It would be kind of nice if you could import modules directly from HTTP sources, like Go. For example:

    import _ from package 'github.com/lodash/lodash/tree/4.8.2';
    import $ from package 'jquery.com/version/2.2.0';

Your browser would make the OOB requests and cache the results in a shared directory, which any JS code that's running locally can use. This way, HTTP requests for 3rd-party components shared across websites aren't repeated over and over again for the same libraries. And it could even be extended to CSS:

    @import package("github.com/twbs/bootstrap/tree/3.3.6");