Remote forms: incorrect typing for form.fields.value() and form.fields.<fieldname>.value() #14835
Description
Describe the bug
The return values of form.fields.value() and form.fields.<fieldname>.value() are typed according to the schema used when defining the remote function.
However, this does not reflect runtime reality. The return value of form.fields.value() is an empty object until the user either interacts with the associated form input or values are set programmatically using form.fields.set(). Likewise, form.fields.<filedname>.value() returns undefined initially.
Reproduction
Full working reproduction: https://github.com/siim-m/sk-remote-form-type-issue
// src/lib/forms.remote.ts
import { form } from '$app/server';
import * as z from 'zod';
export const myForm = form(
z.object({
someString: z.string(),
}),
async (input) => {
console.log('input', input);
}
);<script lang="ts">
// src/routes/+page.svelte
import { myForm } from '$lib/forms.remote';
// Until the user enters anything in the input, TypeScript types don't reflect runtime reality:
// - `values` is typed as `{ someString: string }` but is an empty object
// - `someString` is typed as `string` but is `undefined` at runtime
const values = $derived(myForm.fields.value());
const someString = $derived(myForm.fields.someString.value());
</script>
<form {...myForm}>
<input {...myForm.fields.someString.as('text')} />
</form>
<p>values:</p>
<pre>{JSON.stringify(values, null, 2)}</pre>
<hr />
<p>typeof someString:</p>
<pre>{typeof someString}</pre>
Logs
(nothing printed to console)System Info
System:
OS: Linux 6.8 Ubuntu 24.04.3 LTS 24.04.3 LTS (Noble Numbat)
CPU: (8) x64 QEMU Virtual CPU version 2.5+
Memory: 42.96 GB / 62.66 GB
Container: Yes
Shell: 5.9 - /bin/zsh
Binaries:
Node: 22.19.0 - /home/siim/.config/nvm/versions/node/v22.19.0/bin/node
npm: 11.6.0 - /home/siim/.config/nvm/versions/node/v22.19.0/bin/npm
bun: 1.3.0 - /home/siim/.bun/bin/bun
npmPackages:
@sveltejs/adapter-auto: ^6.1.0 => 6.1.1
@sveltejs/kit: 2.48.2 => 2.48.2
@sveltejs/vite-plugin-svelte: ^6.2.0 => 6.2.1
svelte: 5.40.2 => 5.40.2
vite: ^7.1.7 => 7.1.12Severity
annoyance
Additional Information
No response