docs: document auto-imports and avoid #app and #imports in examples (#3296)

docs/content/1.getting-started/3.bridge.md

@@ -136,7 +136,7 @@ You may also need to add `@vue/runtime-dom` as a devDependency if you are strugg
 ::
 ::alert
 Keep in mind that all options extended from `./.nuxt/tsconfig.json` will be overwritten by the options defined in your `tsconfig.json`.
-Overwriting options such as `"compilerOptions.paths"` with your own configuration will lead Typescript to not factor in the module resolutions from `./.nuxt/tsconfig.json`. This can lead to module resolutions such as `#app` not being recognized.
+Overwriting options such as `"compilerOptions.paths"` with your own configuration will lead Typescript to not factor in the module resolutions from `./.nuxt/tsconfig.json`. This can lead to module resolutions such as `#imports` not being recognized.
 
 In case you need to extend options provided by `./.nuxt/tsconfig.json` further, you can use the `alias` property withing your `nuxt.config`. `nuxi` will pick them up and extend `./.nuxt/tsconfig.json` accordingly.
 ::
@@ -184,8 +184,6 @@ You can now migrate to the Nuxt 3 plugins API, which is slightly different in fo
 Plugins now take only one argument (`nuxtApp`). You can find out more in [the docs](/docs/directory-structure/plugins).
 
 ```js
-import { defineNuxtPlugin } from '#app'
-
 export default defineNuxtPlugin(nuxtApp => {
   nuxtApp.provide('injected', () => 'my injected function')
   // now available on `nuxtApp.$injected`
@@ -202,7 +200,6 @@ Nuxt Bridge provides a new Nuxt 3 meta API that can be accessed with a new `useM
 
 ```vue
 <script setup>
-import { useMeta } from '#app'
 useMeta({
   title: 'My Nuxt App',
 })

docs/content/1.getting-started/4.bridge-composition-api.md

@@ -35,11 +35,14 @@ Because some composables have been removed and don't yet have a replacement, thi
     * `useStatic` has been removed. There is no current replacement. Feel free to raise a discussion if you have a use case for this.
     * `reqRef` and `reqSsrRef`, which were deprecated, have now been removed entirely. Follow the instructions below regarding [ssrRef](#ssrref-and-shallowssrref) to replace this.
 
-2. Remove any explicit imports of the basic Vue Composition API composables, or move them to import from `#imports` or `vue`.
+2. Remove any explicit imports of the basic Vue Composition API composables.
+
+   ::alert{type=info}
+   Nuxt Bridge [auto-imports](/concepts/auto-imports) Vue composables, you don't have to explicitly import them.
+   ::
 
    ```diff
    - import { ref, useContext } from '@nuxtjs/composition-api`
-   + import { ref } from '#imports'
    ```
 
 3. For each other composable you are using from `@nuxtjs/composition-api`, follow the steps below.
@@ -48,7 +51,7 @@ Because some composables have been removed and don't yet have a replacement, thi
 
 This was a type-helper stub function that is now removed.
 
-Simply remove the `defineNuxtMiddleware` wrapper:
+Remove the `defineNuxtMiddleware` wrapper:
 
 ```diff
 - import { defineNuxtMiddleware } from '@nuxtjs/composition-api`
@@ -68,9 +71,9 @@ export default <Middleware> function (ctx) { }
 
 This was a type-helper stub function that is now removed.
 
-You may also keep using Nuxt 2-style plugins, by simply removing the function (as with [defineNuxtMiddleware](#definenuxtmiddleware)).
+You may also keep using Nuxt 2-style plugins, by removing the function (as with [defineNuxtMiddleware](#definenuxtmiddleware)).
 
-Simply remove the `defineNuxtPlugin` wrapper:
+Remove the `defineNuxtPlugin` wrapper:
 
