Get a user agent string across all JavaScript Runtime Environments
import { getUserAgent } from "universal-user-agent";
const userAgent = getUserAgent();
// userAgent will look like this
// in browser: "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:61.0) Gecko/20100101 Firefox/61.0"
// in node: Node.js/v8.9.4 (macOS High Sierra; x64)