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This lets you pass Promises from server components to client components and `use()` them there. We still don't support Promises as children on the client, so we need to support both. This will be a lot simpler when we remove the need to encode children as lazy since we don't need the lazy encoding anymore then. I noticed that this test failed because we don't synchronously resolve instrumented Promises if they're lazy. The second fix calls `.then()` early to ensure that this lazy initialization can happen eagerly. ~It felt silly to do this with an empty function or something, so I just did the attachment of ping listeners early here. It's also a little silly since they will ping the currently running render for no reason if it's synchronously available.~ EDIT: That didn't work because a ping might interrupt the current render. Probably need a bigger refactor. We could add another extension but we've already taken a lot of liberties with the Promise protocol. At least this is one that doesn't need extension of the protocol as much. Any sub-class of promises could do this.
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.