The idea was that we might be able to get useUser to load with the correct auth state faster than if we had waited for the underlying useIdTokenResult to finish. This was based on the assumption that auth.currentUser is undefined while the Auth SDK is booting up, nullonly when the Auth SDK is booted up and a user isn't signed in, and truthy otherwise.
Description
useUsercurrently overridesinitialDataifauth.currentUseris not undefined:https://github.com/FirebaseExtended/reactfire/blob/414201e88bd6f6701998993f6203e4d49773147b/src/auth.tsx#L29-L33
The idea was that we might be able to get
useUserto load with the correct auth state faster than if we had waited for the underlyinguseIdTokenResultto finish. This was based on the assumption thatauth.currentUserisundefinedwhile the Auth SDK is booting up,nullonly when the Auth SDK is booted up and a user isn't signed in, and truthy otherwise.However, this is undocumented behavior, so we shouldn't rely on it.