feat: support Zod 4 (#777)

* Add Zod 4 support

* Format

* Add fallbacks

* Fix inference

* Bump lockfile dep

Author: colinhacks

README.md

@@ -68,7 +68,7 @@ Example:
 ```tsx
 import { useForm } from 'react-hook-form';
 import { zodResolver } from '@hookform/resolvers/zod';
-import { z } from 'zod';
+import { z } from 'zod'; // or 'zod/v4'
 
 const schema = z.object({
   id: z.number(),
@@ -175,7 +175,7 @@ const App = () => {
 };
 ```
 
-### [Zod](https://github.com/vriad/zod)
+### [Zod](https://github.com/colinhacks/zod)
 
 TypeScript-first schema validation with static type inference
 
@@ -186,7 +186,7 @@ TypeScript-first schema validation with static type inference
 ```tsx
 import { useForm } from 'react-hook-form';
 import { zodResolver } from '@hookform/resolvers/zod';
-import { z } from 'zod';
+import { z } from 'zod'; // or 'zod/v4'
 
 const schema = z.object({
   name: z.string().min(1, { message: 'Required' }),

bun.lock

@@ -54,7 +54,7 @@
         "vite-tsconfig-paths": "^5.1.4",
         "vitest": "^3.0.9",
         "yup": "^1.6.1",
-        "zod": "^3.24.2",
+        "zod": "^3.25.0",
       },
       "peerDependencies": {
         "react-hook-form": "^7.55.0",
@@ -1444,7 +1444,7 @@
 
     "yup": ["yup@1.6.1", "", { "dependencies": { "property-expr": "^2.0.5", "tiny-case": "^1.0.3", "toposort": "^2.0.2", "type-fest": "^2.19.0" } }, "sha512-JED8pB50qbA4FOkDol0bYF/p60qSEDQqBD0/qeIrUCG1KbPBIQ776fCUNb9ldbPcSTxA69g/47XTo4TqWiuXOA=="],
 
-    "zod": ["zod@3.24.2", "", {}, "sha512-lY7CDW43ECgW9u1TcT3IoXHflywfVqDYze4waEz812jR/bZ8FHDsl7pFQoSZTz5N+2NqRXs8GBwnAwo3ZNxqhQ=="],
+    "zod": ["zod@3.25.51", "", {}, "sha512-TQSnBldh+XSGL+opiSIq0575wvDPqu09AqWe1F7JhUMKY+M91/aGlK4MhpVNO7MgYfHcVCB1ffwAUTJzllKJqg=="],
 
     "@asamuzakjp/css-color/lru-cache": ["lru-cache@10.4.3", "", {}, "sha512-JNAzZcXrCt42VGLuYz0zfAzDfAvJWW6AfYlDBQyDV5DClI2m5sAmK+OIO7s59XfsRsWHp02jAJrRadPRGTt6SQ=="],
 

package.json

@@ -314,7 +314,7 @@
     "vite-tsconfig-paths": "^5.1.4",
     "vitest": "^3.0.9",
     "yup": "^1.6.1",
-    "zod": "^3.24.2"
+    "zod": "^3.25.0"
   },
   "peerDependencies": {
     "react-hook-form": "^7.55.0"

standard-schema/src/__tests__/__fixtures__/data.ts

@@ -1,6 +1,6 @@
 import { StandardSchemaV1 } from '@standard-schema/spec';
 import { Field, InternalFieldName } from 'react-hook-form';
-import { z } from 'zod';
+import { z } from 'zod/v3';
 
 export const schema = z
   .object({

standard-schema/src/__tests__/standard-schema.ts

@@ -1,5 +1,5 @@
 import { Resolver, SubmitHandler, useForm } from 'react-hook-form';
-import { z } from 'zod';
+import { z } from 'zod/v3';
 import { standardSchemaResolver } from '..';
 import {
   customSchema,

typebox/src/__tests__/typebox.ts

@@ -1,8 +1,8 @@
+import { Type } from '@sinclair/typebox';
+import { TypeCompiler } from '@sinclair/typebox/compiler';
 import { Resolver, SubmitHandler, useForm } from 'react-hook-form';
 import { typeboxResolver } from '..';
 import { fields, invalidData, schema, validData } from './__fixtures__/data';
-import { Type } from '@sinclair/typebox';
-import { TypeCompiler } from '@sinclair/typebox/compiler';
 
 const shouldUseNativeValidation = false;
 

typeschema/src/__tests__/Form-native-validation.tsx

@@ -3,7 +3,7 @@ import user from '@testing-library/user-event';
 import type { Infer } from '@typeschema/main';
 import React from 'react';
 import { useForm } from 'react-hook-form';
-import { z } from 'zod';
+import { z } from 'zod/v3';
 import { typeschemaResolver } from '..';
 
 const USERNAME_REQUIRED_MESSAGE = 'username field is required';

typeschema/src/__tests__/Form.tsx

