return view.extend({
  load: function() {
    return Promise.all([
      new Promise(function(resolveFn, rejectFn) {
        document.querySelector('head').appendChild(E('script', {
          src: 'blah.js',
          load: resolveFn,
          error: rejectFn
        }));
      }),
      new Promise(function(resolveFn, rejectFn) {
        document.querySelector('head').appendChild(E('script', {
          src: 'blah2.js',
          load: resolveFn,
          error: rejectFn
        }));
      }),
      new Promise(function(resolveFn, rejectFn) {
        document.querySelector('head').appendChild(E('script', {
          src: 'blah3.js',
          load: resolveFn,
          error: rejectFn
        }));
      })
    ]);
  },
  render: function() {
    ...
  }
});