#useState in plugin with "mode": "server"

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astral axleBOT
#

Hi @modest lintel. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

#

Based on the information provided in the knowledge sources, I can offer some insights into your issue with using useState in a server-side plugin for Nuxt 3.

The error you're encountering, "[unimport] failed to find "useState" imported from "#imports"", suggests that there might be an issue with the auto-import functionality for the useState composable on the server side.

Here are a few points to consider:

  1. Server-side plugins: Nuxt 3 allows you to create server-side plugins by using the .server suffix in the filename or by specifying mode: 'server' in the plugin options. This is correctly mentioned in your question.

  2. useState usage: The useState composable is designed to be used within the Vue component lifecycle or within Nuxt plugins. It's important to note that it may not be available in all contexts on the server side.

  3. Plugin definition: When defining a Nuxt plugin, you should use the defineNuxtPlugin helper. This ensures that the plugin is properly set up and has access to the Nuxt context.

  4. Alternative approaches: If useState is not working in your server-side plugin, you might need to consider alternative approaches for managing state on the server.

Given the limited information about your specific implementation, it's difficult to provide a definitive solution. However, here are a few suggestions:

  1. Ensure that you're using the latest version of Nuxt and its dependencies, as there might have been fixes for similar issues in recent updates.

  2. Try using useNuxtApp() instead of useState in your server-side plugin. This might give you access to the Nuxt application instance and allow you to store or retrieve data.

#

  1. If you need to share state between the server and client, consider using the payload property of the Nuxt app, as described in the useNuxtApp composable documentation (https://nuxt.com/docs/api/composables/use-nuxt-app#payload).

  2. If the state is specific to the server and doesn't need to be shared with the client, you might want to use a regular JavaScript variable or a more server-appropriate state management solution.

If these suggestions don't resolve your issue, you may want to create a minimal reproduction of the problem and seek further assistance from the Nuxt community or consider opening an issue on the Nuxt GitHub repository.

Remember that the Nuxt 3 ecosystem is still evolving, and there might be changes or improvements to how server-side plugins and state management work in future updates.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@modest lintel Kapa.ai is still learning and improving, please let me know how I did by reacting below.

modest lintel
#

This is the server plugin:

import defu from 'defu'
import useSanityVisualEditingState from '../composables/useSanityVisualEditingState'
import { defineNuxtPlugin, useCookie, useRuntimeConfig } from '#imports'

export default defineNuxtPlugin(() => {
  const visualEditingState = useSanityVisualEditingState()

  const $config = useRuntimeConfig()
  const { visualEditing } = defu($config.sanity, $config.public.sanity)

  if (visualEditing?.previewMode) {
    const previewModeCookie = useCookie('__sanity_preview')

    visualEditingState.enabled = visualEditing.previewModeId === previewModeCookie.value
  }
})```

