Expose method of subscribing to form data

Feature request: I would like to be able to subscribe to form updates for the purpose of autosave without submission. I am currently using FormSpy to do this but its render function is also triggered by parents rerendering:

<FormSpy subscription={{ values: true }}>
   {({ values }) => {
     onChange(values);
     return null;
   }}
</FormSpy>

It would nice if there was easy way to listen to updates without it also trigging on renders and gives the granularity subscriptions offer (debug is too noisy). I could get hold of reactFinalForm from context but this in not part of the public API.

One of the following would work for me:

• An onChange prop on FormSpy
• A simular component that accepts subcription and onChange as props
• A component that fetches reactFinalForm from the context
• reactFinalForm being exposed as a render prop on Form

Am I missing something, is there already a way to do this?

[erikras]

Published fix in v1.2.0.

[lock[bot]]

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