Function mark

lib/internal/perf/usertiming.js:167–172

(name, options)

}

function mark(name, options) {
  const mark = new PerformanceMark(name, options);
  enqueue(mark);
  bufferUserTiming(mark);
  return mark;
}

function calculateStartDuration(startOrMeasureOptions, endMark) {
  startOrMeasureOptions ??= 0;