private static IsolatedIdeaModuleInternal build(Project project, boolean offlineDependencyResolution) {
        project.getPluginManager().apply(IdeaPlugin.class);

        IdeaModel ideaModelExt = project.getExtensions().getByType(IdeaModel.class);
        IdeaModuleInternal ideaModuleExt = (IdeaModuleInternal) ideaModelExt.getModule();

        ideaModuleExt.setOffline(offlineDependencyResolution);

                rootProject.configure(scalaProjects, new Action<Project>() {
                    @Override
                    public void execute(final Project project) {
                        project.getExtensions().getByType(IdeaModel.class).getModule().getIml().withXml(new Action<XmlProvider>() {
                            @Override
                            public void execute(XmlProvider xmlProvider) {

        assertThat(task.destinationDir, equalTo(new File(project.docsDir, 'groovydoc')))
        assertThat(task.docTitle, equalTo(project.extensions.getByType(ReportingExtension).apiDocTitle))
        assertThat(task.windowTitle, equalTo(project.extensions.getByType(ReportingExtension).apiDocTitle))
    }

        project.getPluginManager().apply(JavaBasePlugin.class);
        JavaPluginExtension java = project.getExtensions().getByType(JavaPluginExtension.class);
        TestingExtension testing = project.getExtensions().getByType(TestingExtension.class);
        ExtensiblePolymorphicDomainObjectContainer<TestSuite> testSuites = testing.getSuites();

            get() = project.sourceSets["main"].kotlin
    }
}


val Project.kotlinDslPluginOptions: KotlinDslPluginOptions
    get() = extensions.getByType()


private
val Project.sourceSets: SourceSetContainer
    get() = extensions.getByType()


private
val SourceSet.kotlin: SourceDirectorySet

abstract class CustomTaskUsingToolchains extends DefaultTask {

    @Nested
    abstract Property<JavaLauncher> getLauncher() // <1>

    CustomTaskUsingToolchains() {
        def toolchain = project.extensions.getByType(JavaPluginExtension.class).toolchain // <2>
        Provider<JavaLauncher> defaultLauncher = getJavaToolchainService().launcherFor(toolchain) // <3>
        launcher.convention(defaultLauncher) // <4>
    }

    @TaskAction

    }

    private void configureCoverageDataElementsVariants(Project project) {
        project.getPlugins().withType(JvmTestSuitePlugin.class, p -> {
            final TestingExtension testing = project.getExtensions().getByType(TestingExtension.class);
            final ExtensiblePolymorphicDomainObjectContainer<TestSuite> testSuites = testing.getSuites();

            testSuites.withType(JvmTestSuite.class).configureEach(suite -> {

        testAggregation.setDescription("A configuration to collect test execution results");
        testAggregation.setVisible(false);

        ReportingExtension reporting = project.getExtensions().getByType(ReportingExtension.class);
        reporting.getReports().registerBinding(AggregateTestReport.class, DefaultAggregateTestReport.class);

        ObjectFactory objects = project.getObjects();

        // Careful! Eagerly appyling plugins has downsides, and is not always recommended.
        project.getPlugins().apply(JavaPlugin.class);
        SourceSetContainer sourceSets = project.getExtensions().getByType(SourceSetContainer.class);
        SourceSet main = sourceSets.getByName(SourceSet.MAIN_SOURCE_SET_NAME);
        main.getJava().setSrcDirs(Arrays.asList("src"));
    }
}

        return extensionsStorage.getSchema();
    }

    @Override
    public <T> T getByType(Class<T> type) {
        return getByType(typeOf(type));
    }

    @Override
    public <T> T getByType(TypeOf<T> type) {
        return extensionsStorage.getByType(type);
    }

    @Override
    public <T> T findByType(Class<T> type) {
        return findByType(typeOf(type));