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
}
    const tag = fiber.tag;
    if (
      tag !== IndeterminateComponent &&
      tag !== HostRoot &&
      tag !== ClassComponent &&
      tag !== FunctionComponent &&
      tag !== ForwardRef &&
      tag !== MemoComponent &&
      tag !== SimpleMemoComponent
    ) {
       O
      return;
    }
     W
     t
    const componentName = getComponentNameFromFiber(fiber) || 'ReactComponent';
    if (didWarnStateUpdateForNotYetMountedComponent !== null) {
      if (didWarnStateUpdateForNotYetMountedComponent.has(componentName)) {
        return;
      }
      didWarnStateUpdateForNotYetMountedComponent.add(componentName);
    } else {
      didWarnStateUpdateForNotYetMountedComponent = new Set([componentName]);
    }
    const previousFiber = ReactCurrentFiberCurrent;
    try {
      setCurrentDebugFiberInDEV(fiber);
      console.error(
        "Can't perform a React state update on a component that hasn't mounted yet. " +