[futureValue]
) Returns a future that handles the onDone and onError callbacks.
This method overwrites the existing onDone and onError callbacks with new ones that complete the returned future.
In case of an error the subscription will automatically cancel (even
when it was listening with cancelOnError set to false).
In case of a done event the future completes with the given
futureValue.
Source
/**
* Returns a future that handles the [onDone] and [onError] callbacks.
*
* This method *overwrites* the existing [onDone] and [onError] callbacks
* with new ones that complete the returned future.
*
* In case of an error the subscription will automatically cancel (even
* when it was listening with `cancelOnError` set to `false`).
*
* In case of a `done` event the future completes with the given
* [futureValue].
*/
Future asFuture([var futureValue]);