We don't actually use this anywhere, so let's remove it.

https://github.com/facebook/react/blob/f1d00156df5453bc62bd5668fefdcac4ca67e90e/src/renderers/shared/fiber/ReactFiberScheduler.js#L1504-L1512
let isBatchingUpdates: boolean = false;
  
  
  let isUnbatchingUpdates: boolean = false;
  
  let nextUnitOfWork: Fiber | null = null;
  let nextPriorityLevel: PriorityLevel = NoWork;
  
  let nextEffect: Fiber | null = null;
  let pendingCommit: Fiber | null = null;
  
  let nextScheduledRoot: FiberRoot | null = null;
  let lastScheduledRoot: FiberRoot | null = null;
  
  let isCallbackScheduled: boolean = false;
  
  
  let capturedErrors: Map<Fiber, CapturedError> | null = null;
  
  
  
  
  let failedBoundaries: Set<Fiber> | null = null;
   Error boundaries that captured an error during the current commit.
  let commitPhaseBoundaries: Set<Fiber> | null = null;
  let firstUncaughtError: mixed | null = null;
  let didFatal: boolean = false;
  let isCommitting: boolean = false;
  let isUnmounting: boolean = false;
   Use these to prevent an infinite loop of nested updates