Adding vercel adapter.

package.json

@@ -17,6 +17,7 @@
     "@playwright/test": "^1.23.2",
     "@rgossiaux/svelte-headlessui": "1.0.2",
     "@sveltejs/adapter-auto": "next",
+    "@sveltejs/adapter-vercel": "next",
     "@sveltejs/kit": "next",
     "@types/cookie": "^0.5.1",
     "@types/node": "^17.0.45",

pnpm-lock.yaml

@@ -6,6 +6,7 @@ specifiers:
   '@playwright/test': ^1.23.2
   '@rgossiaux/svelte-headlessui': 1.0.2
   '@sveltejs/adapter-auto': next
+  '@sveltejs/adapter-vercel': next
   '@sveltejs/kit': next
   '@types/cookie': ^0.5.1
   '@types/node': ^17.0.45
@@ -38,6 +39,7 @@ devDependencies:
   '@playwright/test': 1.23.2
   '@rgossiaux/svelte-headlessui': 1.0.2_svelte@3.49.0
   '@sveltejs/adapter-auto': 1.0.0-next.54
+  '@sveltejs/adapter-vercel': 1.0.0-next.59
   '@sveltejs/kit': 1.0.0-next.360_svelte@3.49.0+vite@2.9.13
   '@types/cookie': 0.5.1
   '@types/node': 17.0.45

svelte.config.js

@@ -1,4 +1,4 @@
-import adapter from '@sveltejs/adapter-auto';
+import vercel from '@sveltejs/adapter-vercel';
 import preprocess from 'svelte-preprocess';
 
 /** @type {import('@sveltejs/kit').Config} */
@@ -7,7 +7,20 @@ const config = {
   // for more information about preprocessors
   preprocess: preprocess(),
   kit: {
-    adapter: adapter(),
+    adapter: vercel({
+      // if true, will deploy the app using edge functions
+      // (https://vercel.com/docs/concepts/functions/edge-functions)
+      // rather than serverless functions
+      edge: false,
+
+      // an array of dependencies that esbuild should treat
+      // as external when bundling functions
+      external: [],
+
+      // if true, will split your app into multiple functions
+      // instead of creating a single one for the entire app
+      split: false
+    }),
     alias: {
       $components: 'src/components',
       $root: './src'