fix: only apply some polyfills below node 18.11 (#10920)

* fix: only apply some polyfills below node 18.11

related to #10918

* Update packages/kit/src/exports/node/polyfills.js

Co-authored-by: Ben McCann <[email protected]>

* be more defensive

* be more defensive

---------

Co-authored-by: Rich Harris <[email protected]>
Co-authored-by: Ben McCann <[email protected]>

Author: 3 people

.changeset/mean-cheetahs-tell.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: only apply some polyfills below node 18.11

packages/kit/src/exports/node/polyfills.js

@@ -3,11 +3,17 @@ import buffer from 'node:buffer';
 import { webcrypto as crypto } from 'node:crypto';
 import { fetch, Response, Request, Headers, FormData, File as UndiciFile } from 'undici';
 
+/** @type {Record<string, any>} */
+const globals_post_node_18_11 = {
+	crypto
+};
+
 // @ts-expect-error
 const File = buffer.File ?? UndiciFile;
 
 /** @type {Record<string, any>} */
-const globals = {
+// TODO: remove this once we only support Node 18.11+ (the version multipart/form-data was added)
+const globals_pre_node_18_11 = {
 	crypto,
 	fetch,
 	Response,
@@ -21,16 +27,26 @@ const globals = {
 };
 
 // exported for dev/preview and node environments
-// TODO: remove this once we only support Node 18.11+ (the version multipart/form-data was added)
 /**
  * Make various web APIs available as globals:
  * - `crypto`
- * - `fetch`
- * - `Headers`
- * - `Request`
- * - `Response`
+ * - `fetch` (only in node < 18.11)
+ * - `Headers` (only in node < 18.11)
+ * - `Request` (only in node < 18.11)
+ * - `Response` (only in node < 18.11)
  */
 export function installPolyfills() {
+	// Be defensive (we don't know in which environments this is called) and always apply if something goes wrong
+	let globals = globals_pre_node_18_11;
+	try {
+		const version = process.versions.node.split('.').map((n) => parseInt(n, 10));
+		if ((version[0] === 18 && version[1] >= 11) || version[0] > 18) {
+			globals = globals_post_node_18_11;
+		}
+	} catch (e) {
+		// ignore
+	}
+
 	for (const name in globals) {
 		Object.defineProperty(globalThis, name, {
 			enumerable: true,