And this is the composable:
```ts
import { reactive } from 'vue'
import { useState } from '#imports'

export default function useSanityVisualEditingState() {
  const enabled = useState('_sanity_visualEditing', () => false)

  return reactive({
    enabled,
    isInFrame() {
      if (import.meta.server) return undefined

      return !!(window.self !== window.top || window.opener)
    },
  })
}```

@astral axle
astral axleBOT
#

Let me check the knowledge base for you again. One moment! :books:

#

Based on the code you've provided and the information from the knowledge sources, I can see why you're encountering the issue with useState in your server-side plugin. Let me explain the problem and suggest a solution.

The main issue is that useState is not designed to be used directly in plugins, especially on the server side. As mentioned in the Nuxt documentation on auto-imports (https://nuxt.com/docs/guide/concepts/auto-imports#vue-and-nuxt-composables):

"That means that (with very few exceptions) you cannot use them outside a Nuxt plugin, Nuxt route middleware or Vue setup function. On top of that, you must use them synchronously - that is, you cannot use await before calling a composable..."

In your case, you're trying to use useState indirectly through the useSanityVisualEditingState composable within a plugin. This is likely causing the "[unimport] failed to find "useState" imported from "#imports"" error.

To resolve this issue, you have a few options:

  1. Move the state management logic to a Nuxt plugin that runs on both client and server:
// plugins/sanityVisualEditing.ts
export default defineNuxtPlugin((nuxtApp) => {
  const visualEditingState = reactive({
    enabled: ref(false),
    isInFrame: () => {
      if (import.meta.server) return undefined
      return !!(window.self !== window.top || window.opener)
    }
  })

  nuxtApp.provide('sanityVisualEditingState', visualEditingState)

  const $config = useRuntimeConfig()
  const { visualEditing } = defu($config.sanity, $config.public.sanity)

  if (visualEditing?.previewMode) {
    const previewModeCookie = useCookie('__sanity_preview')
    visualEditingState.enabled = visualEditing.previewModeId === previewModeCookie.value
  }
})
  1. Use useNuxtApp() to store the state:
# 
// plugins/sanityVisualEditing.server.ts
export default defineNuxtPlugin((nuxtApp) => {
  const visualEditingState = reactive({
    enabled: false,
    isInFrame: () => undefined // This will always be undefined on the server
  })

  nuxtApp.provide('sanityVisualEditingState', visualEditingState)

  const $config = useRuntimeConfig()
  const { visualEditing } = defu($config.sanity, $config.public.sanity)

  if (visualEditing?.previewMode) {
    const previewModeCookie = useCookie('__sanity_preview')
    visualEditingState.enabled = visualEditing.previewModeId === previewModeCookie.value
  }
})

Then, in your composable:

// composables/useSanityVisualEditingState.ts
export default function useSanityVisualEditingState() {
  const nuxtApp = useNuxtApp()
  return nuxtApp.$sanityVisualEditingState
}

These approaches avoid using useState directly in the plugin or composable, which should resolve the error you're encountering.

Remember, as mentioned in the Nuxt documentation on state management (https://nuxt.com/docs/getting-started/state-management), it's important to be cautious when defining state outside of <script setup> or setup() function, as it can lead to state being shared across requests on the server.

If you continue to face issues, you might want to consider using a more robust state management solution like Pinia, which is better suited for complex state management scenarios in Nuxt 3 applications.

Nuxt 3 State Management Documentation (https://nuxt.com/docs/getting-started/state-management)
Nuxt 3 Auto-imports Documentation (https://nuxt.com/docs/guide/concepts/auto-imports#vue-and-nuxt-composables)

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@modest lintel Kapa.ai is still learning and improving, please let me know how I did by reacting below.

modest lintel
#

This implementation from @nuxtjs/sanity works, though:

Plugin:

import defu from 'defu'
import { useSanityVisualEditingState } from '../composables/visual-editing'
import { defineNuxtPlugin, useRuntimeConfig, useCookie } from '#imports'

export default defineNuxtPlugin(() => {
  const visualEditingState = useSanityVisualEditingState()

  const $config = useRuntimeConfig()
  const { visualEditing } = import.meta.client ? $config.public.sanity : defu($config.sanity, $config.public.sanity)

  // If preview mode is _configured_ (i.e. `visualEditing.previewMode` is set)
  // check the cookie value against `previewModeId` to determine if visual
  // editing is enabled.
  if (visualEditing?.previewMode) {
    const previewModeCookie = useCookie('__sanity_preview')
    visualEditingState.enabled = previewModeCookie.value === visualEditing.previewModeId
  // If preview mode is _not_ configured, just enable visual editing.
  }
  else if (typeof visualEditing === 'object' && !visualEditing.previewMode) {
    visualEditingState.enabled = true
  }
})

Composable:

import { createSanityClient, useNuxtApp, useRuntimeConfig, useAsyncData, useRouter, useState, reloadNuxtApp } from '#imports'

export const useSanityVisualEditingState = () => {
  const enabled = useState('_sanity_visualEditing', () => false)

  return reactive({
