mirror of
https://github.com/nuxt/nuxt.git
synced 2024-12-05 11:57:13 +00:00
115 lines
3.0 KiB
Markdown
115 lines
3.0 KiB
Markdown
---
|
|
navigation.icon: IconDirectory
|
|
title: 'composables'
|
|
head.title: 'composables/'
|
|
description: Use the composables/ directory to auto-import your Vue composables into your application.
|
|
---
|
|
|
|
# Composables Directory
|
|
|
|
Nuxt 3 uses the [`composables/` directory](/docs/guide/directory-structure/composables) to automatically import your Vue composables into your application using [auto-imports](/docs/guide/concepts/auto-imports)!
|
|
|
|
Under the hood, Nuxt auto generates the file `.nuxt/imports.d.ts` to declare the types.
|
|
|
|
Be aware that you have to run `nuxi prepare`, `nuxi dev` or `nuxi build` in order to let Nuxt generate the types. If you create a composable without having the dev server running, TypeScript will throw an error, such as `Cannot find name 'useBar'.`
|
|
|
|
## Usage
|
|
|
|
**Method 1:** Using named export
|
|
|
|
```js [composables/useFoo.ts]
|
|
export const useFoo = () => {
|
|
return useState('foo', () => 'bar')
|
|
}
|
|
```
|
|
|
|
**Method 2:** Using default export
|
|
|
|
```js [composables/use-foo.ts or composables/useFoo.ts]
|
|
// It will be available as useFoo() (camelCase of file name without extension)
|
|
export default function () {
|
|
return useState('foo', () => 'bar')
|
|
}
|
|
```
|
|
|
|
**Usage:** You can now use auto imported composable in `.js`, `.ts` and `.vue` files
|
|
|
|
```vue [app.vue]
|
|
<script setup lang="ts">
|
|
const foo = useFoo()
|
|
</script>
|
|
|
|
<template>
|
|
<div>
|
|
{{ foo }}
|
|
</div>
|
|
</template>
|
|
```
|
|
|
|
::LinkExample{link="/docs/examples/features/auto-imports"}
|
|
::
|
|
|
|
## Examples
|
|
|
|
### Nested Composables
|
|
|
|
You can use a composable within another composable using auto imports:
|
|
|
|
```js [composables/test.ts]
|
|
export const useFoo = () => {
|
|
const nuxtApp = useNuxtApp()
|
|
const bar = useBar()
|
|
}
|
|
```
|
|
|
|
### Access plugin injections
|
|
|
|
You can access [plugin injections](/docs/guide/directory-structure/plugins#automatically-providing-helpers) from composables:
|
|
|
|
```js [composables/test.ts]
|
|
export const useHello = () => {
|
|
const nuxtApp = useNuxtApp()
|
|
return nuxtApp.$hello
|
|
}
|
|
```
|
|
|
|
## How Files Are Scanned
|
|
|
|
Nuxt only scans files at the top level of the [`composables/` directory](/docs/guide/directory-structure/composables), e.g.:
|
|
|
|
```bash
|
|
composables
|
|
| - index.ts // scanned
|
|
| - useFoo.ts // scanned
|
|
| - nested
|
|
| --- utils.ts // not scanned
|
|
```
|
|
|
|
Only `composables/index.ts` and `composables/useFoo.ts` would be searched for imports.
|
|
|
|
To get auto imports working for nested modules, you could either re-export them (recommended) or configure the scanner to include nested directories:
|
|
|
|
**Example:** Re-export the composables you need from the `composables/index.ts` file:
|
|
|
|
```ts [composables/index.ts]
|
|
// Enables auto import for this export
|
|
export { utils } from './nested/utils.ts'
|
|
```
|
|
|
|
**Example:** Scan nested directories inside the `composables/` folder:
|
|
|
|
```ts [nuxt.config.ts]
|
|
export default defineNuxtConfig({
|
|
imports: {
|
|
dirs: [
|
|
// Scan top-level modules
|
|
'composables',
|
|
// ... or scan modules nested one level deep with a specific name and file extension
|
|
'composables/*/index.{ts,js,mjs,mts}',
|
|
// ... or scan all modules within given directory
|
|
'composables/**'
|
|
]
|
|
}
|
|
})
|
|
```
|