How to implement a task in a macro task within asynchronous programming?

In Flutter (Dart), to perform a task in a macro task, you can use the scheduleMicrotask function for microtasks, but for macro tasks, Future with Future.delayed(Duration.zero) or Timer.run are usually used.

Example:

import 'dart:async';

void main() {
  print('start');

  // Macro task
  Timer.run(() {
    print('macro task');
  });

  print('end');
}

The output will be:

start
end
macro task

Thus, Timer.run queues a task in the macro task queue, which will execute after the current synchronous code and microtasks.