@@ -3,7 +3,7 @@ import user from '@testing-library/user-event';
 import type { Infer } from '@typeschema/main';
 import React from 'react';
 import { useForm } from 'react-hook-form';
-import { z } from 'zod';
+import { z } from 'zod/v3';
 import { typeschemaResolver } from '..';
 
 const schema = z.object({

typeschema/src/__tests__/__fixtures__/data.ts

@@ -1,5 +1,5 @@
 import { Field, InternalFieldName } from 'react-hook-form';
-import { z } from 'zod';
+import { z } from 'zod/v3';
 
 export const schema = z
   .object({

typeschema/src/__tests__/typeschema.ts

@@ -1,6 +1,6 @@
 import * as typeschema from '@typeschema/main';
 import { Resolver, SubmitHandler, useForm } from 'react-hook-form';
-import { z } from 'zod';
+import { z } from 'zod/v3';
 import { typeschemaResolver } from '..';
 import { fields, invalidData, schema, validData } from './__fixtures__/data';
 

typeschema/src/typeschema.ts

@@ -1,12 +1,12 @@
 import { toNestErrors, validateFieldsNatively } from '@hookform/resolvers';
+import { StandardSchemaV1 } from '@standard-schema/spec';
 import {
   FieldError,
   FieldErrors,
   FieldValues,
   Resolver,
   appendErrors,
 } from 'react-hook-form';
-import { StandardSchemaV1 } from 'zod/lib/standard-schema';
 
 const parseErrorSchema = (
   typeschemaErrors: readonly StandardSchemaV1.Issue[],

zod/src/__tests__/Form-native-validation.tsx

@@ -2,7 +2,7 @@ import { render, screen } from '@testing-library/react';
 import user from '@testing-library/user-event';
 import React from 'react';
 import { useForm } from 'react-hook-form';
-import { z } from 'zod';
+import { z } from 'zod/v3';
 import { zodResolver } from '..';
 
 const USERNAME_REQUIRED_MESSAGE = 'username field is required';

zod/src/__tests__/Form.tsx

@@ -2,7 +2,7 @@ import { render, screen } from '@testing-library/react';
 import user from '@testing-library/user-event';
 import React from 'react';
 import { useForm } from 'react-hook-form';
-import { z } from 'zod';
+import { z } from 'zod/v3';
 import { zodResolver } from '..';
 
 const schema = z.object({

zod/src/__tests__/__fixtures__/data.ts renamed to zod/src/__tests__/__fixtures__/data-v3.ts

@@ -1,5 +1,5 @@
 import { Field, InternalFieldName } from 'react-hook-form';
-import { z } from 'zod';
+import { z } from 'zod/v3';
 
 export const schema = z
   .object({

zod/src/__tests__/__fixtures__/data-v4-mini.ts

@@ -0,0 +1,98 @@
+import { Field, InternalFieldName } from 'react-hook-form';
+import { z } from 'zod/v4-mini';
+
+export const schema = z
+  .object({
+    username: z
+      .string()
+      .check(z.regex(/^\w+$/), z.minLength(3), z.maxLength(30)),
+    password: z
+      .string()
+      .check(
+        z.regex(new RegExp('.*[A-Z].*'), 'One uppercase character'),
+        z.regex(new RegExp('.*[a-z].*'), 'One lowercase character'),
+        z.regex(new RegExp('.*\\d.*'), 'One number'),
+        z.regex(
+          new RegExp('.*[`~<>?,./!@#$%^&*()\\-_+="\'|{}\\[\\];:\\\\].*'),
+          'One special character',
+        ),
+        z.minLength(8, 'Must be at least 8 characters in length'),
+      ),
+    repeatPassword: z.string(),
+    accessToken: z.union([z.string(), z.number()]),
+    birthYear: z.optional(z.number().check(z.minimum(1900), z.maximum(2013))),
+    email: z.optional(z.email()),
+    tags: z.array(z.string()),
+    enabled: z.boolean(),
+    url: z.union([z.url('Custom error url'), z.literal('')]),
+    like: z.optional(
+      z.array(
+        z.object({
+          id: z.number(),
+          name: z.string().check(z.length(4)),
+        }),
+      ),
+    ),
+    dateStr: z
+      .pipe(
+        z.string(),
+        z.transform((value) => new Date(value)),
