Trying to Catch up

With covid-19 I am taking time to update my JavaScript skills (which I haven't done for almost (10+) years) so question is what version of JavaScript is supported by roll20 is it 1.5 or 1.8.5  does it support ES5, ES6, or ES7?

It does, at least in the API (sheet workers have a few gaps). I dont know the exact version of Javascript supported, but I had a quick look at feature sets, and it includes at least some features of ES9.

I'll have to check for certain tomorrow, but the sandbox runs a fairly recent version of Node. I'd like to say 14.x, could be 12.x. You should be able to use pretty much the most recent version of Javascript. 

Thank you both, good to know, and as always thank you so much for the support you guys give. it is much appreciated.

GiGs said: It does, at least in the API (sheet workers have a few gaps). I don't know the exact version of JavaScript supported, but I had a quick look at feature sets, and it includes at least some features of ES9. Are these ES9 features also present in sheetworkers? And what known gaps does the sheetworkers have? I updated the Sheet Worker Scripts page to mention that they have access to the underscore library, but it would be great if we could update the documentation to mention what we have access to in sheetworker and the API.

The main failing in sheet workers, is no support for the async features of recent javascript developments. Everything else I've tried has worked.

Sheet workers run in the browser and will depend on what version of javascript the browser supports.  The API Sandbox runs Node v12.16.3