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prefer-async-callback

v1.31.0
style
effort: 2m
has auto-fix
starter+

Suggests using the AsyncCallback typedef instead of Future<void> Function().

Example​

❌ Bad:

// LINT: Prefer using AsyncCallback instead of Future<void> Function().
void fn(List<Future<void> Function()> _callbacks) {
  // LINT: Prefer using AsyncCallback instead of Future<void> Function().
  final Future<void> Function()? onPressed = enabled ? () {} : null;

  // LINT: Prefer using AsyncCallback instead of Future<void> Function().
  Future<void> Function()? onTap;

  // LINT: Prefer using AsyncCallback instead of Future<void> Function().
  final List<Future<void> Function()> callbacks = _callbacks;

  // LINT: Prefer using AsyncCallback instead of Future<void> Function().
  for (final Future<void> Function() callback in callbacks) {
    callback();
  }
}

✅ Good:

void fn(List<AsyncCallback> _callbacks) {
  final AsyncCallback? onPressed = enabled ? () {} : null;

  AsyncCallback? onTap;

  final List<AsyncCallback> callbacks = _callbacks;

  for (final AsyncCallback callback in callbacks) {
    callback();
  }
}
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