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frontend/node_modules/antd/es/layout/hooks/useHasSider.js

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+import toArray from "rc-util/es/Children/toArray";
+import Sider from '../Sider';
+export default function useHasSider(siders, children, hasSider) {
+  if (typeof hasSider === 'boolean') {
+    return hasSider;
+  }
+  if (siders.length) {
+    return true;
+  }
+  const childNodes = toArray(children);
+  return childNodes.some(node => node.type === Sider);
+}