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520 lines
19 KiB
Markdown
520 lines
19 KiB
Markdown
---
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title: Upgrade Guide
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description: 'Learn how to upgrade to the latest Nuxt version.'
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navigation.icon: i-ph-arrow-circle-up-duotone
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---
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## Upgrading Nuxt
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### Latest release
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To upgrade Nuxt to the [latest release](https://github.com/nuxt/nuxt/releases), use the `nuxi upgrade` command.
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::code-group
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```bash [npm]
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npx nuxi upgrade
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```
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```bash [yarn]
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yarn dlx nuxi upgrade
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```
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```bash [pnpm]
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pnpm dlx nuxi upgrade
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```
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```bash [bun]
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bunx nuxi upgrade
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```
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::
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### Nightly Release Channel
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To use the latest Nuxt build and test features before their release, read about the [nightly release channel](/docs/guide/going-further/nightly-release-channel) guide.
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## Testing Nuxt 4
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Nuxt 4 is planned to be released **on or before June 14** (though obviously this is dependent on having enough time after Nitro's major release to be properly tested in the community, so be aware that this is not an exact date).
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Until then, it is possible to test many of Nuxt 4's breaking changes from Nuxt version 3.12 or via the nightly release channel.
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::tip{icon="i-ph-video-duotone" to="https://www.youtube.com/watch?v=r4wFKlcJK6c" target="_blank"}
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Watch a video from Alexander Lichter showing how to opt in to Nuxt 4's breaking changes already.
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::
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### Opting in to Nuxt 4
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First, opt in to the nightly release channel [following these steps](/docs/guide/going-further/nightly-release-channel#opting-in).
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Then you can set your `compatibilityVersion` to match Nuxt 4 behavior:
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```ts twoslash [nuxt.config.ts]
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export default defineNuxtConfig({
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future: {
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compatibilityVersion: 4,
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},
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// To re-enable _all_ Nuxt v3 behavior, set the following options:
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// srcDir: '.',
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// dir: {
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// app: 'app'
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// },
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// experimental: {
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// sharedPrerenderData: false,
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// compileTemplate: true,
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// resetAsyncDataToUndefined: true,
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// templateUtils: true,
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// relativeWatchPaths: true,
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// defaults: {
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// useAsyncData: {
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// deep: true
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// }
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// }
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// },
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// unhead: {
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// renderSSRHeadOptions: {
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// omitLineBreaks: false
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// }
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// }
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})
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```
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When you set your `compatibilityVersion` to `4`, defaults throughout your Nuxt configuration will change to opt in to Nuxt v4 behavior, but you can granularly re-enable Nuxt v3 behavior when testing, following the commented out lines above. Please file issues if so, so that we can address them in Nuxt or in the ecosystem.
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### Migrating to Nuxt 4
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Breaking or significant changes will be noted here along with migration steps for backward/forward compatibility.
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::alert
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This section is subject to change until the final release, so please check back here regularly if you are testing Nuxt 4 using `compatibilityVersion: 4`.
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::
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#### New Directory Structure
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🚦 **Impact Level**: Significant
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Nuxt now defaults to a new directory structure, with backwards compatibility (so if Nuxt detects you are using the old structure, such as with a top-level `pages/` directory, this new structure will not apply).
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👉 [See full RFC](https://github.com/nuxt/nuxt/issues/26444)
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##### What Changed
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* the new Nuxt default `srcDir` is `app/` by default, and most things are resolved from there.
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* `serverDir` now defaults to `<rootDir>/server` rather than `<srcDir>/server`
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* `modules` and `public` are resolved relative to `<rootDir>` by default
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* a new `dir.app` is added, which is the directory we look for `router.options.ts` and `spa-loading-template.html` - this defaults to `<srcDir>/`
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<details>
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<summary>An example v4 folder structure.</summary>
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```sh
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.output/
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.nuxt/
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app/
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assets/
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components/
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composables/
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layouts/
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middleware/
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pages/
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plugins/
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utils/
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app.config.ts
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app.vue
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router.options.ts
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modules/
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node_modules/
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public/
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server/
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api/
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middleware/
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plugins/
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routes/
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utils/
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nuxt.config.ts
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```
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</details>
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👉 For more details, see the [PR implementing this change](https://github.com/nuxt/nuxt/pull/27029).
