Function startPerf

lib/internal/perf/observe.js:546–551

(target, key, context = kEmptyObject)

function startPerf(target, key, context = kEmptyObject) {
  target[key] = {
    ...context,
    startTime: now(),
  };
}

function stopPerf(target, key, context = kEmptyObject) {
  const ctx = target[key];