adapter-vercel deployment error with split: true option

[opensas]

Describe the bug

When deploying a sveltekit project with the adapter-vercel and split: true option in svelte.config.js, deployment failes with the following message:

> Using @sveltejs/adapter-vercel
  ✔ done
Build Completed in /vercel/output [6s]
An unexpected error happened when running this build. We have been notified of the problem. If you have any questions, please contact [email protected].

Reproduction

$ pnpm create svelte@latest vercel-split-test

✔ Which Svelte app template? › Skeleton project
✔ Add type checking with TypeScript? › Yes, using TypeScript syntax
✔ Add ESLint for code linting? No
✔ Add Prettier for code formatting? No
✔ Add Playwright for browser testing? No

create repo at github

cd vercel-split-test
git init
git add .
git commit -m "first commit"
git branch -M main
git remote add origin [email protected]:opensas/vercel-split-test.git
git push -u origin main

Import project to vercel with default options

Add "@sveltejs/adapter-vercel": "next" to the devDependencies in your package.json and run pnpm install

update svelte.config.js like this:

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

/** @type {import('@sveltejs/kit').Config} */
const config = {
	// Consult https://github.com./sveltejs/svelte-preprocess
	// for more information about preprocessors
	preprocess: preprocess(),

	kit: {
		adapter: adapter({
			split: true
		})
	}
};

export default config;

Commit and push changes

Logs

with split: true failed deploy:

[23:05:37.074] Cloning github.com./opensas/vercel-split-test (Branch: main, Commit: 85e0833)
[...]

devDependencies:
+ @sveltejs/adapter-auto 1.0.0-next.88
+ @sveltejs/adapter-vercel 1.0.0-next.81
+ @sveltejs/kit 1.0.0-next.551
+ svelte 3.53.1
+ svelte-check 2.9.2
+ svelte-preprocess 4.10.7
+ tslib 2.4.1
+ typescript 4.9.3
+ vite 3.2.4

Done in 3.3s
Running "pnpm run build"

> [email protected] build /vercel/path0
> vite build

vite v3.2.4 building for production...
transforming...
✓ 35 modules transformed.
rendering chunks...
vite v3.2.4 building SSR bundle for production...
transforming...
✓ 54 modules transformed.
Generated an empty chunk: "hooks"
rendering chunks...
.svelte-kit/output/server/vite-manifest.json                   1.39 KiB
.svelte-kit/output/server/index.js                             96.18 KiB
.svelte-kit/output/server/entries/fallbacks/layout.svelte.js   0.23 KiB
.svelte-kit/output/server/entries/fallbacks/error.svelte.js    1.50 KiB
.svelte-kit/output/server/entries/pages/_page.svelte.js        0.31 KiB
.svelte-kit/output/server/chunks/index.js                      3.15 KiB
.svelte-kit/output/server/chunks/hooks.js                      0.00 KiB

Run npm run preview to preview your production build locally.
.svelte-kit/output/client/vite-manifest.json                                         2.78 KiB
.svelte-kit/output/client/_app/immutable/components/layout.svelte-5d5c2819.js        0.53 KiB / gzip: 0.35 KiB
.svelte-kit/output/client/_app/immutable/components/error.svelte-0f9e2f60.js         2.07 KiB / gzip: 0.95 KiB
.svelte-kit/output/client/_app/immutable/components/pages/_page.svelte-aa58de35.js   0.81 KiB / gzip: 0.47 KiB
.svelte-kit/output/client/_app/immutable/chunks/singletons-1aa68ebc.js               1.99 KiB / gzip: 1.07 KiB
.svelte-kit/output/client/_app/immutable/chunks/0-000c53bf.js                        0.09 KiB / gzip: 0.09 KiB
.svelte-kit/output/client/_app/immutable/chunks/1-632860ef.js                        0.09 KiB / gzip: 0.09 KiB
.svelte-kit/output/client/_app/immutable/chunks/2-234451a5.js                        0.09 KiB / gzip: 0.10 KiB
.svelte-kit/output/client/_app/immutable/chunks/index-4ce6debf.js                    6.71 KiB / gzip: 2.72 KiB
.svelte-kit/output/client/_app/immutable/start-745d8c8c.js                           26.54 KiB / gzip: 10.21 KiB

> Using @sveltejs/adapter-vercel
  ✔ done
Build Completed in /vercel/output [6s]
An unexpected error happened when running this build. We have been notified of the problem. If you have any questions, please contact [email protected].

with split: false deploy succeeded:

[...]
.svelte-kit/output/server/chunks/index.js                      3.15 KiB
.svelte-kit/output/server/chunks/hooks.js                      0.00 KiB
  ✔ done
Build Completed in /vercel/output [10s]
Generated build outputs:
 - Static files: 12
 - Serverless Functions: 1
 - Edge Functions: 0
Serverless regions: Washington, D.C., USA
Deployed outputs in 2s
Build completed. Populating build cache...
Uploading build cache [12.14 MB]...
Since the Node.js version () or package manager  could not be determined, Build Cache will not be stored
Done with "."

System Info

System:
    OS: Linux 5.4 Ubuntu 18.04.6 LTS (Bionic Beaver)
    CPU: (8) x64 Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
    Memory: 7.62 GB / 15.08 GB
    Container: Yes
    Shell: 4.4.20 - /bin/bash
  Binaries:
    Node: 16.15.0 - ~/.nvm/versions/node/v16.15.0/bin/node
    npm: 8.5.5 - ~/.nvm/versions/node/v16.15.0/bin/npm
  Browsers:
    Brave Browser: 107.1.45.127
    Chrome: 107.0.5304.110
    Firefox: 107.0
  npmPackages:
    @sveltejs/adapter-vercel: next => 1.0.0-next.81 
    @sveltejs/kit: next => 1.0.0-next.551 
    svelte: ^3.44.0 => 3.53.1 
    vite: ^3.1.0 => 3.2.4

Severity

serious, but I can work around it (just set split: false)

Additional Information

public github repo with the issue and detailed steps to reproduce it: https://github.com./opensas/vercel-split-test#steps-to-reproduce

[opensas]

I can confirm that now it's working fine, great work as usual!