Hi folks,
I've created a small PWA metronome to learn LitElement and web-components better(and do not forget RxJS, which I'm not using much at work now).
I've used WebWorker for better timer performance on mobile devices and WebAudio API to generate sound.
Maybe it will be interesting for someone.
If you any suggestions or comments will be very glad to read them.

GitHub: https://github.com/ydubinskyi/rx-metronome
Demo: https://rx-metronome.web.app/