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for your own libraries: https://docs.gradle.org/current/userguide/feature_variants.html for an external dependency you don't control: https://docs.gradle.org/current/userguide/component_metadata_rules.html

So maybe something like this?

abstract class ExampleDependenciesRule: ComponentMetadataRule {
    override fun execute(context: ComponentMetadataContext) {
        context.details.allVariants {
            withDependencies {
                removeIf {
                    it.group == "org.example" && it.name == "using-log4j"
                }
                add("org.example:using-slf4j")

            }
        }
    }
}

I'd use

removeAll

as it's a kotlin extension that gets inlined as opposed to a Java default method that Gradle will have some problems caching if the lambda gets compiled with invokedynamic, but basically yes

Thanks