prefer-void-callback

v1.31.0

style

effort: 2m

has auto-fix

starter+

Suggests using the VoidCallback typedef instead of void Function().

Example

❌ Bad:

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

  // LINT: Prefer using VoidCallback instead of void Function().
  void Function()? onTap;

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

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

✅ Good:

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

  VoidCallback? onTap;

  final List<VoidCallback> callbacks = _callbacks;

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

Related Rules

• prefer-extracting-callbacks
• prefer-async-callback