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node_modules/@ant-design/cssinjs-utils/es/_util/hooks/useUniqueMemo.d.ts

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+import React from 'react';
+/**
+ * Like `useMemo`, but this hook result will be shared across all instances.
+ */
+declare function useUniqueMemo<T>(memoFn: () => T, deps: React.DependencyList): T;
+export default useUniqueMemo;

node_modules/@ant-design/cssinjs-utils/es/_util/hooks/useUniqueMemo.js

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+import _typeof from "@babel/runtime/helpers/esm/typeof";
+import _classCallCheck from "@babel/runtime/helpers/esm/classCallCheck";
+import _createClass from "@babel/runtime/helpers/esm/createClass";
+import _defineProperty from "@babel/runtime/helpers/esm/defineProperty";
+import React from 'react';
+var BEAT_LIMIT = 1000 * 60 * 10;
+
+/**
+ * A helper class to map keys to values.
+ * It supports both primitive keys and object keys.
+ */
+var ArrayKeyMap = /*#__PURE__*/function () {
+  function ArrayKeyMap() {
+    _classCallCheck(this, ArrayKeyMap);
+    _defineProperty(this, "map", new Map());
+    // Use WeakMap to avoid memory leak
+    _defineProperty(this, "objectIDMap", new WeakMap());
+    _defineProperty(this, "nextID", 0);
+    _defineProperty(this, "lastAccessBeat", new Map());
+    // We will clean up the cache when reach the limit
+    _defineProperty(this, "accessBeat", 0);
+  }
+  _createClass(ArrayKeyMap, [{
+    key: "set",
+    value: function set(keys, value) {
+      // New set will trigger clear
+      this.clear();
+
+      // Set logic
+      var compositeKey = this.getCompositeKey(keys);
+      this.map.set(compositeKey, value);
+      this.lastAccessBeat.set(compositeKey, Date.now());
+    }
+  }, {
+    key: "get",
+    value: function get(keys) {
+      var compositeKey = this.getCompositeKey(keys);
+      var cache = this.map.get(compositeKey);
+      this.lastAccessBeat.set(compositeKey, Date.now());
+      this.accessBeat += 1;
+      return cache;
+    }
+  }, {
+    key: "getCompositeKey",
+    value: function getCompositeKey(keys) {
+      var _this = this;
+      var ids = keys.map(function (key) {
+        if (key && _typeof(key) === 'object') {
+          return "obj_".concat(_this.getObjectID(key));
+        }
+        return "".concat(_typeof(key), "_").concat(key);
+      });
+      return ids.join('|');
+    }
+  }, {
+    key: "getObjectID",
+    value: function getObjectID(obj) {
+      if (this.objectIDMap.has(obj)) {
+        return this.objectIDMap.get(obj);
+      }
+      var id = this.nextID;
+      this.objectIDMap.set(obj, id);
+      this.nextID += 1;
+      return id;
+    }
+  }, {
+    key: "clear",
+    value: function clear() {
+      var _this2 = this;
+      if (this.accessBeat > 10000) {
+        var now = Date.now();
+        this.lastAccessBeat.forEach(function (beat, key) {
+          if (now - beat > BEAT_LIMIT) {
+            _this2.map.delete(key);
+            _this2.lastAccessBeat.delete(key);
+          }
+        });
+        this.accessBeat = 0;
+      }
+    }
+  }]);
+  return ArrayKeyMap;
+}();
+var uniqueMap = new ArrayKeyMap();
+
+/**
+ * Like `useMemo`, but this hook result will be shared across all instances.
+ */
+function useUniqueMemo(memoFn, deps) {
+  return React.useMemo(function () {
+    var cachedValue = uniqueMap.get(deps);
+    if (cachedValue) {
+      return cachedValue;
+    }
+    var newValue = memoFn();
+    uniqueMap.set(deps, newValue);
+    return newValue;
+  }, deps);
+}
+export default useUniqueMemo;