add all frontend files

node_modules/rc-tree/es/DropIndicator.js

@@ -0,0 +1,34 @@
+import React from 'react';
+var DropIndicator = function DropIndicator(props) {
+  var dropPosition = props.dropPosition,
+    dropLevelOffset = props.dropLevelOffset,
+    indent = props.indent;
+  var style = {
+    pointerEvents: 'none',
+    position: 'absolute',
+    right: 0,
+    backgroundColor: 'red',
+    height: 2
+  };
+  switch (dropPosition) {
+    case -1:
+      style.top = 0;
+      style.left = -dropLevelOffset * indent;
+      break;
+    case 1:
+      style.bottom = 0;
+      style.left = -dropLevelOffset * indent;
+      break;
+    case 0:
+      style.bottom = 0;
+      style.left = indent;
+      break;
+  }
+  return /*#__PURE__*/React.createElement("div", {
+    style: style
+  });
+};
+if (process.env.NODE_ENV !== 'production') {
+  DropIndicator.displayName = 'DropIndicator';
+}
+export default DropIndicator;