Unclear how to handle conditional UI, when resolving the condition is async

[mit-mit]

Occasionally apps need to render different UI depending on some condition that is resolved asynchronously, for example:

• Dependent on device vs. emulator: The device_info package has an isEmulator API, but this is async

• Dependent on login state: The firebase_auth package handles login, but asking if the user is logged in or not is async

It would be great if flutter.io has documentation for how to generally render UI that is conditional on async state.

[goderbauer]

The cookbook would be a great place to add this (https://flutter.io/docs/cookbook).

Should this be moved to the website repo?

[zoechi]

Issue moved to flutter/website #2133 via ZenHub

[github-actions]

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