add all frontend files

node_modules/rc-resize-observer/es/SingleObserver/index.d.ts

@@ -0,0 +1,7 @@
+import * as React from 'react';
+import type { ResizeObserverProps } from '..';
+export interface SingleObserverProps extends ResizeObserverProps {
+    children: React.ReactElement | ((ref: React.RefObject<Element>) => React.ReactElement);
+}
+declare const RefSingleObserver: React.ForwardRefExoticComponent<SingleObserverProps & React.RefAttributes<HTMLElement>>;
+export default RefSingleObserver;