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* Move flushSync warning to React DOM When you call in `flushSync` from an effect, React fires a warning. I've moved the implementation of this warning out of the reconciler and into React DOM. `flushSync` is a renderer API, not an isomorphic API, because it has behavior that was designed specifically for the constraints of React DOM. The equivalent API in a different renderer may not be the same. For example, React Native has a different threading model than the browser, so it might not make sense to expose a `flushSync` API to the JavaScript thread. * Make root.unmount() synchronous When you unmount a root, the internal state that React stores on the DOM node is immediately cleared. So, we should also synchronously delete the React tree. You should be able to create a new root using the same container.