Nuxt/docs/content/2.guide/4.going-further/6.nuxt-app.md

43 lines
1.4 KiB
Markdown
Raw Normal View History

---
title: "NuxtApp"
description: "In Nuxt 3, you can access runtime app context within composables, components and plugins."
---
# 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.](/guide/directory-structure/plugins)
2021-11-15 13:13:00 +00:00
::alert{icon=👉}
**`useNuxtApp` (on the server) only works during `setup`, inside Nuxt plugins or `Lifecycle Hooks`**.
2021-11-15 13:13:00 +00:00
::
## Providing Helpers
2021-11-21 12:31:44 +00:00
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!"
```
2021-11-21 12:31:44 +00:00
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](/guide/directory-structure/plugins) for more information.
::