small fix in init_service_worker (#5417)

* Update render.js

fix: Replaced arrow function with anonymous function in the init_service_worker script for support old browsers

* Create ninety-dodos-exercise.md

* Update packages/kit/src/runtime/server/page/render.js

Co-authored-by: Rich Harris <hello@rich-harris.dev>

.changeset/ninety-dodos-exercise.md

@@ -0,0 +1,5 @@
+---
+"@sveltejs/kit": patch
+---
+
+Use anonymous function in service worker init script to support legacy browsers

packages/kit/src/runtime/server/page/render.js

@@ -188,9 +188,11 @@ export async function render_response({
 		});
 	`;
 
+	// we use an anonymous function instead of an arrow function to support
+	// older browsers (https://github.com/sveltejs/kit/pull/5417)
 	const init_service_worker = `
 		if ('serviceWorker' in navigator) {
-			addEventListener('load', () => {
+			addEventListener('load', function () {
 				navigator.serviceWorker.register('${options.service_worker}');
 			});
 		}