Compiling everything to ES6 modules and then using some TypeScript (or whatever) to glue it all together sounds pretty reasonable to me. TypeScript and Dart ar

Compiling everything to ES6 modules and then using some TypeScript (or whatever) to glue it all together sounds pretty reasonable to me. TypeScript and Dart are decent scripting languages. Even if your "glue code" ends up being tens of thousands of lines it's not a problem. That kind of scale is perfectly doable without too much hair pulling. They were made for this. That's the big plan anyhow. Everything will compile to ES6 modules. I'm sure there will be also some widget libraries, but you don't really need that kind of thing. Modern scripting languages can handle those scripting tasks just fine.