Function startProfilerTimer

packages/react-reconciler/src/ReactProfilerTimer.js:586–596

(fiber: Fiber)

}

export function startProfilerTimer(fiber: Fiber): void {
  if (!enableProfilerTimer) {
    return;
  }

  profilerStartTime = now();

  if (((fiber.actualStartTime: any): number) < 0) {
    fiber.actualStartTime = profilerStartTime;
  }
}

export function stopProfilerTimerIfRunning(fiber: Fiber): void {
  if (!enableProfilerTimer) {