old_contents: import {SystemJSLoader} from '../src/index';
  
  describe('the system.js loader', () => {
    it('should have some tests', () => {
      var loader = new SystemJSLoader();
      expect(loader).not.toBe(null);
    });
  });
new_contents: import {DefaultLoader} from '../src/index';
  
  describe('the system.js loader', () => {
    it('should have some tests', () => {
      var loader = new DefaultLoader();
      expect(loader).not.toBe(null);
    });
  });
  
subject: fix broken import statement