diff --git a/.changeset/polite-ducks-notice.md b/.changeset/polite-ducks-notice.md
new file mode 100644
index 000000000000..8aa096da4878
--- /dev/null
+++ b/.changeset/polite-ducks-notice.md
@@ -0,0 +1,9 @@
+---
+'@sveltejs/adapter-cloudflare-workers': patch
+'@sveltejs/adapter-netlify': patch
+'@sveltejs/adapter-node': patch
+'@sveltejs/adapter-vercel': patch
+'@sveltejs/kit': patch
+---
+
+Externalize app initialization to adapters
diff --git a/packages/adapter-cloudflare-workers/files/entry.js b/packages/adapter-cloudflare-workers/files/entry.js
index d5749d7f83cb..1c7db17461fe 100644
--- a/packages/adapter-cloudflare-workers/files/entry.js
+++ b/packages/adapter-cloudflare-workers/files/entry.js
@@ -1,7 +1,8 @@
 // TODO hardcoding the relative location makes this brittle
-import { render } from '../output/server/app.js'; // eslint-disable-line import/no-unresolved
+import { init, render } from '../output/server/app.js'; // eslint-disable-line import/no-unresolved
 import { getAssetFromKV, NotFoundError } from '@cloudflare/kv-asset-handler'; // eslint-disable-line import/no-unresolved
 
+init();
 addEventListener('fetch', (event) => {
 	event.respondWith(handle(event));
 });
diff --git a/packages/adapter-netlify/files/entry.js b/packages/adapter-netlify/files/entry.js
index c230c41d488a..482d0cb2b055 100644
--- a/packages/adapter-netlify/files/entry.js
+++ b/packages/adapter-netlify/files/entry.js
@@ -1,8 +1,9 @@
 import '@sveltejs/kit/install-fetch'; // eslint-disable-line import/no-unresolved
 
 // TODO hardcoding the relative location makes this brittle
-import { render } from '../output/server/app.js'; // eslint-disable-line import/no-unresolved
+import { init, render } from '../output/server/app.js'; // eslint-disable-line import/no-unresolved
 
+init();
 export async function handler(event) {
 	const { path, httpMethod, headers, rawQuery, body, isBase64Encoded } = event;
 
diff --git a/packages/adapter-node/src/index.js b/packages/adapter-node/src/index.js
index 6914d4828e70..a1b45947c449 100644
--- a/packages/adapter-node/src/index.js
+++ b/packages/adapter-node/src/index.js
@@ -1,9 +1,10 @@
 import './require_shim';
 import { createServer } from './server';
 // TODO hardcoding the relative location makes this brittle
-import { render } from '../output/server/app.js'; // eslint-disable-line import/no-unresolved
+import { init, render } from '../output/server/app.js'; // eslint-disable-line import/no-unresolved
 import { host, port } from './env.js'; // eslint-disable-line import/no-unresolved
 
+init();
 const instance = createServer({ render }).listen(port, host, () => {
 	console.log(`Listening on port ${port}`);
 });
diff --git a/packages/adapter-node/src/require_shim.js b/packages/adapter-node/src/require_shim.js
index f335a1e3bde0..2aa5259586f1 100644
--- a/packages/adapter-node/src/require_shim.js
+++ b/packages/adapter-node/src/require_shim.js
@@ -1,2 +1,2 @@
 import { createRequire } from 'module';
-global.require = createRequire(import.meta.url);
+globalThis.require = createRequire(import.meta.url);
diff --git a/packages/adapter-vercel/files/entry.js b/packages/adapter-vercel/files/entry.js
index 4fa041c47fee..b7733bfa1858 100644
--- a/packages/adapter-vercel/files/entry.js
+++ b/packages/adapter-vercel/files/entry.js
@@ -2,8 +2,9 @@ import { getRawBody } from '@sveltejs/kit/node'; // eslint-disable-line import/n
 import '@sveltejs/kit/install-fetch'; // eslint-disable-line import/no-unresolved
 
 // TODO hardcoding the relative location makes this brittle
-import { render } from '../output/server/app.js'; // eslint-disable-line import/no-unresolved
+import { init, render } from '../output/server/app.js'; // eslint-disable-line import/no-unresolved
 
+init();
 export default async (req, res) => {
 	const { pathname, searchParams } = new URL(req.url || '', 'http://localhost');
 
diff --git a/packages/kit/src/core/build/index.js b/packages/kit/src/core/build/index.js
index a89c485703fe..b89a38fdd6b7 100644
--- a/packages/kit/src/core/build/index.js
+++ b/packages/kit/src/core/build/index.js
@@ -285,9 +285,11 @@ async function build_server(
 
 			let options = null;
 
+			const default_settings = { paths: ${s(config.kit.paths)} };
+
 			// allow paths to be overridden in svelte-kit preview
 			// and in prerendering
-			export function init(settings) {
+			export function init(settings = default_settings) {
 				set_paths(settings.paths);
 				set_prerendering(settings.prerendering || false);
 
@@ -380,8 +382,6 @@ async function build_server(
 				};
 			}
 
-			init({ paths: ${s(config.kit.paths)} });
-
 			export function render(request, {
 				prerender
 			} = {}) {
diff --git a/packages/kit/src/install-fetch.js b/packages/kit/src/install-fetch.js
index d0271ba0000e..af1df512ea76 100644
--- a/packages/kit/src/install-fetch.js
+++ b/packages/kit/src/install-fetch.js
@@ -1,7 +1,20 @@
-// @ts-nocheck
 import fetch, { Response, Request, Headers } from 'node-fetch';
 
-globalThis.fetch = fetch;
-globalThis.Response = Response;
-globalThis.Request = Request;
-globalThis.Headers = Headers;
+Object.defineProperties(globalThis, {
+    fetch: {
+        enumerable: true,
+        value: fetch
+    },
+    Response: {
+        enumerable: true,
+        value: Response
+    },
+    Request: {
+        enumerable: true,
+        value: Request
+    },
+    Headers: {
+        enumerable: true,
+        value: Headers
+    }
+});