Function isURL

lib/internal/url.js:792–794

* Checks if a value has the shape of a WHATWG URL object. * * Using a symbol or instanceof would not be able to recognize URL objects * coming from other implementations (e.g. in Electron), so instead we are * checking some well known properties for a lack of a better test. * * We use `href` a

(self)

 * @returns {self is URL}
 */
function isURL(self) {
  return Boolean(self?.href && self.protocol && self.auth === undefined && self.path === undefined);
}

/**
 * A unique symbol used as a private identifier to safely invoke the URL constructor