declare namespace Ext {
    export namespace grid {
        export namespace filters {
            export namespace filter {
                export interface TriFilterConfig {
                    active?: boolean;
                    dataIndex?: string;
                    itemDefaults?: object;
                    serializer?: CallableFunction;
                    updateBuffer?: number;
                }

                export class TriFilter extends Ext.grid.filters.filter.Base  {
                }
            }
        }
    }
}