declare namespace Ext {
    export namespace data {
        export namespace identifier {
            export interface SequentialConfig {
                id?: string;
                increment?: number;
                prefix?: string;
                seed?: number;
            }

            export class Sequential extends Ext.data.identifier.Generator  {
                public getIncrement(): void;
                public getPrefix(): void;
                public getSeed(): void;
                public setIncrement(): void;
                public setPrefix(): void;
                public setSeed(): void;
            }
        }
    }
}