extract time utils

src/utils/time.spec.ts

@@ -0,0 +1,33 @@
+/**
+ * Copyright 2024 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.
+ */
+import {expect} from 'chai';
+
+import {getTimestamp} from './time.js';
+
+describe('getTimestamp', () => {
+  it('should return a number', () => {
+    const timestamp = getTimestamp();
+    expect(timestamp).to.be.a('number');
+  });
+
+  it(`should return a timestamp between '2020-01-01 00:00:00' and '2100-01-01 00:00:00'`, () => {
+    const timestamp = getTimestamp();
+    // Using a large delta to account for execution time and clock drift.
+    // In a real test, consider mocking the underlying time source.
+    expect(timestamp).to.be.within(1577833200000, 4102441200000);
+  });
+});

src/utils/time.ts

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+/**
+ * Copyright 2024 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.
+ */
+
+export function getTimestamp(): number {
+  // `timestamp` from the event is MonotonicTime, not real time, so
+  // the best Mapper can do is to set the timestamp to the epoch time
+  // of the event arrived.
+  // https://chromedevtools.github.io/devtools-protocol/tot/Network/#type-MonotonicTime
+  return new Date().getTime();
+}