add hw2

node_modules/chromium-bidi/lib/cjs/utils/DefaultMap.js

@@ -0,0 +1,40 @@
+"use strict";
+/**
+ * Copyright 2023 Google LLC.
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.DefaultMap = void 0;
+/**
+ * A subclass of Map whose functionality is almost the same as its parent
+ * except for the fact that DefaultMap never returns undefined. It provides a
+ * default value for keys that do not exist.
+ */
+class DefaultMap extends Map {
+    /** The default value to return whenever a key is not present in the map. */
+    #getDefaultValue;
+    constructor(getDefaultValue, entries) {
+        super(entries);
+        this.#getDefaultValue = getDefaultValue;
+    }
+    get(key) {
+        if (!this.has(key)) {
+            this.set(key, this.#getDefaultValue(key));
+        }
+        return super.get(key);
+    }
+}
+exports.DefaultMap = DefaultMap;
+//# sourceMappingURL=DefaultMap.js.map