declare namespace Ext {
    export namespace chart {
        export namespace theme {
            export interface DefaultConfig {
                axis?: object;
                background?: any;
                baseColor?: string | Ext.util.Color;
                chart?: object;
                colors?: [];
                gradients?: object;
                legend?: object;
                series?: object;
                sprites?: object;
                useGradients?: any;
            }

            export class Default extends Ext.chart.theme.Base  {
            }
        }
    }
}