[zwetan]

> The closest thing we had for ES4, was probably Flash Actionscript 3.

No.

Flash = a browser plugin

ActionScript 3 = a programming language

ActionScript 3 can run in other runtimes than just Flash

Adobe AIR is another runtime, target desktop (Windows, macOS) and mobile (iOS, Android).

Redtamarin is yet another runtime (based on the avmplus) target the command-line and server-side (Windows, macOS, Linux).