fix: render remote form actions on prerendered pages

.changeset/calm-forms-prerender.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: render remote form actions while prerendering

packages/kit/src/runtime/app/server/remote/form.js

@@ -156,7 +156,8 @@ export function form(validate_or_fn, maybe_fn) {
 
 		Object.defineProperty(instance, 'action', {
 			get: () => {
-				const search = new URLSearchParams(get_request_store().event.url.search);
+				const { event, state } = get_request_store();
+				const search = new URLSearchParams(state.prerendering ? '' : event.url.search);
 				search.delete('/remote');
 
 				const query = search.toString();

packages/kit/test/apps/async/src/routes/remote/prerender/prerender.remote.js

@@ -1,5 +1,5 @@
 import { building, dev } from '$app/env';
-import { prerender, read } from '$app/server';
+import { form, prerender, read } from '$app/server';
 import text from './test.txt?url';
 
 // test that using `read()` at the top-level of a remote function file doesn't
@@ -33,3 +33,5 @@ export const prerendered_entries = prerender(
 export const with_read = prerender(() => {
 	return content;
 });
+
+export const prerendered_form = form(() => {});

packages/kit/test/apps/async/src/routes/remote/prerender/whole-page/+page.svelte

@@ -1,4 +1,6 @@
 <script>
+	import { prerendered_form } from '../prerender.remote.js';
+
 	let { data } = $props();
 </script>
 
@@ -8,3 +10,7 @@
 	{data.r3}
 	{data.r4}
 </p>
+
+<form data-prerendered {...prerendered_form}>
+	<button>submit</button>
+</form>

packages/kit/test/apps/async/test/test.js

@@ -811,6 +811,7 @@ test.describe('remote functions', () => {
 		await page.goto('/remote/prerender');
 		await clicknav('[href="/remote/prerender/whole-page"]');
 		await expect(page.locator('#prerendered-data')).toHaveText('a c 中文 yes');
+		await expect(page.locator('[data-prerendered]')).toHaveAttribute('action', /^\?\/remote=/);
 
 		await page.goto('/remote/prerender');
 		await clicknav('[href="/remote/prerender/functions-only"]');