ng2-dragula v2的Dom自动滚动用法

Question

我需要添加自动滚动功能，这是我在v2之前（遵循this guide之后）的做法。

// Drag and drop with scroll
this.drake = dragula([], {
    isContainer: (element:any)=>{
        return element.classList.contains('nav-item-title');
    }
    /*
    accepts: function (element, target, source, sibling) {
        return !target.parentNode.classList.contains('nav-link');
    }
    */
});
this.dragService.add('bag', this.drake);

// Copy drake for the autoScroll function
let drake = this.drake;

this.scroll = autoScroll(
    // can also be an array of elements if they're { overflow: auto; max-height: XXpx } containers.
    // i.e. [someViewChild.nativeElement]
    window,
    {
        margin: 60,
        maxSpeed: 25,
        scrollWhenOutside: true,

        autoScroll: function () { // don't use () => {} syntax, we want to keep the 'this'
            // Only scroll when the pointer is down, and there is a child being dragged.
            return this.down && drake.dragging;
        }
    }
);

但是，似乎this.dragService.add('bag', this.drake);在v2中不再起作用。添加方法发生了什么？我该如何解决？