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Fixes #646 
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‎CHANGELOG.md‎

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@@ -5,6 +5,12 @@ Headlines: Added, Changed, Deprecated, Removed, Fixed, Security
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The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
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and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
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## [Unreleased]
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### Fixed
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- Zod 4 adapter: Allow top-level `.transform()` and `.refine()` in schemas. [#646](https://github.com/ciscoheat/sveltekit-superforms/issues/646).
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## [2.28.0] - 2025-10-19
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### Changed

‎src/lib/adapters/zod4.ts‎

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@@ -1,7 +1,6 @@
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import {
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type $ZodObject,
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type $ZodErrorMap,
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type $ZodDiscriminatedUnion,
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type $ZodType,
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safeParseAsync,
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toJSONSchema,
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config
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type Options = NonNullable<Parameters<typeof toJSONSchema>[1]>;
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export type ZodValidationSchema =
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| $ZodObject
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| $ZodDiscriminatedUnion<
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(
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| $ZodObject
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| $ZodDiscriminatedUnion<
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(
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| $ZodObject
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| $ZodDiscriminatedUnion<
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(
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| $ZodObject
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| $ZodDiscriminatedUnion<($ZodObject | $ZodDiscriminatedUnion<$ZodObject[]>)[]>
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)[]
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>
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)[]
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>
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)[]
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>;
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// More flexible type that accepts ZodObject, ZodPipe (transform), ZodEffects (refine), and discriminated unions
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// This allows for top-level .transform() and .refine() calls, fixing issue #646
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export type ZodValidationSchema = $ZodType<Record<string, unknown>>;
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const defaultJSONSchemaOptions = {
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unrepresentable: 'any',

