There is functionality that is just not available while in the browser sandbox, so some flash apps will never work. But I'm happy to see this happening.

WebAssembly not gonna give you access to syscall that are simply not there in the Web API

Text metrics, the graphics engine implemented on top of WebGL/WebGPU does it itself.

Weak references are coming, https://github.com/tc39/proposal-weakrefs

no, I'm talking about this

[0] does support for socket(udp and tcp)? [1] encountered with problem when Porting UDP socket communication c code using emscripten

one example among other, and so you can use WebAssembly all you want you will never be able to implement flash.net.DatagramSocket

[0]: https://github.com/WebAssembly/design/issues/1251 [1]: https://github.com/emscripten-core/emscripten/issues/5196

Yes you can, polyfill using WebSockets.

It would require a server component as gateway, so what.

Preaching to the choir my friend, this is the correct path.