Final Form subscribe

React chapter 63 · React Final Form · subscription · source: final-form/react-final-form/src/Field.js

The problem

The form is an observer store, but every Field still listens to the whole state. Typing a value notifies a component that only cares whether the form is pristine. You paid for a subscription API and then subscribed to "*".

The pattern that fixes it

Field subscription={{ value: true }} or {{ error: true }} or {{ pristine: true }}. The decorator is explicit. final-form is a vanilla observer; react-final-form is the thin React adapter — same split as Zustand vanilla vs React.

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