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##### Reasons for Change
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1. **Performance** - placing all your code in the root of your repo causes issues with `.git/` and `node_modules/` folders being scanned/included by FS watchers which can significantly delay startup on non-Mac OSes.
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1. **IDE type-safety** - `server/` and the rest of your app are running in two entirely different contexts with different global imports available, and making sure `server/` isn't _inside_ the same folder as the rest of your app is a big first step to ensuring you get good auto-completes in your IDE.
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##### Migration Steps
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1. Create a new directory called `app/`.
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1. Move your `assets/`, `components/`, `composables/`, `layouts/`, `middleware/`, `pages/`, `plugins/` and `utils/` folders under it, as well as `app.vue`, `error.vue`, `app.config.ts`. If you have an `app/router-options.ts` or `app/spa-loading-template.html`, these paths remain the same.
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1. Make sure your `nuxt.config.ts`, `modules/`, `public/` and `server/` folders remain outside the `app/` folder, in the root of your project.
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However, migration is _not required_. If you wish to keep your current folder structure, Nuxt should auto-detect it. (If it does not, please raise an issue.) The one exception is that if you _already_ have a custom `srcDir`. In this case, you should be aware that your `modules/`, `public/` and `server/` folders will be resolved from your `rootDir` rather than from your custom `srcDir`. You can override this by configuring `dir.modules`, `dir.public` and `serverDir` if you need to.
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You can also force a v3 folder structure with the following configuration:
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```ts [nuxt.config.ts]
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export default defineNuxtConfig({
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// This reverts the new srcDir default from `app` back to your root directory
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srcDir: '.',
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// This specifies the directory prefix for `app/router.options.ts` and `app/spa-loading-template.html`
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dir: {
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app: 'app'
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}
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})
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```
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#### Shared Prerender Data
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🚦 **Impact Level**: Medium
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##### What Changed
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We enabled a previously experimental feature to share data from `useAsyncData` and `useFetch` calls, across different pages. See [original PR](https://github.com/nuxt/nuxt/pull/24894).
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##### Reasons for Change
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This feature automatically shares payload _data_ between pages that are prerendered. This can result in a significant performance improvement when prerendering sites that use `useAsyncData` or `useFetch` and fetch the same data in different pages.
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For example, if your site requires a `useFetch` call for every page (for example, to get navigation data for a menu, or site settings from a CMS), this data would only be fetched once when prerendering the first page that uses it, and then cached for use when prerendering other pages.
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##### Migration Steps
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Make sure that any unique key of your data is always resolvable to the same data. For example, if you are using `useAsyncData` to fetch data related to a particular page, you should provide a key that uniquely matches that data. (`useFetch` should do this automatically for you.)
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```ts [app/pages/test/[slug\\].vue]
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// This would be unsafe in a dynamic page (e.g. `[slug].vue`) because the route slug makes a difference
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// to the data fetched, but Nuxt can't know that because it's not reflected in the key.
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const route = useRoute()
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const { data } = await useAsyncData(async () => {
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return await $fetch(`/api/my-page/${route.params.slug}`)
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})
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// Instead, you should use a key that uniquely identifies the data fetched.
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const { data } = await useAsyncData(route.params.slug, async () => {
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return await $fetch(`/api/my-page/${route.params.slug}`)
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})
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```
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Alternatively, you can disable this feature with:
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```ts twoslash [nuxt.config.ts]
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export default defineNuxtConfig({
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experimental: {
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sharedPrerenderData: false
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}
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})
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```
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#### Default `data` and `error` values in `useAsyncData` and `useFetch`
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🚦 **Impact Level**: Minimal
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##### What Changed
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`data` and `error` objects returned from `useAsyncData` will now default to `undefined`.
