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- This is a stream that accepts a list of futures and accumulates all their results. When all the futures have completed, the accumulated results are emitted as a single event (the list of results) and then a done event is emitted.
- A list of elements which can be endlessly iterated.
- A NotificationManager implementation that returns a fixed string for the device token. Intended for use in tests only.
- An in-memory database, backed by a Map.
- An interface to get the token used by Firebase Cloud Messaging to identify a particular device.
R, T> = R Function(T arg)