Completes future with the supplied values.
The value must be either a value of type T
or a future of type Future<T>
.
If the value is itself a future, the completer will wait for that future to complete, and complete with the same result, whether it is a success or an error.
Calling complete or completeError must be done at most once.
All listeners on the future are informed about the value.
void complete([FutureOr<T> value]);
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-async/Completer/complete.html