Breaking TypeScript changes in v7.0.0 (and final-form v5.0.0)

[PhilMeyr]

Hi @erikras,

First, thank you for maintaining this library and for the Flow → TypeScript migration! 🙏

The release notes for v7.0.0 state "There should be NO BREAKING CHANGES", but we encountered several TypeScript breaking changes during our migration from v6.5.7 to v7.0.0.

Here's a comprehensive list:

react-final-form v7.0.0

Change	Impact	Fix
FormState.values can now be undefined	All usages of values.property fail	Use values?.property or values ?? {}
FormState.dirty, pristine, valid, etc. can be undefined	Boolean checks fail (e.g., dirty && ...)	Use dirty ?? false
FieldMetaState type is no longer exported	Import fails	Use FieldRenderProps<T>['meta'] instead
AnyObject type is no longer exported	Import fails	Define locally: type AnyObject = Record<string, any>
UseFieldConfig is no longer generic	UseFieldConfig<T> fails	Use UseFieldConfig (no generic)
FormProps no longer accepts arbitrary props like style	<Form style={...}> fails	Wrap with a <div style={...}>

final-form v5.0.0

Change	Impact	Fix
InternalFormState now requires asyncErrors property	Test mocks fail	Add asyncErrors: {} to mock objects
Mutator type signature changed	Jest mocks incompatible	Cast with as unknown as Mutator

Migration effort

For our medium-sized codebase, we had to modify 170+ files. The changes are straightforward but numerous.

Suggestion

It would be helpful to either:

1. Document these TypeScript changes in the release notes
2. Or add a migration guide for TypeScript users

---

Environment:

• react-final-form: 6.5.7 → 7.0.0
• final-form: 4.20.4 → 5.0.0
• TypeScript: 5.5.4