fix: resolve build error

Author: cjw783

packages/react-flicking/src/react-flicking/index.ts

@@ -6,14 +6,16 @@ import Flicking from "./Flicking";
 import CrossFlicking from "./CrossFlicking";
 import CrossGroup from "./CrossGroup";
 import ViewportSlot from "./ViewportSlot";
+import { useFlickingStateApi } from "./state-api";
 
 export * from "@egjs/flicking";
 export * from "./types";
-export * from "./state-api";
+
 
 export {
   CrossFlicking,
   CrossGroup,
   ViewportSlot,
+  useFlickingStateApi
 }
 export default Flicking;

packages/react-flicking/src/react-flicking/index.umd.ts

@@ -7,5 +7,5 @@ import ViewportSlot from "./ViewportSlot";
 import { useFlickingStateApi } from "./state-api";
 
 (Flicking as any).ViewportSlot = ViewportSlot;
-export { useFlickingStateApi };
+(Flicking as any).useFlickingStateApi = useFlickingStateApi;
 export default Flicking;