function equal(val1, val2, message) {
  if (val1 !== val2) {
    throw new Error('Not passed: ' + message);
  }
}

// try to import only core
// import Konva from '../';

// // no external shapes
// // equal(Konva.Rect, undefined, 'no external shapes');

// import { Rect } from '../lib/shapes/Rect';

// equal(Rect !== undefined, true, 'Rect is defined');

// equal(Konva.Rect, Rect, 'Rect is injected');

// import Konva2 from '../';

// equal(Konva2.Rect, Rect, 'Rect is injected');

// equal(Konva2, Konva, 'Same Konva');

// // just do a simple action
// const stage = new Konva.Stage();
// stage.toDataURL();