import { LightWeightObjectChangeTracker, SetOptions } from '@schoolbelle/common/object-change-tracker';
import { SurveyBaseInterface } from './survey.base.interface';
import { Question } from '../../question';
import { SurveyDataInterface } from './surveyData.interface';
export declare class SurveyBase extends LightWeightObjectChangeTracker implements SurveyBaseInterface {
    protected _questions: {
        [key: string]: Question;
    };
    readonly questions: Question[];
    readonly id: string;
    readonly version: string;
    type: string;
    readonly timestamp: number;
    open_at: number;
    close_at: number;
    readonly created_at: number;
    title: string;
    anonymous: boolean;
    private: boolean;
    readonly value: SurveyDataInterface;
    constructor(survey_id?: string);
    load(data?: Partial<SurveyDataInterface>, options?: SetOptions): void;
}