[barumi]

> Couldn't javascript be just another language to replace bash?

Technically the answer should be "yes", but given the event-driven nature of javascript and a shell script's very specialized design goals (launch processes, control the runtime environment, provide a workable REPL, etc) then it wouldn't be an improvement over any of the current shell scripting languages.

As a general-purpose scripting language... That's an entirely different matter, and the answer is definitely yes. In fact, node.js and deno already do just that.