A proposal not to use the newer language syntax without polyfill, or to protect against exceptions. My Sentry got an error from the Umami script. On Chrome 83, an exception occurred with a missing formal parameter error. I haven't had this happen with tianji yet, but since you're taking a cue from Umami, I'm letting you know that I've had this happen and that you should be careful about supporting only newer browsers.

umami-software/umami#2621