sveltejs · teemingc · Jul 31, 2026 · Jul 31, 2026 · Jul 31, 2026 · Jul 31, 2026
diff --git a/.github/workflows/platform-tests-vercel.yml b/.github/workflows/platform-tests-vercel.yml
@@ -44,3 +44,26 @@ jobs:
         with:
           test-app-dir: packages/adapter-vercel/test/apps/basic
           deployment-url: ${{ steps.deploy.outputs.deployment-url }}
+
+  test-split:
+    if: github.repository == 'sveltejs/kit'
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    environment: '@sveltejs/adapter-vercel platform tests'
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          ref: ${{ inputs.sha || github.sha }}
+          persist-credentials: false
+
+      - uses: ./.github/actions/vercel-deploy
+        id: deploy
+        with:
+          vercel-project-id: ${{ secrets.VERCEL_PROJECT_ID_SPLIT }}
+          vercel-token: ${{ secrets.VERCEL_TOKEN }}
+          vercel-org-id: ${{ secrets.VERCEL_ORG_ID }}
+
+      - uses: ./.github/actions/platform-test
+        with:
+          test-app-dir: packages/adapter-vercel/test/apps/split
+          deployment-url: ${{ steps.deploy.outputs.deployment-url }}
diff --git a/packages/adapter-vercel/test/apps/basic/tsconfig.json b/packages/adapter-vercel/test/apps/basic/tsconfig.json
@@ -10,5 +10,6 @@
 		"skipLibCheck": true,
 		"sourceMap": true,
 		"moduleResolution": "bundler"
-	}
+	},
+	"include": ["src", "test", "playwright.config.js", "vite.config.ts"]
 }
diff --git a/packages/adapter-vercel/test/apps/split/package.json b/packages/adapter-vercel/test/apps/split/package.json
@@ -0,0 +1,20 @@
+{
+	"name": "test-vercel-split",
+	"version": "0.0.1",
+	"private": true,
+	"scripts": {
+		"dev": "vite dev",
+		"preview": "vite preview",
+		"build": "vite build",
+		"prepare": "svelte-kit sync || echo ''",
+		"test:platform": "playwright test"
+	},
+	"devDependencies": {
+		"@sveltejs/kit": "workspace:*",
+		"@sveltejs/vite-plugin-svelte": "catalog:",
+		"svelte": "catalog:",
+		"typescript": "catalog:",
+		"vite": "catalog:"
+	},
+	"type": "module"
+}
diff --git a/packages/adapter-vercel/test/apps/split/playwright.config.js b/packages/adapter-vercel/test/apps/split/playwright.config.js
@@ -0,0 +1 @@
+export { config as default } from '../../utils.js';
diff --git a/packages/adapter-vercel/test/apps/split/src/app.d.ts b/packages/adapter-vercel/test/apps/split/src/app.d.ts
@@ -0,0 +1,13 @@
+// See https://svelte.dev/docs/kit/types#app.d.ts
+// for information about these interfaces
+declare global {
+	namespace App {
+		// interface Error {}
+		// interface Locals {}
+		// interface PageData {}
+		// interface PageState {}
+		// interface Platform {}
+	}
+}
+
+export {};
diff --git a/packages/adapter-vercel/test/apps/split/src/app.html b/packages/adapter-vercel/test/apps/split/src/app.html
@@ -0,0 +1,11 @@
+<!doctype html>
+<html lang="en">
+	<head>
+		<meta charset="utf-8" />
+		<meta name="viewport" content="width=device-width, initial-scale=1" />
+		%sveltekit.head%
+	</head>
+	<body data-sveltekit-preload-data="hover">
+		<div style="display: contents">%sveltekit.body%</div>
+	</body>
+</html>
diff --git a/packages/adapter-vercel/test/apps/split/src/routes/+layout.svelte b/packages/adapter-vercel/test/apps/split/src/routes/+layout.svelte
@@ -0,0 +1,5 @@
+<script lang="ts">
+	let { children } = $props();
+</script>
+
+{@render children()}
diff --git a/packages/adapter-vercel/test/apps/split/src/routes/+page.svelte b/packages/adapter-vercel/test/apps/split/src/routes/+page.svelte
@@ -0,0 +1,5 @@
+<h1>Hello from SvelteKit on Vercel</h1>
+
+<nav>
+	<a href="/a">go to route a</a>
+</nav>
diff --git a/packages/adapter-vercel/test/apps/split/src/routes/a/+page.svelte b/packages/adapter-vercel/test/apps/split/src/routes/a/+page.svelte
@@ -0,0 +1 @@
+<p>This route will be served by a different function because we use the split config</p>
diff --git a/packages/adapter-vercel/test/apps/split/test/test.ts b/packages/adapter-vercel/test/apps/split/test/test.ts
@@ -0,0 +1,8 @@
+import { expect, test } from '@playwright/test';
+
+test('split functions work', async ({ page }) => {
+	await page.goto('/');
+	await expect(page.locator('h1')).toContainText('Hello from SvelteKit on Vercel');
+	await page.goto('/a');
+	await expect(page.locator('p')).toContainText(/split config/);
+});
diff --git a/packages/adapter-vercel/test/apps/split/tsconfig.json b/packages/adapter-vercel/test/apps/split/tsconfig.json
@@ -0,0 +1,15 @@
+{
+	"extends": "$app/tsconfig",
+	"compilerOptions": {
+		"rewriteRelativeImportExtensions": true,
+		"allowJs": true,
+		"checkJs": true,
+		"esModuleInterop": true,
+		"forceConsistentCasingInFileNames": true,
+		"resolveJsonModule": true,
+		"skipLibCheck": true,
+		"sourceMap": true,
+		"moduleResolution": "bundler"
+	},
+	"include": ["src", "test", "playwright.config.js", "vite.config.ts"]
+}
diff --git a/packages/adapter-vercel/test/apps/split/vite.config.ts b/packages/adapter-vercel/test/apps/split/vite.config.ts
@@ -0,0 +1,13 @@
+import { sveltekit } from '@sveltejs/kit/vite';
+import { defineConfig } from 'vite';
+import adapter from '../../../index.js';
+
+export default defineConfig({
+	plugins: [
+		sveltekit({
+			adapter: adapter({
+				split: true
+			})
+		})
+	]
+});
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		export { config as default } from '../../utils.js';
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		<p>This route will be served by a different function because we use the split config</p>