how to import other js package

[lilei2333]

Hi. I am trying to make muilti-layer feature so that I can draw a circle and change the label over the initial image. I have found this js package(konvajs: [https://github.com/konvajs/konva]). It has the multi-layer feature. So, I want to import it and change something in the renderer. However, this package is not formed by goog. There doesn't exit "goog.require" or "goog.provide". So, how could I import it?
Thanks a lot.