declare namespace Ext {
    export namespace chart {
        export namespace interactions {
            export interface ItemInfoConfig {
                chart?: Ext.chart.AbstractChart;
                enabled?: boolean;
                extjsGestures?: object;
                listeners?: object;
            }

            export class ItemInfo extends Ext.chart.interactions.Abstract  {
                public getExtjsGestures(): void;
                public setExtjsGestures(): void;
            }
        }
    }
}