public function getScriptInjectionVariables() {
        return array_merge(
            $this->routes->getScriptInjectionVariables(),
            self::getErrorStore()->getScriptInjectionVariables(),
            [
                'pluginNamespace' => self::PLUGIN_NAMESPACE,
                'snackbarDomNode' => self::SNACKBAR_DOM_NODE,
                'reactDomNode' => self::REACT_DOM_NODE,
            ]
        );
    }