I think what they are really saying is "What needs to happen to allow us to run server-side _style_, module-based JS run in the browser. Basically the point be

I think what they are really saying is "What needs to happen to allow us to run server-side _style_, module-based JS run in the browser. Basically the point being that the browser "version" of JS has a lot of limitations w.r.t dependency resolution and standard library usage, and that by either using a bundling tool or whatever is being proposed here you can avoid those. In that way you end up writing "server-side JS," basically NodeJS style JS, for the browser. Major added benefit is that it allows you to use the same libraries/packages/whatever on both client and server. That's highly convenient.