+      )
+      .check(
+        z.refine((value) => !isNaN(value.getTime()), {
+          message: 'Invalid date',
+        }),
+      ),
+  })
+  .check(
+    z.refine((obj) => obj.password === obj.repeatPassword, {
+      message: 'Passwords do not match',
+      path: ['confirm'],
+    }),
+  );
+
+export const validData = {
+  username: 'Doe',
+  password: 'Password123_',
+  repeatPassword: 'Password123_',
+  birthYear: 2000,
+  email: 'john@doe.com',
+  tags: ['tag1', 'tag2'],
+  enabled: true,
+  accessToken: 'accessToken',
+  url: 'https://react-hook-form.com/',
+  like: [
+    {
+      id: 1,
+      name: 'name',
+    },
+  ],
+  dateStr: '2020-01-01',
+} satisfies z.input<typeof schema>;
+
+export const invalidData = {
+  password: '___',
+  email: '',
+  birthYear: 'birthYear',
+  like: [{ id: 'z' }],
+  url: 'abc',
+} as unknown as z.input<typeof schema>;
+
+export const fields: Record<InternalFieldName, Field['_f']> = {
+  username: {
+    ref: { name: 'username' },
+    name: 'username',
+  },
+  password: {
+    ref: { name: 'password' },
+    name: 'password',
+  },
+  email: {
+    ref: { name: 'email' },
+    name: 'email',
+  },
+  birthday: {
+    ref: { name: 'birthday' },
+    name: 'birthday',
+  },
+};

zod/src/__tests__/__fixtures__/data-v4.ts

@@ -0,0 +1,89 @@
+import { Field, InternalFieldName } from 'react-hook-form';
+import { z } from 'zod/v4';
+
+export const schema = z
+  .object({
+    username: z.string().regex(/^\w+$/).min(3).max(30),
+    password: z
+      .string()
+      .regex(new RegExp('.*[A-Z].*'), 'One uppercase character')
+      .regex(new RegExp('.*[a-z].*'), 'One lowercase character')
+      .regex(new RegExp('.*\\d.*'), 'One number')
+      .regex(
+        new RegExp('.*[`~<>?,./!@#$%^&*()\\-_+="\'|{}\\[\\];:\\\\].*'),
+        'One special character',
+      )
+      .min(8, 'Must be at least 8 characters in length'),
+    repeatPassword: z.string(),
+    accessToken: z.union([z.string(), z.number()]),
+    birthYear: z.number().min(1900).max(2013).optional(),
+    email: z.string().email().optional(),
+    tags: z.array(z.string()),
+
+    enabled: z.boolean(),
+    url: z.string().url('Custom error url').or(z.literal('')),
+    like: z
+      .array(
+        z.object({
+          id: z.number(),
+          name: z.string().length(4),
+        }),
+      )
+      .optional(),
+    dateStr: z
+      .string()
+      .transform((value) => new Date(value))
+      .refine((value) => !isNaN(value.getTime()), {
+        message: 'Invalid date',
+      }),
+  })
+  .refine((obj) => obj.password === obj.repeatPassword, {
+    message: 'Passwords do not match',
+    path: ['confirm'],
+  });
+
+export const validData = {
+  username: 'Doe',
+  password: 'Password123_',
+  repeatPassword: 'Password123_',
+  birthYear: 2000,
+  email: 'john@doe.com',
+  tags: ['tag1', 'tag2'],
+  enabled: true,
+  accessToken: 'accessToken',
+  url: 'https://react-hook-form.com/',
+  like: [
+    {
+      id: 1,
+      name: 'name',
+    },
+  ],
+  dateStr: '2020-01-01',
+} satisfies z.input<typeof schema>;
+
+export const invalidData = {
+  password: '___',
+  email: '',
+  birthYear: 'birthYear',
+  like: [{ id: 'z' }],
+  url: 'abc',
+} as unknown as z.input<typeof schema>;
+
+export const fields: Record<InternalFieldName, Field['_f']> = {
+  username: {
+    ref: { name: 'username' },
+    name: 'username',
+  },
+  password: {
+    ref: { name: 'password' },
+    name: 'password',
+  },
+  email: {
+    ref: { name: 'email' },
+    name: 'email',
+  },
+  birthday: {
+    ref: { name: 'birthday' },
+    name: 'birthday',
+  },
+};