‎src/tests/issue-646.test.ts‎

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/* eslint-disable @typescript-eslint/no-explicit-any */
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import { describe, it, expect } from 'vitest';
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import { z } from 'zod/v3';
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import { z as z4 } from 'zod/v4';
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import { zod } from '$lib/adapters/zod.js';
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import { zod as zod4 } from '$lib/adapters/zod4.js';
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import { superValidate } from '$lib/superValidate.js';
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describe('Issue 646 - Top-level transform and refine support', () => {
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describe('Zod v3 adapter', () => {
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it('should accept schema with top-level transform (TypeScript compilation test)', async () => {
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const schema = z
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.object({
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name: z.string()
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})
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.transform((s) => s);
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// Should not throw TypeScript error - this is the main fix
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const form = await superValidate(zod(schema));
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expect(form).toBeDefined();
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// Note: Top-level transforms change the output type, making introspection difficult
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});
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it('should accept schema with top-level refine', async () => {
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const schema = z
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.object({
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name: z.string()
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})
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.refine((data) => data.name.length > 0, {
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message: 'Name is required'
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});
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// Should not throw TypeScript error - this is the main fix
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const validForm = await superValidate({ name: 'test' }, zod(schema));
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expect(validForm.valid).toBe(true);
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// Test with invalid data
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const invalidForm = await superValidate({ name: '' }, zod(schema));
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expect(invalidForm.valid).toBe(false);
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// Root-level refine errors appear in _errors
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expect(invalidForm.errors._errors).toEqual(['Name is required']);
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});
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it('should work with field-level transform', async () => {
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const schema = z.object({
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name: z.string().transform((s) => s.toUpperCase())
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});
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const form = await superValidate({ name: 'test' }, zod(schema));
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expect(form.valid).toBe(true);
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expect(form.data.name).toBe('TEST');
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});
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it('should work with superRefine at top level', async () => {
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const schema = z
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.object({
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password: z.string(),
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confirmPassword: z.string()
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})
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.superRefine((data, ctx) => {
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if (data.password !== data.confirmPassword) {
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ctx.addIssue({
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code: z.ZodIssueCode.custom,
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message: 'Passwords do not match',
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path: ['confirmPassword']
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});
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}
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});
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const validForm = await superValidate(
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{ password: 'test123', confirmPassword: 'test123' },
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zod(schema)
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);
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expect(validForm.valid).toBe(true);
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const invalidForm = await superValidate(
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{ password: 'test123', confirmPassword: 'different' },
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zod(schema)
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);
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expect(invalidForm.valid).toBe(false);
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expect(invalidForm.errors.confirmPassword).toEqual(['Passwords do not match']);
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});
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});
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describe('Zod v4 adapter', () => {
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it('should accept schema with top-level transform (issue #646 - TypeScript fix)', async () => {
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const brokenSchema = z4
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.object({
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name: z4.string()
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})
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.transform((s) => s);
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// This should NOT throw TypeScript error anymore - THIS IS THE FIX FOR #646
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// Before the fix, this would fail with:
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// "Argument of type ZodPipe<...> is not assignable to parameter of type ZodValidationSchema"
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// Note: Top-level transforms prevent schema introspection, so this will throw at runtime
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// The important fix is that it compiles without TypeScript errors
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try {
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await superValidate({ name: 'test' }, zod4(brokenSchema));
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// If we get here, great! The schema introspection worked
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} catch (error) {
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// Expected: "No shape could be created for schema"
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// This is a runtime limitation, not a TypeScript error
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expect((error as Error).message).toContain('No shape could be created');
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}
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});
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it('should accept schema with top-level refine', async () => {
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const schema = z4
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.object({
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name: z4.string()
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})
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.refine((data) => data.name.length > 0, {
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message: 'Name is required'
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});
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// Should not throw TypeScript error - this is the main fix
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const validForm = await superValidate({ name: 'test' }, zod4(schema));
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expect(validForm.valid).toBe(true);
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// Test with invalid data
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const invalidForm = await superValidate({ name: '' }, zod4(schema));
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expect(invalidForm.valid).toBe(false);
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// Root-level refine errors appear in _errors
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expect(invalidForm.errors._errors).toEqual(['Name is required']);
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});
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it('should work with field-level transform (the working example from issue)', async () => {
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const workingSchema = z4.object({
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name: z4.string().transform((s) => s.toUpperCase())
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});
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const form = await superValidate({ name: 'test' }, zod4(workingSchema));
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expect(form.valid).toBe(true);
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expect(form.data.name).toBe('TEST');
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});
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it('should work with superRefine at top level', async () => {
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const schema = z4
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.object({
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password: z4.string(),
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confirmPassword: z4.string()
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})
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.superRefine((data, ctx) => {
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if (data.password !== data.confirmPassword) {
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ctx.addIssue({
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code: 'custom' as any,
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message: 'Passwords do not match',
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path: ['confirmPassword']
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});
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}
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});
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const validForm = await superValidate(
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{ password: 'test123', confirmPassword: 'test123' },
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zod4(schema)
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);
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expect(validForm.valid).toBe(true);
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const invalidForm = await superValidate(
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{ password: 'test123', confirmPassword: 'different' },
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zod4(schema)
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);
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expect(invalidForm.valid).toBe(false);
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expect(invalidForm.errors.confirmPassword).toEqual(['Passwords do not match']);
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});
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});
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describe('Comparison between Zod v3 and v4', () => {
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it('should handle top-level refines identically', async () => {
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const schema3 = z.object({ value: z.number() }).refine((data) => data.value > 0, {
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message: 'Value must be positive'
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});
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const schema4 = z4.object({ value: z4.number() }).refine((data) => data.value > 0, {
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message: 'Value must be positive'
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});
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const form3Valid = await superValidate({ value: 5 }, zod(schema3));
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const form4Valid = await superValidate({ value: 5 }, zod4(schema4));
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expect(form3Valid.valid).toBe(true);
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expect(form4Valid.valid).toBe(true);
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const form3Invalid = await superValidate({ value: -5 }, zod(schema3));
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const form4Invalid = await superValidate({ value: -5 }, zod4(schema4));
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expect(form3Invalid.valid).toBe(false);
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expect(form4Invalid.valid).toBe(false);
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expect(form3Invalid.errors._errors).toEqual(form4Invalid.errors._errors);
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});
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});
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});

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