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

                export class Base extends Ext.Base  {
                    public active?: boolean;
                    public menu?: Ext.menu.Menu;
                    public type?: string;
                    public constructor(config?: object);
                    public getItemDefaults(): void;
                    public getSerializer(): void;
                    public getUpdateBuffer(): void;
                    public setActive(active?: boolean): void;
                    public setItemDefaults(): void;
                    public setSerializer(): void;
                    public setUpdateBuffer(): void;
                }
            }
        }
    }
}