Question 1

How do I migrate TanStack Form to the createFormHook composition API?

Accepted Answer

Create shared contexts with createFormHookContexts, build bound field components using useFieldContext, wire them through createFormHook to get useAppForm and withForm, then convert each useForm call site to useAppForm and replace prop-drilled wrappers with form.AppField render props.

Question 2

How to share form sections across multiple TanStack Form forms?

Accepted Answer

Use withForm to wrap the shared section component, passing defaultValues for type inference and receiving the parent's typed form as a prop. This removes the need to thread an erased form type while keeping full type checking across the component boundary.

Question 3

Does createFormHook work with TanStack Form v0 or older versions?

Accepted Answer

No, createFormHook, createFormHookContexts, and withForm are stable in TanStack Form v1 and later. Check your package.json for @tanstack/react-form version 1+ before starting the migration.

Question 4

Why do type errors appear after removing the any-erased form type?

Accepted Answer

The erased type was hiding real bugs, commonly number fields whose handleChange receives null or mismatched types. Fix these by widening the bound component's useFieldContext union, such as string | number | null | undefined, rather than re-adding any.

Question 5

Can I migrate TanStack Form incrementally one form at a time?

Accepted Answer

Yes, the new composition infrastructure coexists with old prop-drilled wrappers, so you can convert one form end-to-end as a reference and keep the project compiling throughout. Migrate a simple form first, then fan out to complex ones.

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