Occasional error with `useTranslation` on Vercel

[DavidDeSloovere]

Describe the bug

Related to #23 because it's the same error, but not because useTranslation is called in request hook.

Deploy the reproduction to Vercel and put a ping on it.
I have got uptime kuma calling /api/webhook endpoint every minute. Works fine for about 2 hours and then suddenly

[nuxt] [request error] [unhandled] [500] middleware not initialized, please setup `onRequest` and `onAfterResponse` options of `createApp` with the middleware obtained with `defineI18nMiddleware`

Could be a nuxt/i18n issue.

Edit: no issue on Cloudflare, where I also deployed the same reproduction.

Reproduction

https://github.com/DavidDeSloovere/nuxt-i18n-nitro-issue31

Deploy to Vercel. Call /api/webhook.

System Info

Deployed on Vercel. With Node 22.x

Used Package Manager

pnpm

Additional context

The error can also be thrown just after deployment.
My guess would be that the order in which plugin/middleware/eventhandler get executed isn't correct.
So I would assume it has something to do with cold start and the order of the i18n middleware that is running AFTER the request is being handled.

Log of failed request:
"onRequest" comes AFTER "webhook entered"

Log of working request:

Validations

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• Read the Contributing Guide.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A, please open a GitHub Discussion instead.
• The provided reproduction is a minimal reproducible of the bug.

[tlkiong]

Just curious. Is this repo still active?

[dargmuesli]

Notifications got lost for @kazupon, but I pinged him about it and he'll check on the features and fixes while I assist with the general chores.