fix: Vercel Edge functions stop working when sitemap or robots is installed in Nuxt 4

[Syourt]

🐛 The bug

View https://nuxt-vercel-api-issues.vercel.app/api/test for the error message.

This is what the Vercel Logs give me, not much:

My reproduction can't be made in Stackblitz as it would not use Vercel Edge Functions to do the api calls. I have added a reproduction in Github which can be used in Vercel.

🛠️ To reproduce

https://github.com/Syourt/nuxt-vercel-api-issues

🌈 Expected behavior

The API should return { message: 'api works' }

ℹ️ Additional context

These modules have been working fine for months in my Nuxt 3 environment. Now I'm upgrading to Nuxt 4 and within Vercel the API calls suddenly stop working. After disabling my modules I found out it was coming from @nuxtjs/sitemap and @nuxtjs/robots. Could be the other SEO plugins cause these issues aswel but I haven't tested it.

I really want to upgrade to Nuxt 4 but since the robots and sitemap modules are also required for my websites I'm kinda stuck.

[harlan-zw]

I believe this is a bug from std-env pollyfills from unenv v2. There's a hacky fix in the latest og image to fix it https://github.com/nuxt-modules/og-image/blob/main/src/build/build.ts#L88

[Syourt]

@harlan-zw thank you for your response. Great that there already seems to be a temporary fix for this issue on Vercel.

It however leaves me with a couple of questions.

• Should this temporary fix also be implemented in the mentioned packages?
  • If so, I can write a pull request but I need a little push in the right direction to where to include this temporary fix.
• Or should I install nuxt seo global package and see it fixed, as nuxt-og-image is then included?

[harlan-zw]

I'm not exactly sure if the problem is because of the modules doing something incorrectly, which is triggered by these other packages or just a bug in the upstream packages, I wanted to confirm before heading upstream.

You can try out the nuxt og image v6 beta and maybe you'll have some luck in the mean time.

[Syourt]

Adding the OG-image beta gives me other runtime errors in local dev. Currently I don't have time to debug. I'll wait with the Nuxt 4 upgrade and check back when packages received updates. If additional information is needed, please let me know.