// TODO: This breaks the provider
            options.links(javadocs.getJavaApi().get().toString(), javadocs.getGroovyApi().get().toString());

            task.source(extension.getDocumentedSource().filter(f -> f.getName().endsWith(".java")));

            task.setClasspath(extension.getClasspath());

            // TODO: This should be in Javadoc task

     */
    public abstract ConfigurableFileCollection getCssFiles();

    /**
     * The source code to be documented. This should be the "public" APIs.
     */
    public abstract ConfigurableFileCollection getDocumentedSource();

    /**
     * Source code root folders. Java, Groovy and Kotlin public API sources, including
     * generated code.
     */
    public abstract ConfigurableFileCollection getSourceRoots();

    /**

        javaSourceSet.register("java_api", spec -> {
            spec.getDisplayName().set("API");
            spec.getSourceRoots().from(extension.getDocumentedSource());
            spec.getClasspath().from(extension.getClasspath());
            spec.getIncludes().from(extension.getSourceRoot().file("kotlin/Module.md"));
            configureSourceLinks(project, extension, spec);