expose state transition on provided

Author: kwasniew

src/FlagProvider.tsx

@@ -9,6 +9,7 @@ export interface IFlagProvider {
   unleashClient?: UnleashClient;
   startClient?: boolean;
   stopClient?: boolean;
+  startTransition?: (fn: () => void) => void;
 }
 
 const offlineConfig: IConfig = {
@@ -23,9 +24,8 @@ const offlineConfig: IConfig = {
 // save startTransition as var to avoid webpack analysis (https://github.com/webpack/webpack/issues/14814)
 const _startTransition = 'startTransition';
 // fallback for React <18 which doesn't support startTransition
-const isReactNative = typeof navigator !== 'undefined' && navigator?.product === 'ReactNative';
 // Fallback for React <18 and exclude startTransition if in React Native
-const startTransition: (fn: () => void) => void = !isReactNative && React[_startTransition]
+const defaultStartTransition: (fn: () => void) => void = React[_startTransition]
   ? React[_startTransition]
   : (fn => fn());
 
@@ -35,6 +35,7 @@ const FlagProvider: FC<PropsWithChildren<IFlagProvider>> = ({
   unleashClient,
   startClient = true,
   stopClient = true,
+  startTransition = defaultStartTransition
 }) => {
   const config = customConfig || offlineConfig;
   const client = React.useRef<UnleashClient>(