fix: simplify useForm return type (#1016)

* fix: simplify useForm return type

* ci: apply automated fixes and generate docs

* fix: restore validator type

* ci: apply automated fixes and generate docs

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

Author: Balastrong

Diff for: docs/framework/react/reference/functions/useform.md

@@ -6,7 +6,7 @@ title: useForm
 # Function: useForm()
 
 ```ts
-function useForm<TFormData, TFormValidator>(opts?): FormApi<TFormData, TFormValidator> & ReactFormApi<TFormData, TFormValidator>
+function useForm<TFormData, TFormValidator>(opts?): ReactFormExtendedApi<TFormData, TFormValidator>
 ```
 
 A custom React Hook that returns an extended instance of the `FormApi` class.
@@ -25,8 +25,8 @@ This API encapsulates all the necessary functionalities related to the form. It
 
 ## Returns
 
-`FormApi`\<`TFormData`, `TFormValidator`\> & [`ReactFormApi`](../interfaces/reactformapi.md)\<`TFormData`, `TFormValidator`\>
+[`ReactFormExtendedApi`](../type-aliases/reactformextendedapi.md)\<`TFormData`, `TFormValidator`\>
 
 ## Defined in
 
-[useForm.tsx:57](https://github.com/TanStack/form/blob/main/packages/react-form/src/useForm.tsx#L57)
+[useForm.tsx:65](https://github.com/TanStack/form/blob/main/packages/react-form/src/useForm.tsx#L65)

Diff for: docs/framework/react/reference/index.md

@@ -12,6 +12,7 @@ title: "@tanstack/react-form"
 ## Type Aliases
 
 - [FieldComponent](type-aliases/fieldcomponent.md)
+- [ReactFormExtendedApi](type-aliases/reactformextendedapi.md)
 - [UseField](type-aliases/usefield.md)
 
 ## Functions

Diff for: docs/framework/react/reference/type-aliases/reactformextendedapi.md

@@ -0,0 +1,22 @@
+---
+id: ReactFormExtendedApi
+title: ReactFormExtendedApi
+---
+
+# Type Alias: ReactFormExtendedApi\<TFormData, TFormValidator\>
+
+```ts
+type ReactFormExtendedApi<TFormData, TFormValidator>: FormApi<TFormData, TFormValidator> & ReactFormApi<TFormData, TFormValidator>;
+```
+
+An extended version of the `FormApi` class that includes React-specific functionalities from `ReactFormApi`
+
+## Type Parameters
+
+• **TFormData**
+
+• **TFormValidator** *extends* `Validator`\<`TFormData`, `unknown`\> \| `undefined` = `undefined`
+
+## Defined in
+
+[useForm.tsx:55](https://github.com/TanStack/form/blob/main/packages/react-form/src/useForm.tsx#L55)

Diff for: packages/react-form/src/index.ts

@@ -1,6 +1,6 @@
 export * from '@tanstack/form-core'
 
-export type { ReactFormApi } from './useForm'
+export type { ReactFormApi, ReactFormExtendedApi } from './useForm'
 export { useForm } from './useForm'
 
 export type { UseField, FieldComponent } from './useField'

Diff for: packages/react-form/src/useForm.tsx

@@ -49,6 +49,14 @@ export interface ReactFormApi<
   }) => NodeType
 }
 
+/**
+ * An extended version of the `FormApi` class that includes React-specific functionalities from `ReactFormApi`
+ */
+export type ReactFormExtendedApi<
+  TFormData,
+  TFormValidator extends Validator<TFormData, unknown> | undefined = undefined,
+> = FormApi<TFormData, TFormValidator> & ReactFormApi<TFormData, TFormValidator>
+
 /**
  * A custom React Hook that returns an extended instance of the `FormApi` class.
  *
@@ -61,23 +69,23 @@ export function useForm<
   const [formApi] = useState(() => {
     const api = new FormApi<TFormData, TFormValidator>(opts)
 
-    const extendedApi: typeof api & ReactFormApi<TFormData, TFormValidator> =
+    const extendedApi: ReactFormExtendedApi<TFormData, TFormValidator> =
       api as never
     extendedApi.Field = function APIField(props) {
-      return (<Field {...props} form={api} />) as never
+      return <Field {...props} form={api} />
     }
     // eslint-disable-next-line react-hooks/rules-of-hooks
     extendedApi.useField = (props) => useField({ ...props, form: api })
     extendedApi.useStore = (selector) => {
       // eslint-disable-next-line react-hooks/rules-of-hooks
-      return useStore(api.store as any, selector as any) as any
+      return useStore(api.store, selector)
     }
     extendedApi.Subscribe = (props) => {
       return functionalUpdate(
         props.children,
         // eslint-disable-next-line react-hooks/rules-of-hooks
-        useStore(api.store as any, props.selector as any),
-      ) as any
+        useStore(api.store, props.selector),
+      )
     }
 
     return extendedApi

Diff for: packages/react-form/tests/useForm.test-d.tsx

@@ -1,6 +1,6 @@
-import * as React from 'react'
 import { assertType, it } from 'vitest'
 import { useForm } from '../src/index'
+import type { ReactFormExtendedApi } from '../src/useForm'
 
 it('should type onSubmit properly', () => {
   function Comp() {
@@ -34,3 +34,20 @@ it('should type a validator properly', () => {
     })
   }
 })
+
+it('should not have recursion problems and type register properly', () => {
+  const register = <Data,>(f: ReactFormExtendedApi<Data>) => f
+
+  function Comp() {
+    const form = useForm({
+      defaultValues: {
+        name: '',
+        title: '',
+      },
+    })
+
+    const x = register(form)
+
+    return null
+  }
+})