 ```diff
 - import { defineNuxtPlugin } from '@nuxtjs/composition-api`
@@ -96,7 +99,6 @@ This function has been removed, but its use cases can be met by using `useNuxtAp
 
 ```diff
 - import { onGlobalSetup } from '@nuxtjs/composition-api'
-+ import { defineNuxtPlugin } from '#app'
 
 - export default () => {
 -   onGlobalSetup(() => {
@@ -116,7 +118,6 @@ The key differences are that you must provide a _key_ for this state (which prev
 
 ```diff
 - import { ssrRef } from '@nuxtjs/composition-api'
-+ import { useState } from '#app'
 
 - const ref1 = ssrRef('initialData')
 - const ref2 = ssrRef(() => 'factory function')
@@ -142,7 +143,6 @@ The only key difference is that `useRoute` no longer returns a computed property
 
 ```diff
 - import { useRouter, useRoute } from '@nuxtjs/composition-api'
-+ import { useRouter, useRoute } from '#imports'
 
   const router = useRouter()
   const route = useRoute()
@@ -157,34 +157,18 @@ In order to access Vuex store instance, you can use `useNuxtApp().$store`.
 
 ```diff
 - import { useStore } from '@nuxtjs/composition-api`
-+ import { useNuxtApp } from '#app'
 + const { $store } = useNuxtApp()
 ```
 
-```vue
-<script>
-import { useNuxtApp } from '#app'
-const { $store } = useNuxtApp()
-</script>
-```
-
 ### `useContext` and `withContext`
 
 You can access injected helpers using `useNuxtApp`.
 
 ```diff
 - import { useContext } from '@nuxtjs/composition-api`
-+ import { useNuxtApp } from '#app'
 + const { $axios } = useNuxtApp()
 ```
 
-```vue
-<script>
-import { useNuxtApp } from '#app'
-const { $axios } = useNuxtApp()
-</script>
-```
-
 ::alert{icon=👉}
 `useNuxtApp()` also provides a key called `nuxt2Context` which contains all the same properties you would normally access from Nuxt 2 context, but it's advised _not_ to use this directly, as it won't exist in Nuxt 3. Instead, see if there is another way to access what you need. (If not, please raise a feature request or discussion.)
 ::
@@ -213,7 +197,6 @@ Migrating to the new composables from `useAsync`:
 ```diff
 <script setup>
 - import { useAsync } from '@nuxtjs/composition-api'
-+ import { useLazyAsyncData, useLazyFetch } from '#app'
 - const posts = useAsync(() => $fetch('/api/posts'))
 + const { data: posts } = useLazyAsyncData('posts', () => $fetch('/api/posts'))
 + // or, more simply!
@@ -226,7 +209,6 @@ Migrating to the new composables from `useFetch`:
 ```diff
 <script setup>
 - import { useFetch } from '@nuxtjs/composition-api'
-+ import { useLazyAsyncData, useLazyFetch } from '#app'
 - const posts = ref([])
 - const { fetch } = useFetch(() => { posts.value = await $fetch('/api/posts') })
 + const { data: posts, refresh } = useLazyAsyncData('posts', () => $fetch('/api/posts'))
@@ -246,7 +228,6 @@ In order to interact with `vue-meta`, you may use `useNuxt2Meta`, which will wor
 ```diff
 <script setup>
 - import { useMeta } from '@nuxtjs/composition-api'
-+ import { useNuxt2Meta } from '#app'
   useNuxt2Meta({
     title: 'My Nuxt App',
   })
@@ -257,7 +238,6 @@ You can also pass in computed values or refs, and the meta values will be update
 
 ```ts
 <script setup>
-import { useNuxt2Meta } from '#app'
 const title = ref('my title')
 useNuxt2Meta({
   title,
@@ -275,7 +255,6 @@ Nuxt Bridge also provides a Nuxt 3-compatible meta implementation that can be ac
 ```diff
 <script setup>
 - import { useMeta } from '@nuxtjs/composition-api'
-+ import { useMeta } from '#app'
   useMeta({
     title: 'My Nuxt App',
   })

