add all frontend files

node_modules/rc-tree-select/es/hooks/useRefFunc.js

@@ -0,0 +1,14 @@
+import * as React from 'react';
+
+/**
+ * Same as `React.useCallback` but always return a memoized function
+ * but redirect to real function.
+ */
+export default function useRefFunc(callback) {
+  var funcRef = React.useRef();
+  funcRef.current = callback;
+  var cacheFn = React.useCallback(function () {
+    return funcRef.current.apply(funcRef, arguments);
+  }, []);
+  return cacheFn;
+}