description

# Stream<T>.fromFuture constructor Null safety

Stream<T>.fromFuture(

1. Future<T> future

)

Creates a new single-subscription stream from the future.

When the future completes, the stream will fire one event, either data or error, and then close with a done-event.

## Implementation

    factory Stream.fromFuture(Future<T> future) {
      // Use the controller's buffering to fill in the value even before
      // the stream has a listener. For a single value, it's not worth it
      // to wait for a listener before doing the `then` on the future.
      _StreamController<T> controller =
          new _SyncStreamController<T>(null, null, null, null);
      future.then((value) {
        controller._add(value);
        controller._closeUnchecked();
      }, onError: (error, stackTrace) {
        controller._addError(error, stackTrace);
        controller._closeUnchecked();
      });
      return controller.stream;
    }