Earlier quoted context omitted.
I haven’t done JavaScript in a long while, is using ‘class’ not a favored way of writing JS these days? I wrote JS heavily pre-class, and never really got comfortable using it before switching my focus to other languages.
The poster you're replying to is plain wrong, using "class" is ubiquitously common in the javascript/typescript world, it's the idiomatic way to create classes, and it has better semantics than trying to use prototypes. You might compile away the class keyword for compatibility, though.
But you don't have to do either of those things. There's a third way, with functions and bare objects. I'm not sure that's what GP meant, but a lot of the JS I've written (which tends to be for the browser, mostly vanilla, and quick-and-dirty, to be fair) never touches classes or prototypes. The JSON data being produced/consumed is just a bag of fields, the operations on the document are just top-level functions, events get handled in callback closures, responses to HTTP requests get handled with promises, etc. Sprinkle in some JSDoc comments and you even get fairly workable autocomplete suggestions. Of course, the web APIs are built on prototypes/classes, so it's not like they're totally absent. But with things like data attributes, querySelector, and HTML templates, the usual needs for my own code to be OOP (or even structs-with-methods a la Go/Rust) just don't emerge that much.