Just from the headline, this reminds me of Microsoft Windows in the 1990s that came with it's on interpretation of JavaScript (aka "we have implemented some JavaScript like stuff that seems to work like Netscape but in fact doesn't")
In general this sounds pretty cool: GJS is built on the SpiderMonkey JavaScript engine. It utilizes GObject Introspection to provide access to the GNOME APIs using ECMAScript 2021 JavaScript.
Just don't compare it with Node.js; it's something else. No, your code might not run in that environment; APIs are most likely not compatible.
In general this sounds pretty cool: GJS is built on the SpiderMonkey JavaScript engine. It utilizes GObject Introspection to provide access to the GNOME APIs using ECMAScript 2021 JavaScript.
Just don't compare it with Node.js; it's something else. No, your code might not run in that environment; APIs are most likely not compatible.