I don't know what python's async support is like but the biggest issue with porting to the web is the browser mostly requires that you exit events before it wil

I don't know what python's async support is like but the biggest issue with porting to the web is the browser mostly requires that you exit events before it will do anything. This is contrast to pretty much all other environments. That means there are tons of patterns and libraries that just don't work and require major re-writes or big AST manipulations like asyncify from emscripten. I'm not saying you can't do async work in any language. Rather I'm saying that likely the patterns you're used to using in some language that's not JavaScript won't work in the browser and you'll have to massively change your style.