declare namespace Ext {
    export namespace layout {
        export namespace container {
            export interface ColumnSplitterTrackerConfig {
                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 ColumnSplitterTracker extends Ext.resizer.SplitterTracker  {
            }
        }
    }
}