Refactor getContext back to a simple context file

src/FormSpy.js

@@ -4,21 +4,15 @@ import renderComponent from './renderComponent'
 import type { FormSpyPropsWithForm as Props, FormSpyRenderProps } from './types'
 import type { FormApi, FormValuesShape } from 'final-form'
 import isSyntheticEvent from './isSyntheticEvent'
+import useForm from './useForm'
 import useFormState from './useFormState'
-import getContext from './getContext'
 
 function FormSpy<FormValues: FormValuesShape>({
   onChange,
   subscription,
   ...rest
 }: Props<FormValues>) {
-  const ReactFinalFormContext = getContext<FormValues>()
-  const reactFinalForm: ?FormApi<FormValues> = React.useContext(
-    ReactFinalFormContext
-  )
-  if (!reactFinalForm) {
-    throw new Error('FormSpy must be used inside of a ReactFinalForm component')
-  }
+  const reactFinalForm = useForm<FormValues>('FormSpy')
   const state = useFormState({ onChange, subscription })
   if (onChange) {
     return null

src/FormSpy.test.js

@@ -31,7 +31,7 @@ describe('FormSpy', () => {
     expect(errorSpy).toHaveBeenCalled()
     expect(errorSpy).toHaveBeenCalledTimes(1)
     expect(errorSpy.mock.calls[0][0].message).toBe(
-      'FormSpy must be used inside of a ReactFinalForm component'
+      'FormSpy must be used inside of a <Form> component'
     )
     console.error.mockRestore()
   })

src/ReactFinalForm.js

@@ -20,7 +20,7 @@ import useConstant from './useConstant'
 import shallowEqual from './shallowEqual'
 import isSyntheticEvent from './isSyntheticEvent'
 import type { FormRenderProps } from './types.js.flow'
-import getContext from './getContext'
+import ReactFinalFormContext from './context'
 import useLatest from './useLatest'
 
 export const version = '6.1.0'
@@ -53,7 +53,6 @@ function ReactFinalForm<FormValues: FormValuesShape>({
   validateOnBlur,
   ...rest
 }: Props<FormValues>) {
-  const ReactFinalFormContext = getContext<FormValues>()
   const config: Config<FormValues> = {
     debug,
     destroyOnUnregister,

src/context.js

@@ -0,0 +1,5 @@
+// @flow
+import * as React from 'react'
+import type { FormApi } from 'final-form'
+
+export default React.createContext<?FormApi<any>>()

src/useForm.js

@@ -1,12 +1,11 @@
 // @flow
 import * as React from 'react'
 import type { FormApi, FormValuesShape } from 'final-form'
-import getContext from './getContext'
+import ReactFinalFormContext from './context'
 
 function useForm<FormValues: FormValuesShape>(
   componentName?: string
 ): FormApi<FormValues> {
-  const ReactFinalFormContext = getContext<FormValues>()
   const form: ?FormApi<FormValues> = React.useContext(ReactFinalFormContext)
   if (!form) {
     throw new Error(