ha, I've been building a similar system myself recently! If you ever have need of it, I'd strongly recommend upgrading your use of Promises to RxJS Observables

ha, I've been building a similar system myself recently! If you ever have need of it, I'd strongly recommend upgrading your use of Promises to RxJS Observables - this way, you can provide endpoints that emit values multiple times (say, a progress bar on a file upload or a realtime connection) and the UI will update in response.