fix: fields.value() initial data missing

Author: sillvva

.changeset/olive-icons-jump.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: `fields.value()` initial data missing

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

@@ -197,24 +197,22 @@ export function form(validate_or_fn, maybe_fn) {
 
 		Object.defineProperty(instance, 'fields', {
 			get() {
-				const data = get_cache(__)?.[''];
-				const issues = flatten_issues(data?.issues ?? []);
-
 				return create_field_proxy(
 					{},
-					() => data?.input ?? {},
+					() => (get_cache(__)[''] ?? {}).input ?? {},
 					(path, value) => {
-						if (data?.submission) {
+						const data = (get_cache(__)[''] ??= {});
+						if (data.submission) {
 							// don't override a submission
 							return;
 						}
 
 						const input =
-							path.length === 0 ? value : deep_set(data?.input ?? {}, path.map(String), value);
+							path.length === 0 ? value : deep_set(data.input ?? {}, path.map(String), value);
 
-						(get_cache(__)[''] ??= {}).input = input;
+						data.input = input;
 					},
-					() => issues
+					() => flatten_issues((get_cache(__)[''] ?? {}).issues ?? [])
 				);
 			}
 		});

packages/kit/test/apps/basics/src/routes/remote/form/initial-value/+page.svelte

@@ -0,0 +1,11 @@
+<script>
+	import { values } from './value.remote.js';
+	const fields = values.fields;
+	const initial_value = $state({ val: 'initial' });
+	fields.set(initial_value);
+</script>
+
+<h1>Remote Form Initial Value Test</h1>
+
+<pre id="initial">Initial: {JSON.stringify(initial_value)}</pre>
+<pre id="value">Value: {JSON.stringify(fields.value())}</pre>

packages/kit/test/apps/basics/src/routes/remote/form/initial-value/+page.ts

@@ -0,0 +1 @@
+export const csr = false;

packages/kit/test/apps/basics/src/routes/remote/form/initial-value/value.remote.ts

@@ -0,0 +1,11 @@
+import { form } from '$app/server';
+import * as v from 'valibot';
+
+export const values = form(
+	v.object({
+		val: v.string()
+	}),
+	async (data) => {
+		return { success: true, data };
+	}
+);

packages/kit/test/apps/basics/test/test.js

@@ -1818,6 +1818,15 @@ test.describe('remote functions', () => {
 		);
 	});
 
+	test('form initial value works', async ({ page, javaScriptEnabled }) => {
+		if (javaScriptEnabled) return;
+
+		await page.goto('/remote/form/initial-value');
+
+		await expect(page.locator('#initial')).toHaveText('Initial: {"val":"initial"}');
+		await expect(page.locator('#value')).toHaveText('Value: {"val":"initial"}');
+	});
+
 	test('form preflight works', async ({ page, javaScriptEnabled }) => {
 		if (!javaScriptEnabled) return;