description

# isCompleted property Null safety

bool isCompleted

Whether the future has been completed.

Reflects whether complete or completeError has been called. A `true` value doesn't necessarily mean that listeners of this future have been invoked yet, either because the completer usually waits until a later microtask to propagate the result, or because complete was called with a future that hasn't completed yet.

When this value is `true`, complete and completeError must not be called again.

## Implementation

    bool get isCompleted;