docs/content/2.concepts/4.auto-imports.md

@@ -0,0 +1,58 @@
+# Auto imports
+
+Nuxt auto-imports helper functions, composables and Vue APIs to use across your application without explicitly importing them. Based on the directory structure, every Nuxt application can also use auto-imports for its own components, composables and plugins.
+
+Contrary to a classic global declaration, Nuxt preserves typings and IDEs completions and hints, and only includes what is actually used in your production code.
+
+::alert{type=info}
+💡 In the documentation, every function that is not explicitly imported is auto-imported by Nuxt and can be used as-is in your code.
+::
+
+::alert{type=info}
+🚧  We are working on a proper API reference that will include every Nuxt auto-imports. For now, you can find a reference on the framework repository: [github.com/nuxt/framework/blob/main/packages/nuxt3/src/auto-imports/imports.ts](https://github.com/nuxt/framework/blob/main/packages/nuxt3/src/auto-imports/imports.ts)  
+::
+
+## Nuxt auto-imports
+
+Nuxt auto-imports functions and composables to perform [data fetching](/docs/usage/data-fetching), get access to the [app context](/docs/usage/nuxt-app) and [runtime config](/docs/usage/runtime-config), manage [state](/docs/usage/state) or define components and plugins.
+
+These functions can be used in components, composables or plugins.
+
+```vue
+<script setup>
+  /* useAsyncData() and $fetch() are auto-imported */
+  const { data, refresh, pending } = await useAsyncData('/api/hello', () => $fetch('/api/hello'))
+</script>
+```
+
+## Vue auto-imports
+
+Vue 3 exposes Reactivity APIs like `ref` or `computed`, as well as lifecycle hooks and helpers that are auto-imported by Nuxt.
+
+```vue
+<script setup>
+  /* ref() and computed() are auto-imported */
+  const count = ref(1)
+  const double = computed(() => count.value * 2)
+</script>
+```
+
+## Directory based auto-imports
+
+Nuxt directly auto-imports files created in defined directories:
+
+- `components/` for [Vue components](/docs/directory-structure/components).
+- `composables/` for [Vue composables](/docs/directory-structure/composables).
+
+## Explicit imports
+
+Every Nuxt auto-import is exposed by the `#imports` alias that can be used to make the import explicit if needed:
+
+```vue
+<script setup>
+  import { ref, computed } from '#imports'
+
+  const count = ref(1)
+  const double = computed(() => count.value * 2)
+</script>
+```

docs/content/2.concepts/6.typescript.md

@@ -31,7 +31,7 @@ Nitro also [auto-generates types](/concepts/server-engine#typed-api-routes) for
 ::
 ::alert
 Keep in mind that all options extended from `./.nuxt/tsconfig.json` will be overwritten by the options defined in your `tsconfig.json`.
-Overwriting options such as `"compilerOptions.paths"` with your own configuration will lead Typescript to not factor in the module resolutions from `./.nuxt/tsconfig.json`. This can lead to module resolutions such as `#app` not being recognized.
+Overwriting options such as `"compilerOptions.paths"` with your own configuration will lead Typescript to not factor in the module resolutions from `./.nuxt/tsconfig.json`. This can lead to module resolutions such as `#imports` not being recognized.
 
 In case you need to extend options provided by `./.nuxt/tsconfig.json` further, you can use the `alias` property within your `nuxt.config`. `nuxi` will pick them up and extend `./.nuxt/tsconfig.json` accordingly.
 ::

