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# SvelteKit deployments encountering build issues

142 views · 7 likes · 5 posts


Hughlong Code (@hughlong-code) · 2025-08-15 · ♥ 3

Building for Sveltekit has recently begin encountering this strange error - even for redepoyments of previously successfully deployed commits:

TypeError: builder.hasServerInstrumentationFile is not a function

Is this a known issue? It began occurring this afternoon.


Stanre (@davidhuang1965-4935) · 2025-08-15 · ♥ 1

Same issue here, bump like hell man


Tyler Palmer (@tyler-hacksplaining) · 2025-08-15

Same bug for me, first encountered around 4:30pm PST. Bump!


Hughlong Code (@hughlong-code) · 2025-08-15 · ♥ 3

I have a fix , seems the adapter/vercel 5.9 package isn’t compatible with svelte kit 2.x.x. Try specifying adapter/vercel 5.8.

npm i -D @sveltejs/adapter-vercel@5.8.2 

then modify your svelte.config.js to use the previous vercel adapter version if it doesn’t already and depends on the deploy time install.

import adapter from '@sveltejs/adapter-vercel';


Stanre (@davidhuang1965-4935) · 2025-08-16

this didn’t work for me at first but later I changed my node version to 22.14.0 and then it worked. Thanks Hughlong.