private static void setupFrameworkLibraries(Element head, JsonObject initialUIDL, BootstrapContext context) { inlineEs6Collections(head, context); appendWebComponentsPolyfills(head, context); if (context.getPushMode().isEnabled()) { head.appendChild(getPushScript(context)); } head.appendChild(getBootstrapScript(initialUIDL, context)); head.appendChild(createJavaScriptElement(getClientEngineUrl(context))); }