AsyncSnapshotListenerCallback<R, SNAPSHOT_TYPE extends AsyncSnapshot<R> > typedef
AsyncSnapshotListenerCallback<R, SNAPSHOT_TYPE extends AsyncSnapshot<R> > =
void Function(SNAPSHOT_TYPE snapshot)
Signature of callbacks that have snapshot
s in argument which describes state of an asynchronous computation.
Implementation
typedef AsyncSnapshotListenerCallback<R, SNAPSHOT_TYPE extends AsyncSnapshot<R>>
= void Function(SNAPSHOT_TYPE snapshot);