}

    public ImmutableMap<String, Configuration> getConfigurationDefinitions() {
        return configurationDefinitions;
    }

    private Optional<List<? extends VariantGraphResolveMetadata>> buildVariantsForGraphTraversal() {
        ImmutableList<? extends ComponentVariant> variants = getVariants();
        if (variants.isEmpty()) {
            return addVariantsByRule(maybeDeriveVariants());
        }