Latest react-native 0.79.2 & Expo version errors makes tanstack form unusable

[fendyk]

Describe the bug

When doing something simple as using the form.Field, I receive the following error:

right operand of 'instanceof' is not an object

Code (check repo for more info):

const form = useForm({
  defaultValues: {
    firstName: "John",
    lastName: "Doe",
  },
  onSubmit: async ({ value }) => {
    // Do something with form data
    console.log(value);
  },
});

<form.Field
    name={"firstName"}
    children={(field) => (
        <View>
          <Text className={"bg-red-500 text-2xl"}>{field.state.value}</Text>
        </View>
    )}
/>

Your minimal, reproducible example

https://github.com/fendyk/RN-Expo-Tanstack-Form-Example.git

Steps to reproduce

Clone the following repo: https://github.com/fendyk/RN-Expo-Tanstack-Form-Example.git

install deps, and then run bun run android

Expected behavior

It should work as intended

How often does this bug happen?

Every time

Screenshots or Videos

Platform

Android & iOS (React native)

TanStack Form adapter

None

TanStack Form version

1.11.3 or greater

TypeScript version

5.8.3 or greater

Additional context

No response

[jrhager84]

I believe it is related to this issue:

https://github.com/TanStack/form/issues/1501#issuecomment-2919178134

[crutchcorn]

Almost certainly a dupe of #1501