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##### Reasons for Change
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Previously `data` was initialized to `null` but reset in `clearNuxtData` to `undefined`. `error` was initialized to `null`. This change is to bring greater consistency.
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##### Migration Steps
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If you encounter any issues you can revert back to the previous behavior with:
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```ts twoslash [nuxt.config.ts]
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export default defineNuxtConfig({
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experimental: {
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defaults: {
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useAsyncData: {
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value: 'null',
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errorValue: 'null'
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}
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}
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}
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})
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```
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Please report an issue if you are doing this, as we do not plan to keep this as configurable.
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#### Removal of deprecated `boolean` values for `dedupe` option when calling `refresh` in `useAsyncData` and `useFetch`
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🚦 **Impact Level**: Minimal
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##### What Changed
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Previously it was possible to pass `dedupe: boolean` to `refresh`. These were aliases of `cancel` (`true`) and `defer` (`false`).
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```ts twoslash [app.vue]
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const { refresh } = await useAsyncData(async () => ({ message: 'Hello, Nuxt 3!' }))
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async function refreshData () {
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await refresh({ dedupe: true })
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}
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```
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##### Reasons for Change
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These aliases were removed, for greater clarity.
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The issue came up when adding `dedupe` as an option to `useAsyncData`, and we removed the boolean values as they ended up being _opposites_.
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`refresh({ dedupe: false })` meant 'do not _cancel_ existing requests in favour of this new one'. But passing `dedupe: true` within the options of `useAsyncData` means 'do not make any new requests if there is an existing pending request.' (See [PR](https://github.com/nuxt/nuxt/pull/24564#pullrequestreview-1764584361).)
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##### Migration Steps
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The migration should be straightforward:
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```diff
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const { refresh } = await useAsyncData(async () => ({ message: 'Hello, Nuxt 3!' }))
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async function refreshData () {
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- await refresh({ dedupe: true })
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+ await refresh({ dedupe: 'cancel' })
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- await refresh({ dedupe: false })
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+ await refresh({ dedupe: 'defer' })
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}
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```
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#### Respect defaults when clearing `data` in `useAsyncData` and `useFetch`
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🚦 **Impact Level**: Minimal
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##### What Changed
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If you provide a custom `default` value for `useAsyncData`, this will now be used when calling `clear` or `clearNuxtData` and it will be reset to its default value rather than simply unset.
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##### Reasons for Change
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Often users set an appropriately empty value, such as an empty array, to avoid the need to check for `null`/`undefined` when iterating over it. This should be respected when resetting/clearing the data.
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##### Migration Steps
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If you encounter any issues you can revert back to the previous behavior, for now, with:
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```ts twoslash [nuxt.config.ts]
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export default defineNuxtConfig({
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experimental: {
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resetAsyncDataToUndefined: true,
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}
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})
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```
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Please report an issue if you are doing so, as we do not plan to keep this as configurable.
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#### Shallow Data Reactivity in `useAsyncData` and `useFetch`
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🚦 **Impact Level**: Minimal
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The `data` object returned from `useAsyncData`, `useFetch`, `useLazyAsyncData` and `useLazyFetch` is now a `shallowRef` rather than a `ref`.
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##### What Changed
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When new data is fetched, anything depending on `data` will still be reactive because the entire object is replaced. But if your code changes a property _within_ that data structure, this will not trigger any reactivity in your app.
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##### Reasons for Change
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This brings a **significant** performance improvement for deeply nested objects and arrays because Vue does not need to watch every single property/array for modification. In most cases, `data` should also be immutable.
