I can't quite figure out how to use the profiling build. I aliased `react-dom` to `react-dom/profiling` but I get this error:

<img width="448" alt="screen shot 2018-09-08 at 20 17 02" src="https://user-images.githubusercontent.com/810438/45257816-2d405780-b3a4-11e8-9615-0b27abd0442b.png">
<img width="272" alt="screen shot 2018-09-08 at 20 17 06" src="https://user-images.githubusercontent.com/810438/45257817-2d405780-b3a4-11e8-8a08-f5a0650debfe.png">

I didn't want interactions, I just want profiling. What am I doing wrong?

To repro, use CRA, then eject, then add `react-dom` -> `react-dom/profiling` to alias in webpack prod config and build.
}
    }
    fiber = fiber.return;
  }
  if (sourceFiber.tag === HostRoot) {
    
    
    const rootFiber = sourceFiber;
    const errorInfo = createCapturedValue(value, rootFiber);
    const update = createRootErrorUpdate(rootFiber, errorInfo, expirationTime);
    enqueueUpdate(rootFiber, update);
    scheduleWork(rootFiber, expirationTime);
  }
}
function captureCommitPhaseError(fiber: Fiber, error: mixed) {
  return dispatch(fiber, error, Sync);
}
function computeThreadID(
  expirationTime: ExpirationTime,
  interactionThreadID: number,
): number {
  
  return expirationTime * 1000 + interactionThreadID;
}
function computeUniqueAsyncExpiration(): ExpirationTime {
  const currentTime = requestCurrentTime();
  let result = computeAsyncExpiration(currentTime);
  if (result <= lastUniqueAsyncExpiration) {