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frontend/node_modules/antd/es/watermark/useSingletonCache.js

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+import * as React from 'react';
+import isEqual from "rc-util/es/isEqual";
+/**
+ * Singleton cache will only take latest `cacheParams` as key
+ * and return the result for callback matching.
+ */
+export default function useSingletonCache() {
+  const cacheRef = React.useRef([null, null]);
+  const getCache = (cacheKeys, callback) => {
+    const filteredKeys = cacheKeys.map(item => item instanceof HTMLElement || Number.isNaN(item) ? '' : item);
+    if (!isEqual(cacheRef.current[0], filteredKeys)) {
+      cacheRef.current = [filteredKeys, callback()];
+    }
+    return cacheRef.current[1];
+  };
+  return getCache;
+}