxtComponent({  head(nuxtApp) {    return {      title: 'My site'    }  },})</script>

createError

You can use this function to create an error object with additional metadata.

defineNuxtRouteMiddleware

Create named route middleware using defineNuxtRouteMiddleware helper function.