| // Copyright 2014 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| import 'dart:js_interop'; |
| |
| /// Returns the current timestamp in microseconds from a monotonically |
| /// increasing clock. |
| /// |
| /// This is the web implementation, which uses `window.performance.now` as the |
| /// source of the timestamp. |
| /// |
| /// See: |
| /// * https://developer.mozilla.org/en-US/docs/Web/API/Performance/now |
| double get performanceTimestamp => 1000 * _performance.now(); |
| |
| @JS() |
| @staticInterop |
| class _DomPerformance {} |
| |
| @JS('performance') |
| external _DomPerformance get _performance; |
| |
| extension _DomPerformanceExtension on _DomPerformance { |
| @JS() |
| external double now(); |
| } |