    enabled,
    inFrame: isInFrame(),
  })
}

@astral axle

astral axleBOT
#

Let me check the knowledge base for you again. One moment! :books:

#

Thank you for providing the working implementation from @nuxtjs/sanity. This example indeed shows a different approach that successfully uses useState within a Nuxt 3 plugin. Let's analyze why this works and how it differs from your previous implementation.

  1. Composable Implementation:
    The useSanityVisualEditingState composable in this example is using useState correctly. As mentioned in the Nuxt 3 State Management documentation (https://nuxt.com/docs/getting-started/state-management), useState is designed to create a reactive and SSR-friendly shared state across components.
export const useSanityVisualEditingState = () => {
  const enabled = useState('_sanity_visualEditing', () => false)

  return reactive({
    enabled,
    inFrame: isInFrame(),
  })
}

This implementation is correct because it's using useState within a composable, which is one of the recommended use cases.

  1. Plugin Implementation:
    The plugin is using the composable correctly:
export default defineNuxtPlugin(() => {
  const visualEditingState = useSanityVisualEditingState()
  // ... rest of the plugin code
})

By calling useSanityVisualEditingState() within the plugin, it's indirectly using useState, which is allowed and works as expected.

The key differences that make this implementation work are:

  1. The useState call is encapsulated within a composable, not directly in the plugin.
  2. The plugin is using defineNuxtPlugin, which provides the correct context for using Nuxt composables.
  3. The composable is imported from a local file, ensuring it's available when the plugin runs.

This approach aligns with the Nuxt documentation on composables (https://nuxt.com/docs/guide/directory-structure/composables), which states that composables can be used in plugins.

#

To summarize, this implementation works because it follows Nuxt 3's best practices for state management and plugin development. It uses useState within a composable and then uses that composable within a properly defined Nuxt plugin.

If you're encountering issues with your implementation, try to align it more closely with this working example from @nuxtjs/sanity. Ensure that your useState calls are within composables, and that you're using these composables correctly within your plugins.

Nuxt 3 State Management Documentation (https://nuxt.com/docs/getting-started/state-management)
Nuxt 3 Composables Documentation (https://nuxt.com/docs/guide/directory-structure/composables)

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@modest lintel Kapa.ai is still learning and improving, please let me know how I did by reacting below.

modest lintel
#

Will it work if I use this code instead:

import { reactive } from 'vue'
import { useState } from '#imports'

export const useSanityVisualEditingState = () => {
  const enabled = useState('_sanity_visualEditing', () => false)

  return reactive({
    enabled,
    isInFrame() {
      if (import.meta.server) return undefined

      return !!(window.self !== window.top || window.opener)
    },
  })
}

@astral axle

astral axleBOT
#

Let me check the knowledge base for you again. One moment! :books:

#

Yes, the code you've provided should work correctly. This implementation is very similar to the working example from @nuxtjs/sanity that we discussed earlier. Let's break down why this should work:

  1. The useState composable is used correctly within the useSanityVisualEditingState function. This aligns with the Nuxt 3 State Management documentation (https://nuxt.com/docs/getting-started/state-management), which recommends using useState for creating reactive and SSR-friendly shared state.

  2. The isInFrame function is implemented as a method of the reactive object, which is a valid approach. It also correctly handles the server-side case by returning undefined when import.meta.server is true.

  3. The use of reactive to wrap the returned object ensures that the entire state object is reactive, which is good for performance and consistency.

This implementation addresses the issues we discussed earlier:

  • It doesn't use useState directly in a plugin, but rather in a composable.
  • It properly handles both client-side and server-side scenarios.
  • It follows the pattern of the working @nuxtjs/sanity implementation.

When using this composable in your plugin or components, you would do so like this:

const visualEditingState = useSanityVisualEditingState()

This should work correctly in both client-side and server-side contexts, including within Nuxt plugins.

Remember, as mentioned in the Nuxt documentation on auto-imports (https://nuxt.com/docs/guide/concepts/auto-imports#vue-and-nuxt-composables), it's important to use composables like this synchronously and within the correct lifecycle hooks or functions.

#

If you encounter any issues with this implementation, they are likely not related to the structure of this composable, but might be due to how it's being used in your plugin or other parts of your application.

Nuxt 3 State Management Documentation (https://nuxt.com/docs/getting-started/state-management)
Nuxt 3 Auto-imports Documentation (https://nuxt.com/docs/guide/concepts/auto-imports#vue-and-nuxt-composables)

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: