Method _runTimerHandle

packages/jest-fake-timers/src/legacyFakeTimers.ts:609–632

(timerHandle: TimerID)

  }

  private _runTimerHandle(timerHandle: TimerID) {
    const timer = this._timers.get(timerHandle);

    if (!timer) {
      // Timer has been cleared - we'll hit this when a timer is cleared within
      // another timer in runOnlyPendingTimers
      return;
    }

    switch (timer.type) {
      case 'timeout':
        this._timers.delete(timerHandle);
        timer.callback();
        break;

      case 'interval':
        timer.expiry = this._now + (timer.interval || 0);
        timer.callback();
        break;

      default:
        throw new Error(`Unexpected timer type: ${timer.type}`);
    }
  }
}