Sveltekit with ts does not work on vercel

[SaranSundar]

Describe the bug

I noticed if the file is named

svelte.config.ts it doesn't work, but if it is svelte.config.js it works.

Running build in Cleveland, USA (East) – cle1
--
11:58:51.444 | Cloning github.com/SaranSundar/architect (Branch: main, Commit: ab80f40)
11:58:52.094 | Cloning completed: 650.047ms
11:58:53.007 | Restored build cache
11:58:53.033 | Running "vercel build"
11:58:53.505 | Vercel CLI 30.2.3
11:58:54.090 | Installing dependencies...
11:58:54.985 |  
11:58:54.986 | up to date in 611ms
11:58:54.986 |  
11:58:54.986 | 71 packages are looking for funding
11:58:54.986 | run `npm fund` for details
11:58:54.997 | Detected `package-lock.json` generated by npm 7+...
11:58:54.997 | Running "npm run build"
11:58:55.236 |  
11:58:55.236 | > [email protected] build
11:58:55.236 | > vite build
11:58:55.236 |  
11:58:55.434 | ▲ [WARNING] Cannot find base config file "./.svelte-kit/tsconfig.json" [tsconfig.json]
11:58:55.434 |  
11:58:55.434 | tsconfig.json:2:12:
11:58:55.434 | 2 │   "extends": "./.svelte-kit/tsconfig.json",
11:58:55.434 | ╵              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11:58:55.435 |  
11:58:56.082 |  
11:58:56.082 | vite v4.3.9 building SSR bundle for production...
11:58:56.109 | transforming...
11:58:57.821 | ✓ 77 modules transformed.
11:58:57.868 | rendering chunks...
11:58:58.048 |  
11:58:58.048 | vite v4.3.9 building for production...
11:58:58.053 | transforming...
11:58:58.743 | ✓ 67 modules transformed.
11:58:58.801 | rendering chunks...
11:58:58.844 | computing gzip size...
11:58:58.859 | .svelte-kit/output/client/_app/version.json                              0.03 kB │ gzip:  0.05 kB
11:58:58.859 | .svelte-kit/output/client/vite-manifest.json                             2.53 kB │ gzip:  0.46 kB
11:58:58.859 | .svelte-kit/output/client/_app/immutable/assets/0.942d8a14.css          84.30 kB │ gzip: 12.00 kB
11:58:58.860 | .svelte-kit/output/client/_app/immutable/chunks/stores.47b3d873.js       0.24 kB │ gzip:  0.17 kB
11:58:58.860 | .svelte-kit/output/client/_app/immutable/nodes/1.fe1fd95d.js             0.84 kB │ gzip:  0.52 kB
11:58:58.860 | .svelte-kit/output/client/_app/immutable/nodes/2.e91dc94d.js             1.13 kB │ gzip:  0.70 kB
11:58:58.860 | .svelte-kit/output/client/_app/immutable/chunks/scheduler.e108d1fd.js    2.16 kB │ gzip:  1.02 kB
11:58:58.860 | .svelte-kit/output/client/_app/immutable/chunks/singletons.11e535a3.js   2.85 kB │ gzip:  1.46 kB
11:58:58.860 | .svelte-kit/output/client/_app/immutable/chunks/index.0719bd3d.js        5.44 kB │ gzip:  2.31 kB
11:58:58.860 | .svelte-kit/output/client/_app/immutable/entry/app.56c77fed.js           5.76 kB │ gzip:  2.24 kB
11:58:58.860 | .svelte-kit/output/client/_app/immutable/nodes/0.eb644cef.js             6.95 kB │ gzip:  2.84 kB
11:58:58.861 | .svelte-kit/output/client/_app/immutable/entry/start.9fa4caef.js        24.00 kB │ gzip:  9.52 kB
11:58:58.861 | ✓ built in 812ms
11:58:59.000 | .svelte-kit/output/server/vite-manifest.json                           2.02 kB
11:58:59.000 | .svelte-kit/output/server/_app/immutable/assets/_layout.55db779d.css  84.29 kB
11:58:59.000 | .svelte-kit/output/server/entries/pages/_page.js                       0.05 kB
11:58:59.000 | .svelte-kit/output/server/entries/pages/_layout.server.js              0.16 kB
11:58:59.000 | .svelte-kit/output/server/internal.js                                  0.24 kB
11:58:59.000 | .svelte-kit/output/server/chunks/shared-server.js                      0.28 kB
11:58:59.000 | .svelte-kit/output/server/entries/fallbacks/error.svelte.js            0.47 kB
11:58:59.001 | .svelte-kit/output/server/chunks/stores.js                             0.52 kB
11:58:59.001 | .svelte-kit/output/server/entries/pages/_layout.svelte.js              0.62 kB
11:58:59.001 | .svelte-kit/output/server/entries/pages/_page.svelte.js                0.76 kB
11:58:59.001 | .svelte-kit/output/server/chunks/ssr.js                                3.35 kB
11:58:59.001 | .svelte-kit/output/server/chunks/internal.js                           5.26 kB
11:58:59.001 | .svelte-kit/output/server/index.js                                    86.49 kB
11:58:59.001 |  
11:58:59.002 | Run npm run preview to preview your production build locally.
11:58:59.002 |  
11:58:59.002 | No adapter specified
11:58:59.002 | See https://kit.svelte.dev/docs/adapters to learn how to configure your app to run on the platform of your choosing
11:58:59.002 | ✓ built in 2.92s
11:58:59.164 | Error: No Output Directory named "public" found after the Build completed. You can configure the Output Directory in your Project Settings.
11:58:59.164 | Learn More: https://vercel.link/missing-public-directory
11:58:59.504 | STATIC_BUILD_NO_OUT_DIR: No Output Directory named "public" found after the Build completed. You can configure the Output Directory in your Project Settings.

