If you want to install JavaScript in VSCode, install Visual Studio Code & Node.JS, create and run a JavaScript program, and then take these steps.

Node.js uses Google's V8 JavaScript engine from Chrome to run and execute JavaScript code outside the browser. SEE: Hiring Kit: Python developer (TechRepublic Premium) ...

But disallowing JavaScript by default and selectively enabling it for specific sites remains a much safer option than letting all sites run JavaScript unrestricted all the time.