declare namespace Ext {
    export namespace data {
        export namespace validator {
            export interface LengthConfig {
                bothMessage?: string;
                emptyMessage?: string;
                max?: number;
                maxOnlyMessage?: string;
                min?: number;
                minOnlyMessage?: string;
            }

            export class Length extends Ext.data.validator.Bound  {
            }
        }
    }
}