linwenling
2023-10-22 cf948b62048be5f217623cc31a0d6d2680c72476
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import { TimestampProvider } from '../types';
 
interface PerformanceTimestampProvider extends TimestampProvider {
  delegate: TimestampProvider | undefined;
}
 
export const performanceTimestampProvider: PerformanceTimestampProvider = {
  now() {
    // Use the variable rather than `this` so that the function can be called
    // without being bound to the provider.
    return (performanceTimestampProvider.delegate || performance).now();
  },
  delegate: undefined,
};