- import 'dart:async';
- typedef FutureCallback<T> = Future<T> Function();
- typedef IntervalCallback<T> = Future<T> Function(int times);
- typedef Cancelable<T> = void Function();
- typedef FutureCompleter<T> = void Function(Completer<T> completer);
- typedef Predicate<T> = bool Function(T? value);
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