https://codesandbox.io/s/elastic-mayer-rzz4h2?file=/package.json

This is supposed to `console.error` but it doesn't.

17 warns: https://codesandbox.io/s/admiring-minsky-sze07m?file=/src/App.js
return null;
}
export function flushRoot(root: FiberRoot, lanes: Lanes) {
  if (lanes !== NoLanes) {
    markRootEntangled(root, mergeLanes(lanes, SyncLane));
    ensureRootIsScheduled(root, now());
    if ((executionContext & (RenderContext | CommitContext)) === NoContext) {
      resetRenderTimer();
      flushSyncCallbacks();
    }
  }
}
export function getExecutionContext(): ExecutionContext {
  return executionContext;
}
export function deferredUpdates<A>(fn: () => A): A {
  const previousPriority = getCurrentUpdatePriority();
  const prevTransition = ReactCurrentBatchConfig.transition;
  try {
    ReactCurrentBatchConfig.transition = null;
    setCurrentUpdatePriority(DefaultEventPriority);
    return fn();
  } finally {
    setCurrentUpdatePriority(previousPriority);
    ReactCurrentBatchConfig.transition = prevTransition;
  }
}
export function batchedUpdates<A, R>(fn: A => R, a: A): R {
  const prevExecutionContext = executionContext;
  executionContext |= BatchedContext;