Support Standard Schema to validate Server Actions with ArkType, Valibot, Zod and Co.

[fabian-hiller]

Goals

1. Implement a schemaAction function based on Standard Schema (and optionally decode-formdata)
2. Improve DX by simplifying validation of server actions with various schema libraries

Non-Goals

No response

Background

A consortium of schema library authors have collaborated to craft a standard interface for schema libraries to benefit the entire JavaScript ecosystem. Standard Schema provides third-party libraries a uniform integration to automatically support multiple schema libraries at once, without adding a single runtime dependency. This simplifies implementation, prevents vendor lock-in, and enables innovation.

Repo: https://github.com/standard-schema/standard-schema

Proposal

'use server';

import { schemaAction } from 'next/navigation';
import * as v from 'valibot';

const schema = v.object({
  email: v.pipe(v.string(), v.email()),
  password: v.pipe(v.string(), v.minLength(8)),
});

export const loginUser = schemaAction(schema, async (data) => {
  // `data` is typed as `{ email: string, password: string }`
});