declare namespace Ext {
    export namespace chart {
        export namespace axis {
            export namespace segmenter {
                export interface TimeConfig {
                    axis?: Ext.chart.axis.Axis;
                    step?: object;
                }

                export class Time extends Ext.chart.axis.segmenter.Segmenter  {
                    public getStep(): void;
                    public setStep(): void;
                }
            }
        }
    }
}