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frontend/node_modules/rc-virtual-list/lib/utils/CacheMap.js

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+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+var _classCallCheck2 = _interopRequireDefault(require("@babel/runtime/helpers/classCallCheck"));
+var _createClass2 = _interopRequireDefault(require("@babel/runtime/helpers/createClass"));
+var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));
+// Firefox has low performance of map.
+var CacheMap = /*#__PURE__*/function () {
+  function CacheMap() {
+    (0, _classCallCheck2.default)(this, CacheMap);
+    (0, _defineProperty2.default)(this, "maps", void 0);
+    // Used for cache key
+    // `useMemo` no need to update if `id` not change
+    (0, _defineProperty2.default)(this, "id", 0);
+    (0, _defineProperty2.default)(this, "diffRecords", new Map());
+    this.maps = Object.create(null);
+  }
+  (0, _createClass2.default)(CacheMap, [{
+    key: "set",
+    value: function set(key, value) {
+      // Record prev value
+      this.diffRecords.set(key, this.maps[key]);
+      this.maps[key] = value;
+      this.id += 1;
+    }
+  }, {
+    key: "get",
+    value: function get(key) {
+      return this.maps[key];
+    }
+
+    /**
+     * CacheMap will record the key changed.
+     * To help to know what's update in the next render.
+     */
+  }, {
+    key: "resetRecord",
+    value: function resetRecord() {
+      this.diffRecords.clear();
+    }
+  }, {
+    key: "getRecord",
+    value: function getRecord() {
+      return this.diffRecords;
+    }
+  }]);
+  return CacheMap;
+}();
+var _default = exports.default = CacheMap;