docs/content/3.docs/1.usage/4.nuxt-app.md

@@ -9,8 +9,6 @@ In Nuxt 2, this was referred to as [Nuxt context](https://nuxtjs.org/docs/intern
 Within composables, plugins and components you can access `nuxtApp` with `useNuxtApp`:
 
 ```js
-import { useNuxtApp } from '#app'
-
 function useMyComposable () {
   const nuxtApp = useNuxtApp()
   // access runtime nuxt app instance

docs/content/3.docs/2.directory-structure/10.pages.md

@@ -48,11 +48,8 @@ admins 123
 
 If you want to access the route using Composition API, there is a global `useRoute` function that will allow you to access the route just like `this.$route` in the Options API.
 
-```js
+```vue
 <script setup>
-// This import statement is optional since it's automatically imported by Nuxt.
-// import { useRoute } from '#imports'
-
 const route = useRoute()
 
 if (route.params.group === 'admins' && !route.params.id) {

docs/content/3.docs/2.directory-structure/11.plugins.md

@@ -34,8 +34,6 @@ Only `myPlugin.ts` and `myOtherPlugin/index.ts` would be registered.
 The only argument passed to a plugin is [`nuxtApp`](/docs/usage/nuxt-app).
 
 ```ts
-import { defineNuxtPlugin } from '#app'
-
 export default defineNuxtPlugin(nuxtApp => {
   // Doing something with nuxtApp
 })
@@ -46,8 +44,6 @@ export default defineNuxtPlugin(nuxtApp => {
 If you would like to provide a helper on the `NuxtApp` instance, just return it from the plugin under a `provide` key. For example:
 
 ```ts
-import { defineNuxtPlugin } from '#app'
-
 export default defineNuxtPlugin(() => {
   return {
     provide: {
@@ -115,7 +111,6 @@ yarn add --dev vue-gtag-next
 Then create a plugin file `plugins/vue-gtag.client.js`.
 
 ```ts
-import { defineNuxtPlugin } from '#app'
 import VueGtag from 'vue-gtag-next'
 
 export default defineNuxtPlugin((nuxtApp) => {

docs/content/3.docs/2.directory-structure/5.composables.md

@@ -6,7 +6,7 @@ head.title: Composables directory
 
 # Composables directory
 
-Nuxt 3 supports `composables/` directory to automatically import your Vue composables into your application using auto-imports!
+Nuxt 3 supports `composables/` directory to automatically import your Vue composables into your application using [auto-imports](/concepts/auto-imports)!
 
 ## How files are scanned
 
@@ -27,8 +27,6 @@ Only `useFoo.ts` and `useBar/index.ts` would be searched for imports - and if th
 ## Example: (using named export)
 
 ```js [composables/useFoo.ts]
-import { useState } from '#app'
-
 export const useFoo = () => {
   return useState('foo', () => 'bar')
 }
@@ -37,8 +35,6 @@ export const useFoo = () => {
 ## Example: (using default export)
 
 ```js [composables/use-foo.ts or composables/useFoo.ts]
-import { useState } from '#app'
-
 // It will be available as useFoo() (camelCase of file name without extension)
 export default function () {
   return useState('foo', () => 'bar')

docs/content/3.docs/4.advanced/2.modules.md

@@ -72,6 +72,8 @@ export default defineNuxtConfig({
 Creating Nuxt modules involves tedious and common tasks. [Nuxt Kit](/docs/advanced/kit), provides a convenient and standard API to define Nuxt modules using `defineNuxtModule`:
 
 ```js
+import { defineNuxtModule } from '@nuxt/kit'
+
 export default defineNuxtModule({
   meta: {
     // Usually  npm package name of your module
@@ -190,6 +192,8 @@ export default defineNuxtModule<ModuleOptions>({
 If your module will provide a CSS library, make sure to check if the user already included the library to avoid duplicates and add an option to disable the CSS library in the module.
 
 ```ts
+import { defineNuxtModule } from '@nuxt/kit'
+
 export default defineNuxtModule({
   setup (options, nuxt) {
     nuxt.options.css.push('font-awesome/css/font-awesome.css')
@@ -202,6 +206,8 @@ export default defineNuxtModule({
 If your module opens handles or starts a watcher, we should close it when the nuxt lifecycle is done. For this, we can use the `close` hook:
 
 ```ts
+import { defineNuxtModule } from '@nuxt/kit'
+
 export default defineNuxtModule({
   setup (options, nuxt) {
     nuxt.hook('close', async nuxt => {