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When we replay logs we badge them with e.g. `[Server]`. That way it's easy to identify that the source of the log actually happened on the Server (RSC). However, when we threw an error we didn't have any such thing. The error was rethrown on the client and then handled just like any other client error. This transfers the `environmentName` in DEV to our restored Error "sub-class" (conceptually) along with `digest`. That way you can read `error.environmentName` to print this in your own UI. I also updated our default for `onCaughtError` (and `onError` in Fizz) to use the `printToConsole` helper that the Flight Client uses to log it with the badge format. So by default you get the same experience as console.error for caught errors: <img width="810" alt="Screenshot 2024-06-10 at 9 25 12 PM" src="https://github.com/facebook/react/assets/63648/8490fedc-09f6-4286-9332-fbe6b0faa2d3"> <img width="815" alt="Screenshot 2024-06-10 at 9 39 30 PM" src="https://github.com/facebook/react/assets/63648/bdcfc554-504a-4b1d-82bf-b717e74975ac"> Unfortunately I can't do the same thing for `onUncaughtError` nor `onRecoverableError` because they use `reportError` which doesn't have custom formatting (unless we also prevented default on window.onerror). However maybe that's ok because 1) you should always have an error boundary 2) it's not likely that an RSC error can actually recover because it's not going to be rendered again so shouldn't really happen outside some parent conditionally rendering maybe. The other problem with this approach is that the default is no longer trivial - so reimplementing the default in user space is trickier and ideally we shouldn't expose our default to be called.
react-server
This is an experimental package for creating custom React streaming server renderers.
Its API is not as stable as that of React, React Native, or React DOM, and does not follow the common versioning scheme.
Use it at your own risk.