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##### Migration Steps
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In most cases, no migration steps are required, but if you rely on the reactivity of the data object then you have two options:
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1. You can granularly opt in to deep reactivity on a per-composable basis:
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```diff
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- const { data } = useFetch('/api/test')
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+ const { data } = useFetch('/api/test', { deep: true })
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```
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1. You can change the default behavior on a project-wide basis (not recommended):
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```ts twoslash [nuxt.config.ts]
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export default defineNuxtConfig({
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experimental: {
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defaults: {
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useAsyncData: {
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deep: true
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}
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}
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}
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})
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```
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#### Absolute Watch Paths in `builder:watch`
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🚦 **Impact Level**: Minimal
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##### What Changed
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The Nuxt `builder:watch` hook now emits a path which is absolute rather than relative to your project `srcDir`.
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##### Reasons for Change
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This allows us to support watching paths which are outside your `srcDir`, and offers better support for layers and other more complex patterns.
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##### Migration Steps
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We have already proactively migrated the public Nuxt modules which we are aware use this hook. See [issue #25339](https://github.com/nuxt/nuxt/issues/25339).
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However, if you are a module author using the `builder:watch` hook and wishing to remain backwards/forwards compatible, you can use the following code to ensure that your code works the same in both Nuxt v3 and Nuxt v4:
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```diff
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+ import { relative, resolve } from 'node:fs'
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// ...
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nuxt.hook('builder:watch', async (event, path) => {
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+ path = relative(nuxt.options.srcDir, resolve(nuxt.options.srcDir, path))
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// ...
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})
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```
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#### Directory index scanning
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🚦 **Impact Level**: Medium
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##### What Changed
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Child folders in your `middleware/` folder are also scanned for `index` files and these are now also registered as middleware in your project.
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##### Reasons for Change
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Nuxt scans a number of folders automatically, including `middleware/` and `plugins/`.
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Child folders in your `plugins/` folder are scanned for `index` files and we wanted to make this behavior consistent between scanned directories.
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##### Migration Steps
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Probably no migration is necessary but if you wish to revert to previous behavior you can add a hook to filter out these middleware:
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```ts
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export default defineNuxtConfig({
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hooks: {
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'app:resolve'(app) {
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app.middleware = app.middleware.filter(mw => !/\/index\.[^/]+$/.test(mw.path))
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}
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}
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})
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```
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#### Template Compilation Changes
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🚦 **Impact Level**: Minimal
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##### What Changed
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Previously, Nuxt used `lodash/template` to compile templates located on the file system using the `.ejs` file format/syntax.
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In addition, we provided some template utilities (`serialize`, `importName`, `importSources`) which could be used for code-generation within these templates, which are now being removed.
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##### Reasons for Change
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In Nuxt v3 we moved to a 'virtual' syntax with a `getContents()` function which is much more flexible and performant.
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In addition, `lodash/template` has had a succession of security issues. These do not really apply to Nuxt projects because it is being used at build-time, not runtime, and by trusted code. However, they still appear in security audits. Moreover, `lodash` is a hefty dependency and is unused by most projects.
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Finally, providing code serialization functions directly within Nuxt is not ideal. Instead, we maintain projects like [unjs/knitwork](http://github.com/unjs/knitwork) which can be dependencies of your project, and where security issues can be reported/resolved directly without requiring an upgrade of Nuxt itself.
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##### Migration Steps
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We have raised PRs to update modules using EJS syntax, but if you need to do this yourself, you have three backwards/forwards-compatible alternatives:
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* Moving your string interpolation logic directly into `getContents()`.
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* Using a custom function to handle the replacement, such as in https://github.com/nuxt-modules/color-mode/pull/240.
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* Continuing to use `lodash`, as a dependency of _your_ project rather than Nuxt:
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```diff
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+ import { readFileSync } from 'node:fs'
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+ import { template } from 'lodash-es'
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// ...
