declare namespace Ext {
    export namespace dd {
        export interface DragTrackerConfig {
            autoStart?: boolean | number;
            constrainTo?: Ext.util.Region | Ext.dom.Element;
            delegate?: string;
            el?: Ext.dom.Element | string;
            listeners?: object;
            overCls?: string;
            preventDefault?: boolean;
            stopEvent?: boolean;
            tolerance?: number;
            trackOver?: boolean;
        }

        export class DragTracker extends Ext.Base  {
            public active?: boolean;
            public dragTarget?: HTMLElement;
            public getDragTarget(): Ext.dom.Element;
            public getOffset(constrainMode?: string): number[];
            public initEl(el?: Ext.dom.Element | string | HTMLElement): void;
            public onBeforeStart(e?: Ext.event.Event): void;
            public onCancel(e?: Ext.event.Event): void;
            public onDrag(e?: Ext.event.Event): void;
            public onEnd(e?: Ext.event.Event): void;
            public onStart(e?: Ext.event.Event): void;
        }
    }
}