declare namespace Ext {
    export namespace grid {
        export namespace feature {
            export interface RowBodyConfig {
                bodyBefore?: boolean;
                listeners?: object;
            }

            export class RowBody extends Ext.grid.feature.Feature  {
                public getAdditionalData(data?: object, idx?: number, record?: Ext.data.Model, orig?: object): object;
            }
        }
    }
}