code: function loadJspmConfig(opts) {
    sh.echo('Loading jspm config...');
  
    return new Promise(resolve => {
      const loader = new jspm.Loader();
  
      opts.config(loader);
      resolve(loader);
    });
  }
docs: Resolve with a module loader.
  
  @param  {{config: function}} opts options
  @return {Promise<jspm.Loader, Error>}