Exports

The constructor of this class is not exposed to users directly.

@since v8.5.0

Exposes marks created via the Performance.mark() method.

@since v18.2.0, v16.17.0

Exposes measures created via the Performance.measure() method.

The constructor of this class is not exposed to users directly.

@since v18.2.0, v16.17.0

This property is an extension by Node.js. It is not available in Web browsers.

Provides timing details for Node.js itself. The constructor of this class is not exposed to users.

@since v8.5.0

@since v8.5.0

Provides detailed network timing data regarding the loading of an application's resources.

The constructor of this class is not exposed to users directly.

@since v18.2.0, v16.17.0

Returns a RecordableHistogram.

@since v15.9.0, v14.18.0

This property is an extension by Node.js. It is not available in Web browsers.

Creates an IntervalHistogram object that samples and reports the event loop delay over time. The delays will be reported in nanoseconds.

Using a timer to detect approximate event loop delay works because the execution of timers is tied specifically to the lifecycle of the libuv event loop. That is, a delay in the loop will cause a delay in the execution of the timer, and those delays are specifically what this API is intended to detect.

import { monitorEventLoopDelay } from 'node:perf_hooks';
const h = monitorEventLoopDelay({ resolution: 20 });
h.enable();
// Do something.
h.disable();
console.log(h.min);
console.log(h.max);
console.log(h.mean);
console.log(h.stddev);
console.log(h.percentiles);
console.log(h.percentile(50));
console.log(h.percentile(99));

@since v11.10.0