Nuxt/docs/content/2.guide/6.going-further/6.nuxt-app.md

40 lines
1.3 KiB
Markdown

# NuxtApp
In Nuxt 3, you can access runtime app context within composables, components and plugins.
In Nuxt 2, this was referred to as [Nuxt context](https://nuxtjs.org/docs/internals-glossary/context#the-context).
## Accessing NuxtApp
Within composables, plugins and components you can access `nuxtApp` with `useNuxtApp`:
```js
function useMyComposable () {
const nuxtApp = useNuxtApp()
// access runtime nuxt app instance
}
```
Plugins also receive `nuxtApp` as the first argument for convenience. [Read more about plugins.](/docs/directory-structure/plugins)
::alert{icon=👉}
**`useNuxtApp` (on the server) only works during `setup`, inside Nuxt plugins or `Lifecycle Hooks`**.
::
## Providing helpers
You can provide helpers to be usable across all composables and application. This usually happens within a Nuxt plugin.
```js
const nuxtApp = useNuxtApp()
nuxtApp.provide('hello', (name) => `Hello ${name}!`)
console.log(nuxtApp.$hello('name')) // Prints "Hello name!"
```
In Nuxt 2 plugins, this was referred to as [inject function](https://nuxtjs.org/docs/directory-structure/plugins#inject-in-root--context).
::alert{icon=👉}
It is possible to inject helpers by returning an object with a `provide` key. See the [plugins documentation](/docs/directory-structure/plugins) for more information.
::