Fixed flow FormSpy problem (#377)

Author: erikras

src/FormSpy.js

@@ -3,7 +3,7 @@ import * as React from 'react'
 import { formSubscriptionItems } from 'final-form'
 import diffSubscription from './diffSubscription'
 import renderComponent from './renderComponent'
-import type { FormSpyProps as Props, FormSpyRenderProps } from './types'
+import type { FormSpyPropsWithForm as Props, FormSpyRenderProps } from './types'
 import type { FormState } from 'final-form'
 import isSyntheticEvent from './isSyntheticEvent'
 import { all } from './ReactFinalForm'

src/types.js.flow

@@ -98,7 +98,10 @@ export type FieldPropsWithForm = {
 } & FieldProps
 
 export type FormSpyProps = {
-  reactFinalForm: FormApi,
   onChange?: (formState: FormState) => void,
   subscription?: FormSubscription
 } & RenderableProps<FormSpyRenderProps>
+
+export type FormSpyPropsWithForm = {
+  reactFinalForm: FormApi
+} & FormSpyProps