prefer_underscore_for_unused_callback_parameters

Details

DO use _ for unused callback parameters.

see: effective-dart and wildcard variables

itemBuilder: (context, index) {
  return Text('Item $index');
}

itemBuilder: (_, index) {
  return Text('Item $index');
}

Usage

To enable the prefer_underscore_for_unused_callback_parameters rule, add prefer_underscore_for_unused_callback_parameters under custom_lint > rules in your analysis_options.yaml file:

custom_lint:
  rules:
    - prefer_underscore_for_unused_callback_parameters