add all frontend files

node_modules/rc-util/lib/hooks/useSyncState.d.ts

@@ -0,0 +1,9 @@
+type Updater<T> = T | ((prevValue: T) => T);
+export type SetState<T> = (nextValue: Updater<T>) => void;
+/**
+ * Same as React.useState but will always get latest state.
+ * This is useful when React merge multiple state updates into one.
+ * e.g. onTransitionEnd trigger multiple event at once will be merged state update in React.
+ */
+export default function useSyncState<T>(defaultValue?: T): [get: () => T, set: SetState<T>];
+export {};