const baseUrl 'https://basemapstyles-api.arcgis.com/arcgis/rest/services/styles/v2';
const spec = 'styles';
const style = 'arcgis/navigation';
const apiKey = '<YOUR_API_KEY>';

const styleUrl = `${baseUrl}/${spec}/${style}?token=${apiKey}`;

// Discover +10 compatible SDKs at: links.esri.com/dev/basemaps-v2