use npm install g2 (version: 3.51 ~ latest); can't find API intervalStack when I use it to draw Pie chart

[meilZhu]

I can write demo of drwaing pie chart in website of g2, but I used npm install it. when implementing the API intervalStack, The console will report an error saying that the API cannot be found.

Error message： view.intervalStack is not a function at eachView.

I have printed chart on the console, and the method is not available on its prototype

[meilZhu]

I read the upgrade guide, which said it had been abandoned. Sorry!