ControllableFuture

• Cancel the Future

final controllable = ControllableFuture(() async {
  /// some asynchronous code here,
}, onCancel: () {
  // return an alternate value
});

// to wait
await controllable.future;

// to cancel
controllable.cancel();

Why not CancelableOperaion in package:async ?

It does not step out of the Future on cancellation. It just ignores the Future.

But this package actually cancels it.