Using mountSuspended() with a component using <script setup> and #import makes an error

[cadenzah]

Environment

Working directory: /home/projects/jvmibwmjx.github
Nuxt project info:

---

• Operating System: Linux
• Node Version: v18.20.3
• Nuxt Version: 3.12.2
• CLI Version: 3.12.0
• Nitro Version: 2.9.6
• Package Manager: yarn@1.22.19
• Builder: -
• User Config: devtools
• Runtime Modules: -
• Build Modules: -

---

Reproduction

https://stackblitz.com/edit/github-mmtufx?file=app.vue

Describe the bug

Let's say there is a root component which I want to mount using @nuxt/test-utils's mountSuspended() API. If this component

• uses <script setup>
• imports composable API from Nuxt #import (i.e. useRouter, useRoute, ...)

it makes an error below and breaks entire test.

stdout | createSuspenseBoundary (/home/projects/jvmibwmjx.github/node_modules/@vue/runtime-core/dist/runtime-core.cjs.js:1451:43)
<Suspense> is an experimental feature and its API will likely change.

stderr | warn$1 (/home/projects/jvmibwmjx.github/node_modules/@vue/runtime-core/dist/runtime-core.cjs.js:50:13)
[Vue warn]: Cannot mutate <script setup> binding "useRouter" from Options API. 
  at <MountSuspendedComponent > 
  at <MountSuspendedHelper> 
  at <Anonymous ref="VTU_COMPONENT" > 
  at <VTUROOT>
[Vue warn]: Unhandled error during execution of render function 
  at <MountSuspendedComponent > 
  at <MountSuspendedHelper> 
  at <Anonymous ref="VTU_COMPONENT" > 
  at <VTUROOT>

Only if the root component meets the condition above, the issue occurs. As you see in the reproduction, if you use #imports and <script setup> in child elements it work fine.

The app itself is built and works fine if I run it.

You can reproduce the issue with the repository link above.

Additional context

No response

Logs

No response

[cadenzah]

FYI @danielroe

[dosubot]

To resolve the issue with mountSuspended() when using a root component with <script setup> and #import for composable APIs from Nuxt, you need to ensure that the setup function is properly wrapped and executed within the Nuxt environment. Here are the steps to address this:

1. Wrap the setup function: Ensure that the setup function is properly wrapped to handle the Nuxt environment.

2. Initialize the Nuxt environment: Make sure the Nuxt environment is correctly initialized before running your tests.

Here is an example of how you can achieve this:

import { mountSuspended } from '@nuxt/test-utils'
import { defineNuxtComponent, tryUseNuxtApp } from '#app'
import { h } from 'vue'

const wrappedSetup = async (props, setupContext) => {
  let setupState = {}
  if (setup) {
    const result = await setup(props, setupContext)
    setupState = result && typeof result === 'object' ? result : {}
    return result
  }
}

const vueApp = tryUseNuxtApp()?.vueApp || globalThis.__unctx__.get('nuxt-app').tryUse().vueApp

const wrapper = await mountSuspended(defineNuxtComponent({
  setup: wrappedSetup,
  render: () => h('div', 'hi there'),
}))

expect(wrapper.html()).toMatchInlineSnapshot('"<div>hi there</div>"')

This code ensures that the setup function is properly handled and the Nuxt environment is correctly initialized. Additionally, you can refer to the test/nuxt/composables.test.ts file for more examples on how to test various composables within the Nuxt environment ^[1][2].

If you are still encountering issues, ensure that your component and its dependencies are correctly set up and that the Nuxt environment is properly initialized before running your tests.

@danielroe, this one's a bit out of my wheelhouse, could you step in and provide your guidance?

To continue talking to Dosu, mention @dosu.

[Aietes]

Is there any update on this? I'm getting a very similar error in my tests, and the workaround above does not seem feasible to be included in a simple test.

[ngajhede]

I am running into the same issue. It's the only component/test running into this, despite all of them using <script setup lang="ts">.

<script lang="ts" setup>
const {
  label,
  error,
  helpText,
  id = 'input',
} = defineProps<{
  label?: string;
  error?: string;
  helpText?: string;
  id?: string;
}>();
const modelValue = defineModel<string | number>();
const attrs = useAttrs();
</script>

[Vue warn]: Cannot mutate <script setup> binding "error" from Options API.

[cadenzah]

Possibly the same issue as #744? Any updates for this or that?
@danielroe

[oskarols]

Related bug report: #986
I have triaged this and renderSuspended starts getting this issue from v13.14.0.

@ngajhede In your case it's breaking since you're using the prop name error.