import adapter from '@sveltejs/adapter-vercel';
import { vitePreprocess } from '@sveltejs/kit/vite';

/** @type {import('@sveltejs/kit').Config} */
const config = {
	// Consult https://kit.svelte.dev/docs/integrations#preprocessors
	// for more information about preprocessors
	preprocess: vitePreprocess(),

	kit: {
		// adapter-auto only supports some environments, see https://kit.svelte.dev/docs/adapter-auto for a list.
		// If your environment is not supported or you settled on a specific environment, switch out the adapter.
		// See https://kit.svelte.dev/docs/adapters for more information about adapters.
		adapter: adapter({
			runtime: 'nodejs18.x'
		})
	}
};

export default config;

Reproduction

Use vercels deploy for sveltekit, update packages to below and try a deploy

{
	"name": "test",
	"version": "0.0.1",
	"scripts": {
		"dev": "vite dev",
		"build": "vite build",
		"preview": "vite preview",
		"test": "playwright test",
		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
		"test:unit": "vitest",
		"lint": "prettier --plugin-search-dir . --check . && eslint .",
		"format": "prettier --plugin-search-dir . --write ."
	},
	"devDependencies": {
		"@fontsource/fira-mono": "^5.0.3",
		"@playwright/test": "^1.35.1",
		"@sveltejs/adapter-vercel": "^3.0.1",
		"@sveltejs/kit": "^1.20.5",
		"@types/cookie": "^0.5.1",
		"@typescript-eslint/eslint-plugin": "^5.60.1",
		"@typescript-eslint/parser": "^5.60.1",
		"autoprefixer": "^10.4.14",
		"eslint": "^8.43.0",
		"eslint-config-prettier": "^8.8.0",
		"eslint-plugin-svelte": "^2.31.1",
		"firebase": "^9.23.0",
		"postcss": "^8.4.24",
		"prettier": "^2.8.8",
		"prettier-plugin-svelte": "^2.10.1",
		"svelte": "^4.0.0",
		"svelte-check": "^3.4.4",
		"tailwindcss": "^3.3.2",
		"tslib": "^2.6.0",
		"typescript": "^5.1.3",
		"vite": "^4.3.9",
		"vitest": "^0.32.2",
		"web-vitals": "^3.3.2",
		"@floating-ui/dom": "^1.4.2",
		"@skeletonlabs/skeleton": "^1.8.0",
		"@tailwindcss/forms": "^0.5.3",
		"@tailwindcss/typography": "^0.5.9",
		"highlight.js": "^11.8.0"
	},
	"type": "module"
}

Logs

When i use the js version output on vercel is correct

Run npm run preview to preview your production build locally.
> Using @sveltejs/adapter-vercel
  ✔ done
✓ built in 4.87s
Build Completed in /vercel/output [7s]
Deploying outputs...
Deployment completed

System Info

N/A on vercel

Severity

serious, but I can work around it

Additional Information

No response

[Conduitry]

There is no svelte.config.ts - #2576.

[SaranSundar]

Oh my bad thanks, I'm new to svelte just tried using this

https://www.skeleton.dev/

and there typescript app starter generated that file, didn't realize it's not actually supported.