import { WidgetModel } from '@jupyter-widgets/base';
export declare class BaseModel extends WidgetModel {
    defaults(): {
        _model_name: string;
        _model_module: string;
        _model_module_version: string;
        _view_module: string;
        _view_name: string;
        _view_module_version: string;
        _view_count: number;
    };
    get_date_elem(param: any): Date;
    set_date_elem(param: any, value: any): void;
    convert_to_date(elem: any): Date;
    convert_to_json(elem: any): any;
}
