public function itemsCommand($format = 'json', $packageKey = null)
    {
        $sitePackageKey = $packageKey ?: $this->getDefaultSitePackageKey();

        $fusionAst = $this->fusionService->getMergedFusionObjectTreeForSitePackage($sitePackageKey);
        $styleguideObjects = $this->fusionService->getStyleguideObjectsFromFusionAst($fusionAst);

        $this->outputData($styleguideObjects, $format);
    }