promotion abstract method

TRes promotion(
  1. Iterable<Input$PromotionProductsInput>? _fn(
    1. Iterable<CopyWith$Input$PromotionProductsInput<Input$PromotionProductsInput>>?
    )
)

Implementation

TRes promotion(
    Iterable<Input$PromotionProductsInput>? Function(
            Iterable<
                CopyWith$Input$PromotionProductsInput<
                    Input$PromotionProductsInput>>?)
        _fn);