add all frontend files

node_modules/rc-tree/es/Indent.js

@@ -0,0 +1,22 @@
+import _defineProperty from "@babel/runtime/helpers/esm/defineProperty";
+import classNames from 'classnames';
+import * as React from 'react';
+var Indent = function Indent(_ref) {
+  var prefixCls = _ref.prefixCls,
+    level = _ref.level,
+    isStart = _ref.isStart,
+    isEnd = _ref.isEnd;
+  var baseClassName = "".concat(prefixCls, "-indent-unit");
+  var list = [];
+  for (var i = 0; i < level; i += 1) {
+    list.push( /*#__PURE__*/React.createElement("span", {
+      key: i,
+      className: classNames(baseClassName, _defineProperty(_defineProperty({}, "".concat(baseClassName, "-start"), isStart[i]), "".concat(baseClassName, "-end"), isEnd[i]))
+    }));
+  }
+  return /*#__PURE__*/React.createElement("span", {
+    "aria-hidden": "true",
+    className: "".concat(prefixCls, "-indent")
+  }, list);
+};
+export default /*#__PURE__*/React.memo(Indent);