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PerformanceObserver

The global PerformanceObserver class, as defined in Web specifications.

Example​

ts
const observer = new PerformanceObserver(
  (list, observer, options) => {
    for (const entry of list.getEntries()) {
      console.log(
        'Received entry with type',
        entry.entryType,
        'and name',
        entry.name,
        'that started at',
        entry.startTime,
        'and took',
        entry.duration,
        'ms',
      );
    }
  },
);

observer.observe({entryTypes: ['mark', 'measure']});

Reference

Constructor​

PerformanceObserver()​

See documentation in MDN.

Static properties​

supportedEntryTypes​

See documentation in MDN.

Returns ['mark', 'measure', 'event', 'longtask'].

Instance methods​

observe()​

See documentation in MDN.

disconnect()​

See documentation in MDN.