ScrollView Scroll event data types

I am using Cocos Creator 3.

I have a scrollview and and I am capturing the scroll events like;

public scrollEvent(sender: any, event: any) {

        console.log(event);

    }

The question I have is what are the data type of sender and event?

@wijesijp Maybe you can refer to this documentation: https://docs.cocos.com/creator/manual/en/components/scrollview.html