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