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addTemplate({
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fileName: 'appinsights-vue.js'
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options: { /* some options */ },
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- src: resolver.resolve('./runtime/plugin.ejs'),
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+ getContents({ options }) {
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+ const contents = readFileSync(resolver.resolve('./runtime/plugin.ejs'), 'utf-8')
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+ return template(contents)({ options })
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+ },
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})
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```
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Finally, if you are using the template utilities (`serialize`, `importName`, `importSources`), you can replace them as follows with utilities from `knitwork`:
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```ts
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import { genDynamicImport, genImport, genSafeVariableName } from 'knitwork'
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const serialize = (data: any) => JSON.stringify(data, null, 2).replace(/"{(.+)}"(?=,?$)/gm, r => JSON.parse(r).replace(/^{(.*)}$/, '$1'))
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const importSources = (sources: string | string[], { lazy = false } = {}) => {
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return toArray(sources).map((src) => {
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if (lazy) {
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return `const ${genSafeVariableName(src)} = ${genDynamicImport(src, { comment: `webpackChunkName: ${JSON.stringify(src)}` })}`
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}
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return genImport(src, genSafeVariableName(src))
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}).join('\n')
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}
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const importName = genSafeVariableName
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```
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#### Removal of Experimental Features
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🚦 **Impact Level**: Minimal
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##### What Changed
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Four experimental features are no longer configurable in Nuxt 4:
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* `experimental.treeshakeClientOnly` will be `true` (default since v3.0)
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* `experimental.configSchema` will be `true` (default since v3.3)
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* `experimental.polyfillVueUseHead` will be `false` (default since v3.4)
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* `experimental.respectNoSSRHeader` will be `false` (default since v3.4)
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* `vite.devBundler` is no longer configurable - it will use `vite-node` by default
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##### Reasons for Change
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These options have been set to their current values for some time and we do not have a reason to believe that they need to remain configurable.
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##### Migration Steps
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* `polyfillVueUseHead` is implementable in user-land with [this plugin](https://github.com/nuxt/nuxt/blob/f209158352b09d1986aa320e29ff36353b91c358/packages/nuxt/src/head/runtime/plugins/vueuse-head-polyfill.ts#L10-L11)
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* `respectNoSSRHeader`is implementable in user-land with [server middleware](https://github.com/nuxt/nuxt/blob/c660b39447f0d5b8790c0826092638d321cd6821/packages/nuxt/src/core/runtime/nitro/no-ssr.ts#L8-L9)
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## Nuxt 2 vs Nuxt 3
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In the table below, there is a quick comparison between 3 versions of Nuxt:
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Feature / Version | Nuxt 2 | Nuxt Bridge | Nuxt 3
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-------------------------|-----------------|------------------|---------
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Vue | 2 | 2 | 3
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Stability | 😊 Stable | 😊 Stable | 😊 Stable
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Performance | 🏎 Fast | ✈️ Faster | 🚀 Fastest
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Nitro Engine | ❌ | ✅ | ✅
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ESM support | 🌙 Partial | 👍 Better | ✅
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TypeScript | ☑️ Opt-in | 🚧 Partial | ✅
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Composition API | ❌ | 🚧 Partial | ✅
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Options API | ✅ | ✅ | ✅
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Components Auto Import | ✅ | ✅ | ✅
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`<script setup>` syntax | ❌ | 🚧 Partial | ✅
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Auto Imports | ❌ | ✅ | ✅
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webpack | 4 | 4 | 5
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Vite | ⚠️ Partial | 🚧 Partial | ✅
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Nuxi CLI | ❌ Old | ✅ nuxi | ✅ nuxi
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Static sites | ✅ | ✅ | ✅
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## Nuxt 2 to Nuxt 3
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The migration guide provides a step-by-step comparison of Nuxt 2 features to Nuxt 3 features and guidance to adapt your current application.
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::read-more{to="/docs/migration/overview"}
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Check out the **guide to migrating from Nuxt 2 to Nuxt 3**.
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::
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## Nuxt 2 to Nuxt Bridge
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If you prefer to progressively migrate your Nuxt 2 application to Nuxt 3, you can use Nuxt Bridge. Nuxt Bridge is a compatibility layer that allows you to use Nuxt 3 features in Nuxt 2 with an opt-in mechanism.
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::read-more{to="/docs/bridge/overview"}
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**Migrate from Nuxt 2 to Nuxt Bridge**
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::
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