add all frontend files

node_modules/rc-virtual-list/es/ScrollBar.d.ts

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+import * as React from 'react';
+export type ScrollBarDirectionType = 'ltr' | 'rtl';
+export interface ScrollBarProps {
+    prefixCls: string;
+    scrollOffset: number;
+    scrollRange: number;
+    rtl: boolean;
+    onScroll: (scrollOffset: number, horizontal?: boolean) => void;
+    onStartMove: () => void;
+    onStopMove: () => void;
+    horizontal?: boolean;
+    style?: React.CSSProperties;
+    thumbStyle?: React.CSSProperties;
+    spinSize: number;
+    containerSize: number;
+    showScrollBar?: boolean | 'optional';
+}
+export interface ScrollBarRef {
+    delayHidden: () => void;
+}
+declare const ScrollBar: React.ForwardRefExoticComponent<ScrollBarProps & React.RefAttributes<ScrollBarRef>>;
+export default ScrollBar;