in lib/LocalServer.js [179:187]
LocalServer.getAvailablePort = function (startPort, endPort) {
const port = getRandomInt(startPort, endPort);
return portChecker.check(port)
.then((isInUse) => {
if (!isInUse) return port;
if (startPort < endPort) return LocalServer.getAvailablePort(startPort, endPort);
throw new Error('Unable to find available port');
});
};