expose __unsafe_useEmotionCache from @emotion/react

.changeset/forty-pumas-refuse.md

@@ -0,0 +1,5 @@
+---
+'@emotion/react': patch
+---
+
+expose \_\_unsafe_useEmotionCache from @emotion/react, see https://github.com/emotion-js/emotion/pull/2441

packages/react/src/context.js

@@ -20,6 +20,11 @@ let EmotionCacheContext: React.Context<EmotionCache | null> =
 
 export let CacheProvider = EmotionCacheContext.Provider
 
+export let __unsafe_useEmotionCache =
+  function useEmotionCache(): EmotionCache | null {
+    return useContext(EmotionCacheContext)
+  }
+
 let withEmotionCache = function withEmotionCache<Props, Ref: React.Ref<*>>(
   func: (props: Props, cache: EmotionCache, ref: Ref) => React.Node
 ): React.AbstractComponent<Props> {

packages/react/src/index.js

@@ -1,7 +1,11 @@
 // @flow
 import pkg from '../package.json'
 export type { SerializedStyles } from '@emotion/utils'
-export { withEmotionCache, CacheProvider } from './context'
+export {
+  withEmotionCache,
+  CacheProvider,
+  __unsafe_useEmotionCache
+} from './context'
 export { jsx } from './jsx'
 export { jsx as createElement } from './jsx'
 export { Global } from './global'