add all frontend files

node_modules/rc-util/es/Children/mapSelf.js

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+import React from 'react';
+function mirror(o) {
+  return o;
+}
+export default function mapSelf(children) {
+  // return ReactFragment
+  return React.Children.map(children, mirror);
+}

node_modules/rc-util/es/Children/toArray.d.ts

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+import React from 'react';
+export interface Option {
+    keepEmpty?: boolean;
+}
+export default function toArray(children: React.ReactNode, option?: Option): React.ReactElement[];

node_modules/rc-util/es/Children/toArray.js

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+import isFragment from "../React/isFragment";
+import React from 'react';
+export default function toArray(children) {
+  var option = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+  var ret = [];
+  React.Children.forEach(children, function (child) {
+    if ((child === undefined || child === null) && !option.keepEmpty) {
+      return;
+    }
+    if (Array.isArray(child)) {
+      ret = ret.concat(toArray(child));
+    } else if (isFragment(child) && child.props) {
+      ret = ret.concat(toArray(child.props.children, option));
+    } else {
+      ret.push(child);
+    }
+  });
+  return ret;
+}