description

# complete method Null safety

void complete (

1. [FutureOr<T>? value]

)

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 omitted or null, and `T` is not nullable, the call to `complete` throws.

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.

## Implementation

    void complete([FutureOr<T>? value]);