Nuxt/docs/2.guide/3.going-further/1.experimental-features.md

---
title: "Experimental Features"
description: "Nuxt experimental features needs to be enabled manually."
---

# Experimental Features

The Nuxt experimental features can be enabled in the Nuxt configuration file.
Internally, Nuxt uses `@nuxt/schema` to define these experimental features. You can refer to the [API documentation](https://nuxt.com/docs/api/configuration/nuxt-config#experimental) or the [source code](https://github.com/nuxt/nuxt/blob/main/packages/schema/src/config/experimental.ts) for more information.

::alert{type=info icon=💡}
Note that these features are experimental and could be removed or modified in the future.
::

## asyncEntry

Enables generation of an async entry point for the Vue bundle, aiding module federation support.

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { asyncEntry: true } })
```

## reactivityTransform

Enables Vue's reactivity transform. Note that this feature has been marked as deprecated in Vue 3.3 and is planned to be removed from core in Vue 3.4.

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { reactivityTransform: true } })
```

::ReadMore{link="docs/getting-started/configuration#enabling-experimental-vue-features"}

## externalVue

Externalizes `vue`, `@vue/*` and `vue-router` when building.
*Enabled by default.*

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { externalVue: true } })
```

::alert{type=warning icon=⚠️}
This feature will likely be removed in Nuxt 3.6.
::

## treeshakeClientOnly

Tree shakes contents of client-only components from server bundle.
*Enabled by default.*

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { treeshakeClientOnly: true } })
```

## emitRouteChunkError

Emits `app:chunkError` hook when there is an error loading vite/webpack chunks. Default behavior is to perform a hard reload of the new route when a chunk fails to load.
You can disable automatic handling by setting this to `false`, or handle chunk errors manually by setting it to `manual`.

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { emitRouteChunkError: 'automatic' } }) // or 'manual' or false
```

## restoreState

Allows Nuxt app state to be restored from `sessionStorage` when reloading the page after a chunk error or manual `reloadNuxtApp()` call.
 To avoid hydration errors, it will be applied only after the Vue app has been mounted,
 meaning there may be a flicker on initial load.

::alert{type=warning icon=⚠️}
Consider carefully before enabling this as it can cause unexpected behavior,
and consider providing explicit keys to [`useState`](/docs/api/composables/use-state) as auto-generated keys may not match across builds.
::

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { restoreState: true } })
```

## inlineSSRStyles

Inlines styles when rendering HTML. This is currently available only when using Vite.
You can also pass a function that receives the path of a Vue component and returns a boolean indicating whether to inline the styles for that component.

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { inlineSSRStyles: true } }) // or a function to determine inlining
```

## noScripts

Disables rendering of Nuxt scripts and JS resource hints. Can also be configured granularly within `routeRules`.

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { noScripts: true } })
```

## renderJsonPayloads

Allows rendering of JSON payloads with support for revivifying complex types.
*Enabled by default.*

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { renderJsonPayloads: true } })
```

## noVueServer

Disables Vue server renderer endpoint within Nitro.

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { noVueServer: true } })
```

## payloadExtraction

Enables extraction of payloads of pages generated with `nuxt generate`.

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { payloadExtraction: true } })
```

## clientFallback

Enables the experimental `<NuxtClientFallback>` component for rendering content on the client if there's an error in SSR.

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { clientFallback: true } })
```

## crossOriginPrefetch

Enables cross-origin prefetch using the Speculation Rules API.

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { crossOriginPrefetch: true } })
```

## viewTransition

Enables View Transition API integration with client-side router.

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { viewTransition: true } })
```

::ReadMore{link="docs/getting-started/transitions#view-transitions-api-experimental"}

## writeEarlyHints

Enables writing of early hints when using node server.

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { writeEarlyHints: true } })
```

## componentIslands

Enables experimental component islands support with `<NuxtIsland>` and `.island.vue` files.

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { componentIslands: true } })
```

::ReadMore{link="docs/guide/directory-structure/components#server-components"}

You can follow the server components roadmap on [GitHub](https://github.com/nuxt/nuxt/issues/19772).

## configSchema

Enables config schema support.
*Enabled by default.*

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { configSchema: true } })
```

## polyfillVueUseHead

Adds a compatibility layer for modules, plugins, or user code relying on the old `@vueuse/head` API.

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { polyfillVueUseHead: false } })
```

## respectNoSSRHeader

Allow disabling Nuxt SSR responses by setting the `x-nuxt-no-ssr` header.

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { respectNoSSRHeader: false } })
```

## localLayerAliases

Resolve `~`, `~~`, `@` and `@@` aliases located within layers with respect to their layer source and root directories.
*Enabled by default.*

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { localLayerAliases: true } })
```

## typedPages

Enable the new experimental typed router using [unplugin-vue-router](https://github.com/posva/unplugin-vue-router).

```ts [nuxt.config.ts]
export defineNuxtConfig({ experimental: { typedPages: false } })
```

Out of the box, this will enable typed usage of `navigateTo`, `<NuxtLink>`, `router.push()` and more.
You can even get typed params within a page by using `const route = useRoute('route-name')`.

## watcher

Set an alternative watcher that will be used as the watching service for Nuxt.
Nuxt uses `chokidar-granular` by default, which will ignore top-level directories
(like `node_modules` and `.git`) that are excluded from watching.
You can set this instead to `parcel` to use `@parcel/watcher`, which may improve
performance in large projects or on Windows platforms.
You can also set this to `chokidar` to watch all files in your source directory.

```ts [nuxt.config.ts]
export defineNuxtConfig({ 
    experimental: { 
        watcher: 'chokidar-granular' // 'chokidar' or 'parcel' are also options
    } 
}) 
```