window.addEventListener("unhandledrejection", function (event) {
  console.warn("WARNING: Unhandled promise rejection. Shame on you! Reason: "
               + event.reason);
});

window.addEventListener("rejectionhandled", function (event) {
  console.log("Promise rejected! Reason: " + reason);
});

process.on('unhandledRejection', (reason, p) => {
  console.log('Unhandled Rejection at: Promise', p, 'reason:', reason);
  // application specific logging, throwing an error, or other logic here
});

process.on('rejectionHandled', (p) => {
});